Relevant bibliographies by topics / Reservoir and impedance

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Reservoir and impedance'

Author: Grafiati
Published: 7 June 2025
Last updated: 2 August 2025

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Journal articles on the topic "Reservoir and impedance"

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Zhou, Zhengyun, and Fred J. Hilterman. "A comparison between methods that discriminate fluid content in unconsolidated sandstone reservoirs." GEOPHYSICS 75, no. 1 (2010): B47—B58. http://dx.doi.org/10.1190/1.3253153.

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Three seismic attributes commonly used to predict pore fluid and lithology are the fluid factor [Formula: see text], Poisson impedance (PI), and lambda-rho [Formula: see text]. We evaluated the pore-fluid sensitivity of these attributes with both well-log and seismic data in Tertiary unconsolidated sediments from the Gulf of Mexico where sand and shale are the only expected lithologies. While the sensitivity of one attribute versus another to discriminate pore fluid is often debated in the literature, the sensitivities of the three attributes are not independent but can be traced back to the f
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Ren, Haitao, Gennady Goloshubin, and Fred J. Hilterman. "Poroelastic analysis of permeability effects in thinly layered porous media." GEOPHYSICS 74, no. 6 (2009): N49—N54. http://dx.doi.org/10.1190/1.3223185.

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The mechanism of wave-induced fluid flow, which causes significant attenuation and dispersion of seismic waves in heterogeneous porous media, opens a potential opportunity to estimate fluid-mobility properties from seismic data. However, the permeability effects on seismic data vary for different reservoir environments, so rules of thumb are difficult to establish. Two types of reservoir models were selected. One represents shallow, unconsolidated, low-impedance reservoirs. The other represents deep, consolidated, high-impedance reservoirs. Using analytic equations and wave-propagation numeric
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Candra Teja Kusuma, Md. Shofiqul Islam, Sadiq Jalal, Thais de Souza Kazmierczak, and Luis Antonio Castillo-López. "Reservoir Characterization Using Post Stack Seismic Inversion on The Upper Sihapas Formation, Malacca Strait, Central Sumatra Basin." Frontier Advances in Applied Science and Engineering 2, no. 2 (2024): 109–19. https://doi.org/10.59535/faase.v2i2.342.

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Post-stack seismic inversion is often conducted to quantitatively determine the characteristics of reservoirs using post-stack seismic data, with the output being acoustic impedance. Rock characteristics such as porosity, lithology, and fluids can be represented by impedance values, making the distribution of impedance the focus of this study in determining potential areas of interest. The research area is located in the Malacca Strait Block, Central Sumatra Basin, with the reservoir in the Upper Sihapas Formation. This study uses post-stack seismic inversion with acoustic impedance values ​​a
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Martins, Luiz M. R., and Thomas L. Davis. "From ocean-bottom cable seismic to porosity volume: A prestack PP and PS analysis of a turbidite reservoir, deepwater Campos Basin, Brazil." Interpretation 2, no. 2 (2014): SE91—SE103. http://dx.doi.org/10.1190/int-2013-0150.1.

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The Campos Basin is the best known and most productive of the Brazilian coastal basins. Turbidites are, by far, the main hydrocarbon-bearing reservoirs in the Campos Basin. Using a 4C ocean-bottom cable seismic survey, we set out to improve the reservoir characterization in a deepwater turbidite field in the Campos Basin. To achieve our goal, prestack angle gathers were derived and PP and PS inversion were performed. The inversion was used as an input to predict the petrophysical properties of the reservoir. Converting seismic reflection amplitudes into impedance profiles not only maximizes ve
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Zhang, Lei, Donghui Zhu, and Xuejuan Zhang. "Seismic Attributes Method for Prediction of Unconsolidated Sand Reservoirs of Heavy Oil." Open Fuels & Energy Science Journal 8, no. 1 (2015): 14–18. http://dx.doi.org/10.2174/1876973x01508010014.

