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Journal articles on the topic 'Unconsolidated white sands'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

De, Block Petra, Franck Rakotonasolo, Alexander Vrijdaghs, and Steven Dessein. "Two new species of Phialiphora (Spermacoceae, Rubiaceae) exemplify drought adaptations in western Madagascar." Plant Ecology and Evolution 153, no. (2) (2020): 267–82. https://doi.org/10.5091/plecevo.2020.1675.

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<b>Background</b> – <em>Phialiphora</em> (Spermacoceae, Rubiaceae) is a herbaceous genus restricted to unconsolidated white sands in open spaces in dry forests in northwestern Madagascar. The genus is characterized by the semi-succulent nature of its leaves and stems, its basal leaf rosette, its head-like inflorescences subtended by large leaf-like involucrate bracts and its isostylous flowers. Hitherto, only two species were described.<b>Methods</b> – Classical methods of herbarium taxonomy are followed.<b>Key results</b> – Two new <em>Phialiphora</em> species, <em>P. glabrata</em> De Block a

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De Block, Petra, Franck Rakotonasolo, Alexander Vrijdaghs, and Steven Dessein. "Two new species of Phialiphora (Spermacoceae, Rubiaceae) exemplify drought adaptations in western Madagascar." Plant Ecology and Evolution 153, no. 2 (2020): 267–82. http://dx.doi.org/10.5091/plecevo.2020.1675.

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Background – Phialiphora (Spermacoceae, Rubiaceae) is a herbaceous genus restricted to unconsolidated white sands in open spaces in dry forests in northwestern Madagascar. The genus is characterized by the semi-succulent nature of its leaves and stems, its basal leaf rosette, its head-like inflorescences subtended by large leaf-like involucrate bracts and its isostylous flowers. Hitherto, only two species were described.Methods – Classical methods of herbarium taxonomy are followed.Key results – Two new Phialiphora species, P. glabrata De Block and P. valida De Block, are described, which brin

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Miller, Mark A., and H. J. Ramey. "Effect of Temperature on Oil/Water Relative Permeabilities of Unconsolidated and Consolidated Sands." Society of Petroleum Engineers Journal 25, no. 06 (1985): 945–53. http://dx.doi.org/10.2118/12116-pa.

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Abstract Over the past 20 years, a number of studies have reported temperature effects on two-phase relative permeabilities in porous media. Some of the reported results, however, have been contradictory. Also, observed effects have not been explained in terms of fundamental properties known to govern two-phase flow. The purpose of this study was to attempt to isolate the fundamental properties affecting two-phase relative permeabilities at elevated temperatures. Laboratory dynamic-displacement relative permeability measurements were made on unconsolidated and consolidated sand cores with wate

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Aladejana, Jamiu A., Robert M. Kalin, Philippe Sentenac, and Ibrahim Hassan. "Hydrostratigraphic Characterisation of Shallow Coastal Aquifers of Eastern Dahomey Basin, S/W Nigeria, Using Integrated Hydrogeophysical Approach; Implication for Saltwater Intrusion." Geosciences 10, no. 2 (2020): 65. http://dx.doi.org/10.3390/geosciences10020065.

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This study employed electrical resistivity tomography (ERT) in characterising the shallow groundwater aquifers of Eastern Dahomey basin in southwestern Nigeria to assess the possible occurrence and distribution of saltwater within the aquifers. Electrical resistivity tomography (ERT), induced polarization (IP) and borehole logging were carried in locations with relatively enhanced electrical conductivity (EC) within the coastal zone of the basin through 97 groundwater samples from shallow wells and boreholes; 500 m-length ERT and IP sections were carried out along three traverses A–B, C–D and

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Hornby, Brian E., and William F. Murphy. "Vp/Vs in unconsolidated oil sands: Shear from Stoneley." GEOPHYSICS 52, no. 4 (1987): 502–13. http://dx.doi.org/10.1190/1.1442320.