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Heavy crude oil is known as oil that is highly viscous and of a higher density than that of conventional oil. Sand reservoirs containing heavy oil generally consist of unconsolidated sediments deposited at a shallow burial depth, with high porosity and permeability. In seismic exploration, acoustic impedance inversion is a commonly used tool in reservoir prediction. However, due to the unconsolidated characteristic of heavy oil reservoirs, the wave impedance difference between heavy oil sandstones and mudstones becomes less apparent, thus limiting the ability of impedance inversion to accurate
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Zhang, Feng, and Xiang-Yang Li. "Exact elastic impedance matrices for transversely isotropic medium." GEOPHYSICS 81, no. 2 (2016): C1—C15. http://dx.doi.org/10.1190/geo2015-0163.1.

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Conventional elastic impedances are derived as scalars by means of the integration of reflectivity. In this sense, they are attributes of the seismic reflection but not the intrinsic physical property of the subsurface media. The derivation of these expressions shares the same assumptions as the reflectivity approximations, such as weak impedance contrast, small angle of incidence, or weak anisotropic media, and thus it limits the accuracy and interpretation capability. The exact P/SV impedance matrices relating the stress and strain represent the mechanical property of the subsurface media an
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Ayman, M. Alghiffari, Sudarmaji Sudarmaji, and Muhammad Destrayuda Trisna. "Petrophysical Analysis and Seismic Attribute for Reservoir Characterization in “AMN” Field, Talang Akar Formation, South Sumatra Basin." Jurnal Penelitian Fisika dan Aplikasinya (JPFA) 14, no. 1 (2024): 1–18. https://doi.org/10.26740/jpfa.v14n1.p1-18.

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The AMN field is located in the South Sumatra Basin, where the Talang Akar Formation is proven to be one of the main hydrocarbon reservoirs in the South Sumatra Basin, with the dominant lithology comprising interbedded sandstone and shale. This study aims to determine the depth and distribution of the reservoirs in the Talang Akar Formation using petrophysical analysis and seismic interpretation. Petrophysical analysis was performed using deterministic methods to obtain reservoir depth information vertically. The seismic interpretation was carried out using model-based acoustic impedance inver
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Aryanto, Muhamad Defi, Darsono Darsono, Julikah Julikah, and Humbang Purba. "RESERVOIR CHARACTERIZATION USING SIMULTANEOUS INVERSION TO DELINEATE HYDROCARBON RESERVOIR." Scientific Contributions Oil and Gas 37, no. 3 (2022): 185–94. http://dx.doi.org/10.29017/scog.37.3.639.

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Reservoir characterization analysis has been carried out for identifying lithology and Àuid content on TalangAkarFormation in South Sumatra Basin. Robust method that being used in this study is the simultaneous inversion which uses pre-stack gather and well log data from Puja A and Puja B. Elastic parameters resulted from simultaneous inversion are P Impedance, S Impedance and V / V ratio. Lambda-Rho parameter (lr) and Mu-Rho (mr) derived from P impedance (I ) and S impedance (I ). Lambda-Rho is sensitive to Àuid content while Mu-Rho to lithology. Area of interest in this study is Talang Akar
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N.O, Ekone, and Dagogo, T. "Well Based Elastic Attribute Analysis for Reservoir Characterization in Ek-field Niger Delta." Journal of Geography, Environment and Earth Science International 28, no. 7 (2024): 60–74. http://dx.doi.org/10.9734/jgeesi/2024/v28i7790.

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Derived elastic attributes has been used to discriminate rock and fluid properties in EK Field using well logs data. These derived rock attributes were analyzed in cross-plot space for target reservoirs. The log analysis for delineated reservoir B20 shows an average volume of shale (7.5%), total porosity (33.9%) and water saturation (29.3%). Cross-plots of elastic rock attributes (Vp/Vs, Lambda-Rho (λρ), Mu-Rho (μρ), Poisson ratio and acoustic impedance) were used as fluid and lithology indicators and in reservoir characterization. The cross plots results shows distinct separation of hydrocarb
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Okeugo, C. G., K. M. Onuoha, and A. C. Ekwe. "Lithology and fluid discrimination using rock physics-based modified upper Hashin–Shtrikman bound: an example from onshore Niger Delta Basin." Journal of Petroleum Exploration and Production Technology 11, no. 2 (2021): 569–78. http://dx.doi.org/10.1007/s13202-020-01073-2.