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The SDT-A sonic tool was tested in a borehole in the Orinoco heavy oil belt, eastern Venezuela. The sonically slow reservoir consists of unconsolidated quartz sand interbedded with shale. Full‐waveform analysis yields both compressional and shear slownesses. We calculated the shear‐wave slowness from the Stoneley slowness; compressional and Stoneley slownesses were determined using modified semblance techniques. The compressional velocity is relatively fast in the heavy oil pay zone compared to the remainder of the well. Heavy oil (8 API) possesses a finite rigidity at sonic frequencies, and t

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Wang, Jiaxian, Yunkai Ji, Changling Liu, et al. "Pore Water Conversion Characteristics during Methane Hydrate Formation: Insights from Low-Field Nuclear Magnetic Resonance (NMR) Measurements." Journal of Marine Science and Engineering 12, no. 4 (2024): 619. http://dx.doi.org/10.3390/jmse12040619.

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Understanding the conversion characteristics of pore water is crucial for investigating the mechanism of hydrate accumulation; however, research in this area remains limited. This study conducted methane hydrate formation experiments in unconsolidated sands using an in-house low-field nuclear magnetic resonance (NMR) system. It focused on pore water conversion characteristics and influencing factors such as initial water saturation and sand particle sizes. Results show that methane hydrate formation enhances the homogeneity of the effective pore structure within sand samples. The conversion ra

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Hagin, Paul N., and Mark D. Zoback. "Viscous deformation of unconsolidated reservoir sands—Part 2: Linear viscoelastic models." GEOPHYSICS 69, no. 3 (2004): 742–51. http://dx.doi.org/10.1190/1.1759460.

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Laboratory creep experiments show that dry unconsolidated reservoir sands follow a power law function of time (at constant stress), and cyclic loading tests (at quasi‐static frequencies of 10−6 to 10−2 Hz) show that the bulk modulus increases by a factor of two with increasing frequency while attenuation remains constant. In this paper, we attempt to model these observations using linear viscoelasticity theory by considering several simple phenomenological models. We investigated two classes of models: spring‐dashpot models, which are represented by exponential functions with a single relaxati

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Neidell, Norman S., and Neal Berry. "Documenting the sand/shale crossover." GEOPHYSICS 54, no. 11 (1989): 1430–34. http://dx.doi.org/10.1190/1.1442606.

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All types of velocity data, i.e., surface seismic and well log or sonic log data, indicate that velocity in shallow, unconsolidated sands is lower than in associated shales, while velocity in older sands in more consolidated rock sequences is higher than in their associated shales. As the low‐velocity sands compact to become the high‐velocity member in the sand‐shale sequence, sand and shale velocities must become equal or crossover at some age and depth of burial. If the same type of velocity data is used consistently, this crossover occurs at the same depth and age of rocks in the geologic s

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Namdie, Inyang, Idara Akpabio, and Agbasi Okechukwu .E. "Shale volume and permeability of the Miocene unconsolidated turbidite sands of Bonga oil field, Niger delta, Nigeria." International Journal of Advanced Geosciences 5, no. 1 (2017): 37. http://dx.doi.org/10.14419/ijag.v5i1.7586.

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Bonga oil field is located 120km (75mi) southeast of the Niger Delta, Nigeria. It is a subsea type development located about 3500ft water depth and has produced over 330 mmstb of hydrocarbon till date with over 16 oil producing and water injection wells. The producing formation is the Middle to Late Miocene unconsolidated turbidite sandstones with lateral and vertical homogeneities in reservoir properties. This work, analysis the petrophysical properties of the reservoir units for the purpose of modeling the effect of shale content on permeability in the reservoir. Turbidite sandstones are ide

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Ghislain Berlin Viban, Ali Gürel, and Honorine Nug. "Facies and depositional sequences of Melendiz Confluence Holocene sediments, Central Anatolia, Turkey." International Journal of Science and Research Archive 12, no. 1 (2024): 2287–307. http://dx.doi.org/10.30574/ijsra.2024.12.1.1013.

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The aim of this article is to investigate the Çiftlik Plain and the Central Anatolia Cappadocia Volcanic Province, the unexplored Quaternary fills, and their climate records. This studies has gained importance as it completes a deficiency in the region.A confluence is where a tributary joins a larger river which depicts an important area of deposition which is an essential geomorphological node that controls the downstream routing of flow and (P2), located between latitudes N38°11' and longitudes E34°27', at an altitude of 1532m above sea level in the Çiftlik Basin. In this Confluence in Çiftl

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Veranis, N., M. Nimfopoulos, C. Christidis, and A. Chrysafi. "GRANULAR AQUIFER SYSTEM OF WEST CHALKIDIKI AREA, REGION OF CENTRAL MACEDONIA, NORTHERN GREECE." Bulletin of the Geological Society of Greece 50, no. 2 (2017): 1016. http://dx.doi.org/10.12681/bgsg.11806.

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The granular aquifer system of the western Chalkidiki peninsula covers an area of 667 Km2 occupying Neogene and Quaternary sediments. The present study deals with the hydrogeological and hydrogeochemical characterization of the granular aquifer system for the purposes of efficient utilization and management of groundwater resources. It is a multilayered formation, composed of unconsolidated to semi-consolidated sands, gravels, conglomerates, sandstones and marly limestones with intercalated impermeable to semi-permeable beds of clays, marls or mixed with pebbles and sands. The aquifer system i

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Arias-Buitrago, Juan Alejandro, Guillermo A. Alzate-Espinosa, Alejandra Arbelaez-Londoño, Gonzalo Zambrano-Narvaez, and Rick Chalaturnyk. "Experimental Study on the Effect of Temperature on the Mechanical Properties of Unconsolidated Silty Sandstones." Energies 14, no. 21 (2021): 7007. http://dx.doi.org/10.3390/en14217007.

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Hydrocarbon reservoirs can be subjected to temperature changes due to different processes during production. Heat injection has become an advantageous method to produce heavy oils in Canada and Venezuela because it increases oil recovery. The heat reduces oil viscosity and oil flows easily. Colombia has significant heavy oil reserves in unconsolidated silty sandstones. It is important to understand the mechanical behavior of these reservoirs in thermal recovery conditions (temperature and effective stress). The reconstituted samples from a Colombian heavy oil outcrop were evaluated using a hig

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Tichelaar, Bart W., and Klaas W. van Luik. "Sonic logging of compressional‐wave velocities in a very slow formation." GEOPHYSICS 60, no. 6 (1995): 1627–33. http://dx.doi.org/10.1190/1.1443895.

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Borehole sonic waveforms are commonly acquired to produce logs of subsurface compressional and shear wave velocities. To this purpose, modern borehole sonic tools are usually equipped with various types of acoustic sources, i.e., monopole and dipole sources. While the dipole source has been specifically developed for measuring shear wave velocities, we found that the dipole source has an advantage over the monopole source when determining compressional wave velocities in a very slow formation consisting of unconsolidated sands with a porosity of about 35% and a shear wave velocity of about 465

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Glover, P. W. J., J. Ruel, E. Tardif, and E. Walker. "Frequency-Dependent Streaming Potential of Porous Media—Part 1: Experimental Approaches and Apparatus Design." International Journal of Geophysics 2012 (2012): 1–15. http://dx.doi.org/10.1155/2012/846204.

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Electrokinetic phenomena link fluid flow and electrical flow in porous and fractured media such that a hydraulic flow will generate an electrical current andvice versa. Such a link is likely to be extremely useful, especially in the development of the electroseismic method. However, surprisingly few experimental measurements have been carried out, particularly as a function of frequency because of their difficulty. Here we have considered six different approaches to make laboratory determinations of the frequency-dependent streaming potential coefficient. In each case, we have analyzed the mec

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Ghislain Berlin Viban and Ali Gürel,Honorine Nug. "Sedimentological depositional features of Imam Hatip, Çiftlik Basin Central Anatolia, Turkey." World Journal of Advanced Research and Reviews 22, no. 3 (2024): 110–26. http://dx.doi.org/10.30574/wjarr.2024.22.3.1677.

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This research seeks to unveil the sedimentological features of Imam Hatip for the first time in this region.Found in the Çiftlik Basin particularly at latitude 38°10'48.15" N and longitude 34°28'9.42" E and about 1535 m above sea level.In this article,Imam Hatip in Çiftlik (IMA-1 to IMA-16) (A-P), consisting of paleosols and terrestrial sediments in which a profile from a collection of 54 specimens was initially examined.This article assesses the depositional patterns of fluvial and lacustrine sediments at Imam Hatip during the Quaternary period. The Quaternary deposits comprise terrestrial se

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Ghislain, Berlin Viban, Gürel Ali, and Nug Honorine. "Sedimentological depositional features of Imam Hatip, Çiftlik Basin Central Anatolia, Turkey." World Journal of Advanced Research and Reviews 22, no. 3 (2024): 110–26. https://doi.org/10.5281/zenodo.14723803.