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AbstractThe Ozifa reservoir is proven reservoir that cuts across the Northern and Greater Ughelli depo-belts of the Niger Delta Basin. This reservoir possesses heterogenous character southward of the field, making elastic properties, lithologies and fluid types difficult to describe accurately. In this study, rock physics template was applied to porosity and acoustic impedance (AI) crossplot clusters to illustrate rock–fluid relationships using modified Hashin–Shtrikman upper bound, Voigt upper bound and Reuss lower bound, as an input in the template. Values of acoustic impedance and porosity
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Dissertations / Theses on the topic "Reservoir and impedance"

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Koudelková, Eva. "Analýza monitorování zemní hráze vodního díla Karolinka." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-391980.

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This diploma thesis deals with the analysis of the monitoring of the Karolinka water reservoir earth dam. For the reason of seepage detected on the downstream face of the dam, the water reservoir was operated in a limited regime practically from its beginning. One of the most significant interventions aimed at reducing them was the installation of a sealing wall realized in 2013. Since 2011, the earth dam has been pilot-monitored by probes of the electrical impedance spectrometry method. The thesis deals with the processing of the data obtained by this method and with the comparison of the det
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Fránková, Hana. "Ověření technologie BioSealing metodou EIS." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265705.

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Diploma thesis is dealing with recognition of Biosealing technology using electrical impedance spektrometry method. BioSealing is an innovative method of soil body reconstruction, which uses stimulation of soil bacterial activity to seal the leakage. The method was developed in the Netherlands and it was used in conditions of the Czech Republic in years 2015 and 2016 on the Hornice water work. This earth dam was monitored by electrical impedance spectrometry by apparatus with device Z-meter IV in this period and the data are processed and assessed in this diploma thesis.
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Králíková, Štěpánka. "Analýza monitorování zemní hráze malé vodní nádrže." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409716.

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The diploma thesis deals with the use of the electrical impedance spectrometry method (EIS) and the devices Z-meter II, Z-meter III and Z-meter VI based on it for the monitoring earth-fill dams of small water reservoirs. The devices were developed in the Laboratory of Water Management Research of the Institute of Water Structures of the Faculty of Civil Engineering of the Brno University of Technology by solving international project of applied research in the EUREKA program. The analysis of monitoring of the dam of the small water reservoir Bezedník III, which is located in the cadastre of th
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Gardavská, Zuzana. "Monitorování filtračních procesů probíhajících v zemních hrázích." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-234539.

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This doctoral thesis with the title „Monitoring of filtration processes in earth dams“ represents possibilities of using electrical impedance spectrometry method (EIS) and devices Z- meter II and Z- meter 2A based on it for using a monitoring earth-fill dikes of small water reservoirs. The devices are developed in the Laboratory of Water Management Research Institute of Water Structures Faculty of Civil Engineering Brno University of Technology through international projects E!3838 and E!4981 in EUREKA program. As part of submitted doctoral thesis the monitoring has been conducted at two locat
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Magoba, Moses. "Investigation of the acoustic impedance variations of the upper shallow marine sandstone reservoirs in the Bredasdorp basin, offshore South Africa." University of the Western Cape, 2019. http://hdl.handle.net/11394/7028.

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Philosophiae Doctor - PhD<br>Investigation of the acoustic impedance variations in the upper shallow marine sandstone reservoirs was extensively studied from 10 selected wells, namely: F-O1, F-O2, E-M4, E-CN1, E-G1, E-W1, F-A10, F-A11, F-A13, and F-L1 in the Bredasdorp Basin, offshore, South Africa. The studied wells were selected randomly across the upper shallow marine interval with the purpose of conducting a regional study to assess the variations in the acoustic impedance across the reservoirs using wireline log and core data. The datasets used in this study were geophysical wireline logs
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Adedeji, Elijah A. "3D Post-stack Seismic Inversion using Global Optimization Techniques: Gulf of Mexico Example." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2231.