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This research seeks to unveil the sedimentological features of Imam Hatip for the first time in this region.Found in the Çiftlik Basin particularly at latitude 38°10'48.15" N and longitude 34°28'9.42" E and about 1535 m above sea level.In this article,Imam Hatip in Çiftlik (IMA-1 to IMA-16) (A-P), consisting of paleosols and terrestrial sediments in which a profile from a collection of 54 specimens was initially examined.This article assesses the depositional patterns of fluvial and lacustrine sediments at Imam Hatip during the Quaternary period. The Quaternary deposits c

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Fan, Zhaoqi, Daoyong Yang, and Xiaoli Li. "Quantification of Sand Production Using a Pressure-Gradient-Based Sand-Failure Criterion." SPE Journal 24, no. 03 (2019): 988–1001. http://dx.doi.org/10.2118/185009-pa.

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Summary Cold heavy-oil production with sand (CHOPS) has been one of the major recovery processes for developing unconsolidated heavy-oil reservoirs by taking advantage of sand production and foamy-oil flow. However, effective characterization and accurate prediction of sand production is still a challenge. In this work, a pressure-gradient-based sand-failure criterion is proposed for quantifying sand production and characterizing wormhole propagation. The proposed sand-failure criterion was initially developed at the pore-scale level, while a pseudointeraction force between two neighboring san

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Acosta, Elias R., Aima Mijland, and Bhagwanpersad Nandlal. "Unveiling the Optimal Water Saturation Equation for Unconsolidated Reservoirs: A Case Study From the Tambaredjo Oil Field, Suriname." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 65, no. 5 (2024): 739–64. http://dx.doi.org/10.30632/pjv65n5-2024a5.

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Selecting the optimal water saturation (Sw) equation for reservoir characterization can be an intricate task. Numerous equations exist, each with inherent strengths and limitations. The Tambaredjo Field in Suriname has historically employed the Indonesian equation. While recent research suggests the Modified Indonesian equation, originally developed for Athabasca tar sands, offers a better fit for initial water production in multiple wells, its applicability to the Tambaredjo Field’s unique characteristics (unconsolidated and heavy oil) raises concerns. This study proposes a comprehensive meth

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Loro, Richard, Robin Hill, Mark Jackson, and Tony Slate. "Technologies that have transformed the Exmouth into Australia." APPEA Journal 55, no. 1 (2015): 233. http://dx.doi.org/10.1071/aj14018.

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The oil and gas fields of the Exmouth Sub-basin, offshore WA, have presented a number of significant challenges to their exploitation since the first discoveries of heavy oil and lean gas were made in the late 1980s and early 1990s. Presently, some 20 oil and gas fields have been discovered in a variety of Late Jurassic to Cretaceous clastic reservoirs from slope turbidites to deltaic sands. Discovered oils are typically heavily biodegraded with densities ranging from 14–23° API and moderate viscosity. Seismic imaging is challenging across some areas due to pervasive multiples and gas escape f

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Gal, Doron, Jack Dvorkin, and Amos Nur. "A physical model for porosity reduction in sandstones." GEOPHYSICS 63, no. 2 (1998): 454–59. http://dx.doi.org/10.1190/1.1444346.

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The experimental elastic moduli‐porosity trends for clean sandstones can be described by the modified upper Hashin‐Shtrikman (MUHS) bound. One geometrical (but not necessarily geological) realization is: as porosity decreases, the number of the pores stays the same and each pore shrinks while maintaining its shape. This concept of uniform porosity reduction implies that permeability is proportional to the effective porosity squared, and that formation factor is proportional to the inverse of the effective porosity. The effective porosity here refers to the part of the pore‐space that dominates

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Carpenter, Chris. "Autonomous Inflow-Control Devices Boost Production While Managing Sand." Journal of Petroleum Technology 73, no. 10 (2021): 71–72. http://dx.doi.org/10.2118/1021-0071-jpt.

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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 30403, “Sand Production Management While Increasing Oil Production of a Gravel-Packed Well Equipped With Rate-Controlled-Production Autonomous Inflow-Control Devices in a Thin Heavy-Oil Reservoir Offshore China,” by Shuquan Xiong, Fan Li, and Congda Wei, CNOOC, et al., prepared for the 2020 Offshore Technology Conference Asia, originally scheduled to be held in Kuala Lumpur, 2–6 November. The paper has not been peer reviewed. Copyright 2020 Offshore Technology Conference. Reproduced by permission.

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Patra, Indrajit, William Prasad, and A. Y. Rao. "Grain size variation in sand column along Chhatrapur coast, Ganjam district, Odisha – A clue to the depositional environment." Journal of The Indian Association of Sedimentologists 38, no. 2 (2021): 79–84. http://dx.doi.org/10.51710/jias.v38i2.147.

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The concentration of heavy mineral placer deposits along the coastal tracts are function of various favourable factors i.e. hinterland geological formations, prevalence of favourable climatic condition, their transportation through intricate drainage systems and various coastal processes, which operated during the geological past. Textural analysis of the available unconsolidated sediments from the present deposits is of vital importance to decode the prevailing depositional environment while grain size analysis is the major parameter used. Present study highlights the grain size analysis of t

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Tronicke, Jens, and Hendrik Paasche. "Integrated interpretation of 2D ground-penetrating radar, P-, and S-wave velocity models in terms of petrophysical properties: Assessing uncertainties related to data inversion and petrophysical relations." Interpretation 5, no. 1 (2017): T121—T130. http://dx.doi.org/10.1190/int-2016-0081.1.

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Near-surface geophysical techniques are extensively used in a variety of engineering, environmental, geologic, and hydrologic applications. While many of these applications ask for detailed, quantitative models of selected material properties, geophysical data are increasingly used to estimate such target properties. Typically, this estimation procedure relies on a two-step workflow including (1) the inversion of geophysical data and (2) the petrophysical translation of the inverted parameter models into the target properties. Standard deterministic implementations of such a quantitative inter

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Haryono, Arif, Supriyanto Supriyanto, Djayus Djayus, Mislan Mislan, Piter Lepong, and Asri Yana Pratama Abbas. "STUDY OF SOIL STRATIFICATION IN LANDSLIDE AREAS ON BANTUAS ROAD USING THE RESISTIVITY GEOELECTRIC METHOD." Indonesian Physical Review 7, no. 1 (2024): 133–42. http://dx.doi.org/10.29303/ipr.v7i1.297.

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A landslide is a natural disaster that often occurs in the Palaran sub-district, Samarinda, East Kalimantan. This sub-district with an area of 221.29 km2 is considered strategic as a buffer area for the National Capital City (IKN). Construction of toll roads, ports, factories, and housing has begun to be carried out here. However, in Palaran there are still many roads damaged due to landslides, one of which is Bantuas Road. To study soil stratification on the Bantuas Road section, research has been carried out using the dipole-dipole configuration of the resistivity geoelectric method. The d

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Glover, P. W. J., R. Peng, P. Lorinczi, and B. Di. "Experimental Measurement of Frequency-Dependent Permeability and Streaming Potential of Sandstones." Transport in Porous Media 131, no. 2 (2019): 333–61. http://dx.doi.org/10.1007/s11242-019-01344-5.

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Abstract Hydraulic flow, electrical flow and the passage of elastic waves through porous media are all linked by electrokinetic processes. In its simplest form, the passage of elastic waves through the porous medium causes fluid to flow through that medium and that flow gives rise to an electrical streaming potential and electrical counter-current. These processes are frequency-dependent and governed by coupling coefficients which are themselves frequency-dependent. The link between fluid pressure and fluid flow is described by dynamic permeability, which is characterised by the hydraulic coup

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Moniruzzaman, Md, Jeong-Ho Lee, Kyung Jung, Jang Kwon, Kyoung-Ho Kim, and Seong-Taek Yun. "Lithologic Control of the Hydrochemistry of a Point-Bar Alluvial Aquifer at the Low Reach of the Nakdong River, South Korea: Implications for the Evaluation of Riverbank Filtration Potential." Water 10, no. 12 (2018): 1763. http://dx.doi.org/10.3390/w10121763.