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Seismic inversion using a global optimization algorithm is a non-linear, model-driven process. It yields an optimal solution of the cost function – reflectivity/acoustic impedance, when prior information is sparse. The inversion result offers detailed interpretations of thin layers, internal stratigraphy, and lateral continuity and connectivity of sand bodies. This study compared two stable and robust global optimization techniques, Simulated Annealing (SA) and Basis Pursuit Inversion (BPI) as applied to post-stack seismic data from the Gulf of Mexico. Both methods use different routines and c
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Stimpfling, Thomas. "Modified layered double hydroxide (LDH) platelets as corrosion inhibitors reservoirs dispersed into coating for aluminun alloy 2024." Thesis, Clermont-Ferrand 2, 2011. http://www.theses.fr/2011CLF22169.

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L’alliage d’aluminium 2024 est très répandu dans l’industrie aéronautique et automobile. Le processus de corrosion peut entrainer des dommages irréversibles pouvant engendrer des issues fatales dans le domaine aéronautique. Ainsi plusieurs couches de revêtements sont déposées à la surface du métal à protéger pour prévenir le processus de corrosion. Depuis le début du 20ième siècle, le chrome hexavalent (CrVI) a été largement utilisé comme inhibiteur de corrosion dans les différentes couches du revêtement (prétraitement, primer et top-coat). La toxicité de ce composé envers l’homme et l’environ
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Rey, Amaya Alvaro. "Fast History Matching of Time-Lapse Seismic and Production-Data for High Resolution Models." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9691.

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Seismic data have been established as a valuable source of information for the construction of reservoir simulation models, most commonly for determination of the modeled geologic structure, and also for population of static petrophysical properties (e.g. porosity, permeability). More recently, the availability of repeated seismic surveys over the time scale of years (i.e., 4D seismic) has shown promising results for the qualitative determination of changes in fluid phase distributions and pressure required for determination of areas of bypassed oil, swept volumes and pressure maintenance mech
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Book chapters on the topic "Reservoir and impedance"

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Zhang, Yong-gang, Guo-zhang Fan, Hong-ping Wang, et al. "An Extended Elastic Impedance Method and Its Application to Detect Carbonate Reservoir." In Springer Series in Geomechanics and Geoengineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1964-2_33.

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Żyliński, Marek, Małgorzata Wojciechowska, Wiktor Niewiadomski, and Gerard Cybulski. "Compliance of a Cardiovascular System Is Non-linear – Influence on the Relation Between Blood Pressure and an Impedance Cardiography in the Reservoir-Wave Model." In 8th European Medical and Biological Engineering Conference. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-64610-3_32.

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Roy, Amrita, and Rima Chatterjee. "Lithology Identification Using Lithology Impedance in Mumbai Offshore." In Petro-physics and Rock Physics of Carbonate Reservoirs. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-1211-3_8.

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Masaferro, Jose Luis, Ruth Bourne, and Jean Claude Jauffred. "Three-Dimensional Seismic Volume Visualization of Carbonate Reservoirs and Structures." In Seismic Imaging of Carbonate Reservoirs and Systems. American Association of Petroleum Geologists, 2004. https://doi.org/10.1306/m81928c1.

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Abstract In pure carbonate systems, the combined effect of variations in depositional facies and diagenetic alterations plays a key role in controlling variations in sonic velocities and thus in acoustic impedance. As seismic facies are delineated by acoustic impedance contrasts, depositional facies and geometries may be rather poorly defined for various carbonates environments (e.g., shallow-water platform carbonates). Accurate three-dimensional imaging of seismic facies and geometries is critical to construct a realistic, seismically constrained reservoir model. Conventional two- and three-d
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Tinker, Scott W., Donald H. Caldwell, Denise M. Cox, Laura C. Zahm, and Lisë Brinton. "Integrated Reservoir Characterization of a Carbonate Ramp Reservoir, South Dagger Draw Field, New Mexico." In Seismic Imaging of Carbonate Reservoirs and Systems. American Association of Petroleum Geologists, 2004. https://doi.org/10.1306/m81928c4.