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To assess the groundwater−river water interaction in a point-bar alluvial aquifer as a crucial step in site assessment for riverbank filtration, hydrochemical and hydrogeologic investigations were performed on a riverine island at the low reach of the Nakdong River, South Korea. The site was evaluated for the application of large-scale bank filtration. Unconsolidated sediments (~40 m thick) of the island comprise fine- to medium-grained sand (upper aquifer), silty sand with clay intercalations, and sandy gravel (lower aquifer) in descending order. The intermediate layer represents an impermeab

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Fenies, Hugues, Gilles Lericolais, and Henry W. Posamentier. "Comparison of wave-and tide-dominated incised valleys: specific processes controlling systems tract architecture and reservoir geometry." Bulletin de la Société Géologique de France 181, no. 2 (2010): 171–81. http://dx.doi.org/10.2113/gssgfbull.181.2.171.

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Abstract This paper presents a comparison between the system tract architecture and the reservoir geometries of the Gironde and Leyre (Arcachon) incised-valley fills, both located within the Bay of Biscay 100 km apart. This study, based on high resolution seismic lines acquired by Ifremer on the continental shelf and onshore core and well data, illustrates that some features of the Gironde and Leyre valleys fills are similar while some others are not. The architecture of both valley fills is characterized by fifth order depositional sequences (corresponding to an interval from 120000 yr B.P. t

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Seright, Randall S., J. Mac Seheult, and Todd Talashek. "Injectivity Characteristics of EOR Polymers." SPE Reservoir Evaluation & Engineering 12, no. 05 (2009): 783–92. http://dx.doi.org/10.2118/115142-pa.

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Summary For applications in which enhanced-oil-recovery (EOR) polymer solutions are injected, we estimate injectivity losses (relative to water injectivity) if fractures are not open. We also consider the degree of fracture extension that may occur if fractures are open. Three principal EOR polymer properties are examined that affect injectivity:debris in the polymer,polymer rheology in porous media, andpolymer mechanical degradation. An improved test was developed to measure the tendency of EOR polymers to plug porous media. The new test demonstrated that plugging tendencies varied considerab

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Rieznykova, N. L. "POLISSIAN CATTLE BREED." Animal Breeding and Genetics 63 (August 9, 2022): 191–98. http://dx.doi.org/10.31073/abg.63.18.

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Introduction. According to I. V. Guzev, the National Coordinator on Animal Genetic Resources of Ukraine at the FAO until 2014, 16 domestic breeds and breed groups only from the class of mammals have disappeared in Ukraine. However, quite often even the names of these populations are not known for sure. Disappeared breeds are part of the culture and evolution of the Ukrainian nation, they carried a certain stock of genes, knowledge and traditions. Even the disappearance of knowledge about these breeds will not contribute to the revival of the history of Ukraine and may be an obstacle in underst

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Gogoi, Subrata Borgohain, Pranab Boral, Borkha Mech, Xianfeng Fan, Pradip Borgohain, and Deepjyoti Mech. "Effect of CO2${\rm CO}_2$‐Enhanced Oil Recovery on Wave Velocities in Upper Assam Basin." Greenhouse Gases: Science and Technology, April 21, 2025. https://doi.org/10.1002/ghg.2343.

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AbstractThis study examines the impact of flooding on and wave velocities in the Upper Assam Basin. Laboratory experiments were conducted on 15 consolidated sandstone cores from the Naharkatiya and Rudrasagar reservoirs ( m depth) and one unconsolidated sand pack (lightweight proppant, Houston, USA). Samples, with porosities ranging from 8.03% to 47.00%, were saturated with before injection.Results indicate flooding reduces (compressional velocity, m/s) by 4–11% in consolidated samples and over 25% in the unconsolidated pack, with less pronounced but significant reductions in (shear velocity,

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Al-Rashidi, Hamad, Mahmoud Reda Hussein, Abdulaziz Erhamah, et al. "Mitigating Water Production from High Viscosity Oil Wells in Unconsolidated Sandstone Formations." SPE Production & Operations, July 1, 2022, 1–5. http://dx.doi.org/10.2118/206333-pa.

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Summary Large reserves of high-viscous oil in Kuwait call for improved oil recovery scenarios. In Kuwaiti unconsolidated sandstone formations, the sandstone intervals represent extensive reservoir intervals of sand separated by laterally extensive nonreservoir intervals that comprise finer-grained argillaceous sands, silts, and muds. The reservoir is shallow with high permeability (above 1,000 md) and under bottom aquifer pressure support. Due to strong viscosity contrast between oil and water, after breakthrough, the water cut rises quickly, resulting in strong loss of production efficiency.