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Abstract South Dagger Draw (SDD) field, located in southeast New Mexico, produces hydrocarbons from complex sigmoid-oblique clinoforms of the Pennsylvanian Canyon and Cisco Formations. South Dagger Draw field, a combination structuralstratigraphic trap, represents the northern extension of the Indian Basin field. Through February 2001, the Indian Basin and SDD fields together had produced nearly 23 million bbl of oil and 2 tcf of gas from Marathon Oil Company-held acreage. Vuggy porosity, formed dominantly in algal biostromes and bioherms located at the rampmargin position of each clinoform, r
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Neuhaus, Dietmar, Jean Borgomano, Jean-Claude Jauffred, Christophe Mercadier, Sam Olotu, and Jürgen Grötsch. "Quantitative Seismic Reservoir Characterization of an Oligocene–Miocene Carbonate Buildup." In Seismic Imaging of Carbonate Reservoirs and Systems. American Association of Petroleum Geologists, 2004. https://doi.org/10.1306/m81928c8.

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Abstract The complex reservoir architecture of the Malampaya carbonate buildup offshore Palawan, Philippines, was initially controlled by a rugged clastic basement morphology, which was overgrown by atoll structures during the Oligocene and early Miocene. Additional factors with major impact on reservoir quality are frequent and high-amplitude relative sea level fluctuations, ocean currents, and prevailing wind directions. Primary depositional reservoir-quality distribution has been overprinted by diagenetic events, primarily as a result of repeated platform-top exposure and submarine cementat
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Moiola, Richard J., Joann E. Welton, John B. Wagner, et al. "Integrated Analysis of the Upper Ferron Deltaic Complex, Southern Castle Valley, Utah." In Regional to Wellbore Analog for Fluvial-Deltaic Reservoir Modeling. American Association of Petroleum Geologists, 2004. https://doi.org/10.1306/st50983c4.

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Abstract The Upper Ferron Sandstone in southern Castle Valley, Utah, is a river-dominated deltaic complex made up of seaward-stepping, vertically stacked, and landward-stepping cycles. These cycles, which consist of delta plain, delta front, and prodelta/offshore facies associations, are partitioned by flooding surfaces that detailed biostratigraphic analysis indicates lack an open marine signature. They are thought to be abandonment flooding surfaces associated with delta lobe switching. The abundance of distributary channel belts associated with all cycles suggests that riverine processes co
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"Utility of Using Acoustic Impedance Data in the Stochastic Modeling of a Carbonate Reservoir." In Stochastic Modeling and Geostatistics. American Association of Petroleum Geologists, 2006. http://dx.doi.org/10.1306/1063820ca53239.

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Magee, Patrick, and Mark Tooley. "Gas pressure, Volume and Flow Measurement." In The Physics, Clinical Measurement and Equipment of Anaesthetic Practice for the FRCA. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199595150.003.0018.

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The physics of pressure, flow and the gas laws have been discussed in Chapter 7 in relation to the behaviour of gas and vapour. This section will focus on the physical principles of the measurement of gas pressure, volume and flow. Unlike a liquid, a gas is compressible and the relationship between pressure, volume and flow depends on the resistance to gas flow (or impedance if there is a frequency dependence between pressure and flow in alternating flow, see Chapter 4 for the electrical analogy of this) in conduits (bronchi, anaesthetic tubing); it also depends on the compliance of structures
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Eberli, Gregor P., Flavio S. Anselmetti, Christian Betzler, Jan-Henk Van Konijnenburg, and Daniel Bernoulli. "Carbonate Platform to Basin Transitions on Seismic Data and in Outcrops." In Seismic Imaging of Carbonate Reservoirs and Systems. American Association of Petroleum Geologists, 2004. https://doi.org/10.1306/m81928c10.

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Abstract The comparison of seismic and core data from the western Great Bahama Bank with the exhumed Maiella Platform margin and its adjacent slope in the Apennines of Italy relates the seismic facies to depositional facies and processes. Both platforms evolved similarly from an escarpment-bounded, aggrading platform in the Cretaceous to a prograding platform in the Tertiary. This comparison helps to improve seismic interpretation of isolated carbonate platform systems. Platform interior deposits are typically horizontally layered cycles of shallow-water carbonates, but the seismic sections fr
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Conference papers on the topic "Reservoir and impedance"

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I. Malureanu, Ion. "USING ACOUSTIC IMPEDANCE IN RESERVOIR CHARACTERIZATION." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/14/s06.125.

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R. Weathers, L. "Reservoir Description Using Acoustic Impedance - Hallettsville 3D." In EAGE Winter Symposium - Reservoir Geophysics, the Road Ahead. European Association of Geoscientists & Engineers, 1996. http://dx.doi.org/10.3997/2214-4609.201406861.

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Kemper, M. A. C., and J. Gunning. "Rock Physics Driven Joint Impedance and Seismic Inversion." In Seismic Driven Reservoir Characterization and Production Management. EAGE Publications BV, 2015. http://dx.doi.org/10.3997/2214-4609.201412312.

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Oifoghe, Stanley, Ikenna Obodozie, and Lucrecia Grigoletto. "Application of Acoustic Impedance and Reflectivity in Reservoir Characterization." In SPE Nigeria Annual International Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/207077-ms.

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Abstract Well log analysis is one of the methods for reservoir characterization, in the oil and gas industry. Logs are used for subsurface formation evaluation. They are useful in hydrocarbon zone identification and volume calculation. Interpretation of well log involves sequential steps, which are lithology, shale volume, porosity and saturation determination. It is unwise to analyze well log without following the logical steps, as this could introduce errors in the result. Petrophysical and Geomechanical properties are two classes of properties for reservoir characterization. The computed vo
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Khan, M., A. A. Bery, S. S. Ali, S. Awfi, and Y. Bashir. "Unlocking Reservoir Potential: Machine Learning-Driven Prediction of Reservoir Properties and Sweet Spots Identification." In International Petroleum Technology Conference. IPTC, 2024. http://dx.doi.org/10.2523/iptc-23557-ms.

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Abstract Reservoir properties prediction and sweet spots identification from seismic and well data is an essential process of hydrocarbon exploration and production. This study aims to develop a robust and reliable approach to predict reservoir properties such as acoustic impedance and porosity of a fluvio-deltaic depositional system from 3D seismic and well data using Machine Learning techniques and compare the results with conventional stochastic inversion. A comprehensive machine learning methodology has been applied to predict reservoir properties in both log-to-log and log-to-seismic doma
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Kumar, A., Z. Harith, K. Kamaruddin, A. Mohd Ramli, and A. Kolupaev. "Lithology Impedance Attribute to Identify LRLC Zone Based on Well Log." In Seismic Driven Reservoir Characterization and Production Management. EAGE Publications BV, 2015. http://dx.doi.org/10.3997/2214-4609.201412293.

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Shrestha, R. K., and M. Boeckmann. "High-Resolution 3D Impedance Data for Reservoir Modeling." In 64th EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 2002. http://dx.doi.org/10.3997/2214-4609-pdb.5.h037.

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Prasad”, Manika, and Murli H. Manghnani. "Velocity and impedance microstructural anisotropy in reservoir rocks." In SEG Technical Program Expanded Abstracts 1996. Society of Exploration Geophysicists, 1996. http://dx.doi.org/10.1190/1.1826500.

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Weathers, Lloyd R. "Reservoir description using acoustic impedance ‐ Hallettsville 3‐D." In SEG Technical Program Expanded Abstracts 1996. Society of Exploration Geophysicists, 1996. http://dx.doi.org/10.1190/1.1826762.

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Han, Linghe, Kun Xiang, and Evgeny Landa. "Impedance inversion of the karst reservoir using diffraction." In SEG Technical Program Expanded Abstracts 2019. Society of Exploration Geophysicists, 2019. http://dx.doi.org/10.1190/segam2019-3205671.1.

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Reports on the topic "Reservoir and impedance"

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Murphy, Hugh D., and Mark Malzahn. Reservoir impedances before and after redrilling. Office of Scientific and Technical Information (OSTI), 1987. http://dx.doi.org/10.2172/1244401.

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