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Ejije, C. E., and E. A. Atakpo. "DELINEATION OF SUBSURFACE LITHOLOGY AND AQUIFER STRUCTURES USING ELECTRICAL RESISTIVITY SURVEYS IN PARTS OF UKWUANI LOCAL GOVERNMENT AREA OF DELTA STATE." Nigerian Journal of Science and Environment, April 22, 2025, 61–76. https://doi.org/10.61448/njse231255.

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This study investigates aquifer structures and properties in Ukwuani Local Government Area, Nigeria, using Vertical Electrical Soundings (VES) with Schlumberger and Dipole- Dipole configurations. The Schlumberger were conducted at Obiaruku (VES 1–6), Obinomba (VES 7–12), Umutu (VES 13–15), and Umuaja (VES 16–18), employing an ABEM SAS 1000 Terrameter for data acquisition. Interpretation was done using WinResist for VES and Dipro Software to generate 2D resistivity images, vertical profiles and delineate subsurface formations and aquifer zones in the study area. Near-surface high resistivity va

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"Investigating the Influence of Heavy Oil Recovery by In Situ Combustion during Air Injection as EOR Technique." Journal of Applied and Emerging Sciences, June 25, 2020, 75–84. http://dx.doi.org/10.36785/buitems.jaes.375.

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Heavy oil is one of the most useful energy resources specially in the times of crises when other resources are not present in profusion. However, Occurrence of heavy oil in unconsolidated sands is one the most challenging factor to recover the heavy oil. Therefore, in this study the main focus is derived towards the extraction of heavy oil with optimistic procedure called air injection. For the research, a reactor assembly was developed for the experimental work on air (21% oxygen) injection into heavy oil (12.59 °API) reservoir. Total 13 kinetics runs were conducted on unconsolidated cores by

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A. O, Talabi, Ajayi C. A, Afolagboye L. O, Oyedele A. A, Ojo O. F, and Olofinlade S. W. "Evaluation of Salt-water Intrusion in the Coastal Area of Igbokoda, Southwestern Nigeria." International Journal of Scientific Research and Management 6, no. 01 (2018). http://dx.doi.org/10.18535/ijsrm/v6i1.g01.

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Saltwater intrusion into the coastal aquifer has long been recognized as a major threat to groundwater quality around the world. Groundwater evaluation of salt water intrusions in Igbokoda coastal area, southwestern Nigeria was carried out employing combined Horizontal Profiling and Vertical electrical sounding. Two traverses each with two sounding points were occupied. The result from the survey revealed 4 to 5 major layers comprising the unconsolidated silty sand and sandy clay (overburden), clayey zone, consolidated sand zone, partly intruded salt water intruded sandy clay zone and salt wat

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Durmus, Ufuk. "Rock Physics-Guided Convolutional Neural Network for Elastic Impedance Inversion in Onshore Clastic Reservoirs." Interpretation, March 12, 2025, 1–45. https://doi.org/10.1190/int-2024-0026.1.

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Extracting elastic properties of the subsurface from seismic data and well logs is crucial for reservoir characterization. I utilize the convolutional neural network to obtain elastic properties of the gas-producing reservoirs in the Thrace Basin, Turkey. The Hertz-Mindlin rock physics model for unconsolidated sands is used to create synthetic well logs and synthetic seismic angle gather data as the augmented data set to train the network. Once the training is thoroughly done, the constructed convolutional neural network (CNN) is applied to the 3D onshore field data to predict P-impedance, S-i

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Goswami, U., A. D. Patgiri, and J. N. Sarma. "Hydrogeologic and geomorphic settings of the Lower Subansiri Basin, Assam, India." Journal of Nepal Geological Society 27 (December 1, 2002). http://dx.doi.org/10.3126/jngs.v27i0.31975.

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Geomorphic settings of an area provide valuable supplementary information regarding groundwater recharge, their occurrence and distribution. The geomorphic settings of the Lower Subansiri Basin can broadly be represented by three distinct geomorphic units viz., structural hills, piedmont zone and alluvial plain. While the elevation, slope, lithology, drainage pattern and various relevant morphometric parameters vary from one geomorphic unit to another, the conditions of recharge and discharge, occurrence and distribution of groundwater also differ in different units. The structural hills occup

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