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Articles de revues sur le sujet « Wave Equation Datuming »

Auteur : Grafiati

Publié le 11 mars 2023

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1

Gong, Xufei, Qizhen Du, Qiang Zhao, Pengyuan Sun, Jianlei Zhang, and Zhenping Tian. "Elastic wave-equation datuming." GEOPHYSICS 83, no. 5 (2018): U51—U61. http://dx.doi.org/10.1190/geo2017-0672.1.

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Wave-equation datuming (WED) techniques have demonstrated superiority when waves occur on the acquisition surface nonvertically, and traditional static corrections based on the time shift become inaccurate. Meanwhile, as for multicomponent data, those scalar techniques can hardly maintain the vector characteristics for the following multicomponent data processing flows. Considering this, we have developed an elastic-wave datuming approach to handle the static corrections for multicomponent data. Different from those existing scalar WED techniques, the multicomponent data are first decomposed i

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Bevc, Dimitri. "Flooding the topography: Wave‐equation datuming of land data with rugged acquisition topography." GEOPHYSICS 62, no. 5 (1997): 1558–69. http://dx.doi.org/10.1190/1.1444258.

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Wave‐equation datuming overcomes some of the problems that seismic data recorded on rugged surface topography present in routine image processing. The main problems are that (1) standard, optimized migration and processing algorithms assume data are recorded on a flat surface, and that (2) the static correction applied routinely to compensate for topography is inaccurate for waves that do not propagate vertically. Wave‐based processes such as stacking, dip‐moveout correction, normal‐moveout correction, velocity analysis, and migration after static shift can be severely affected by the nonhyper

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3

Schneider, William A., Lindy D. Phillip, and Ernest F. Paal. "Wave‐equation velocity replacement of the low‐velocity layer for overthrust‐belt data." GEOPHYSICS 60, no. 2 (1995): 573–79. http://dx.doi.org/10.1190/1.1443795.

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Seismic land data are commonly plagued by nonhyperbolic distortions induced by a variable near‐surface, low‐velocity layer (LVL). First‐arrival refraction analysis is conventionally employed to estimate the LVL geometry and velocities. Then vertical static time shifts are used to replace the LVL velocities with the more uniform, faster velocities that characterize the underlying refracting layer. This methodology has earned a good reputation as a geophysical data processing tool; however, velocity replacement with static shifts assumes that no ray bending occurred at the LVL base and that wave

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4

Beresford, G., and C. Hurst. "Wave-Equation Datuming on a Micro-Computer." Exploration Geophysics 22, no. 1 (1991): 41–44. http://dx.doi.org/10.1071/eg991041.

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5

Yang, Kai, Yu-Zhu Liu, Jian-Hua Geng, and Zai-Tian Ma. "Upward continuation with topographic datuming operator: the integrated wave equation datuming scheme revised." Geophysical Prospecting 57, no. 6 (2009): 943–56. http://dx.doi.org/10.1111/j.1365-2478.2009.00790.x.

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6

Tinivella, U., M. Giustiniani, and R. Nicolich. "Wave equation datuming applied to S-wave reflection seismic data." Journal of Applied Geophysics 152 (May 2018): 167–72. http://dx.doi.org/10.1016/j.jappgeo.2018.03.015.

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7

Liu, Wenge, Bo Zhao, Hua-wei Zhou, Zhenhua He, Hui Liu, and Zengli Du. "Wave-equation global datuming based on the double square root operator." GEOPHYSICS 76, no. 3 (2011): U35—U43. http://dx.doi.org/10.1190/1.3555076.

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Current schemes for removing near-surface effects in seismic data processing use either static corrections or wave-equation datuming (WED). In the presence of rough topography and strong lateral velocity variations in the near surface, the WED scheme is the only option available. However, the traditional procedure of WED downward continues the sources and receivers in different domains. A new wave-equation global-datuming method is based on the double-square-root operator, implementing the wavefield continuation in a single domain following the survey sinking concept. This method has fewer app

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8

Larkin, Steven P., and Alan Levander. "Wave-equation datuming for improving deep crustal seismic images." Tectonophysics 264, no. 1-4 (1996): 371–79. http://dx.doi.org/10.1016/s0040-1951(96)00137-0.

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Reshef, Moshe. "Depth migration from irregular surfaces with depth extrapolation methods." GEOPHYSICS 56, no. 1 (1991): 119–22. http://dx.doi.org/10.1190/1.1442947.

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Nonflat surface topography introduces a numerical problem for migration algorithms that are based on depth extrapolation. Since the numerically efficient migration schemes start at a flat interface, wave‐equation datuming is required (Berryhill, 1979) prior to the migration. The computationally expensive datuming procedure is often replaced by a simple time shift for the elevation to datum correction. For nonvertically traveling energy this correction is inaccurate. Subsequent migration wrongly positions the reflectors in depth.

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10

Berryhill, John R. "Submarine canyons: Velocity replacement by wave‐equation datuming before stack." GEOPHYSICS 51, no. 8 (1986): 1572–79. http://dx.doi.org/10.1190/1.1442207.

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Submarine canyons incised into the continental slope interfere with the quality of common‐midpoint (CMP) stacked seismic data obtainable from reflectors beneath the sea floor. The interference problem is caused by rough topography in conjunction with the contrast between the acoustic velocity of sea water and the velocity of the exposed rock layers. Geophysicists have long recognized that part of the solution is to replace the traveltimes of raypaths through the water by their traveltimes through an identical thickness of rock. However, use of wave‐equation datuming to effect velocity replacem

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11

Yang, Kai, Hong-Ming Zheng, Li Wang, et al. "Application of an integrated wave-equation datuming scheme to overthrust data: A case history from the Chinese foothills." GEOPHYSICS 74, no. 5 (2009): B153—B165. http://dx.doi.org/10.1190/1.3174393.

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An integrated wave-equation datuming scheme improves the imaging quality of seismic data from overthrust areas. It can be regarded as integrated because upward-layer replacement is included. In this scheme, data are downward continued to a nonplanar datum (such as the base of the weathering layer), followed by upward continuation from the nonplanar datum to a final planar datum using a one-way extrapolator. When compared with a Kirchhoff integral, this method can deal better with the strong lateral velocity variation within the near surface. After a test on synthetic data, the scheme is applie

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12

Lubis, Muhammad Husni Mubarak. "The Application of Wave – Equation Datuming to 3D VSP Processing." Jurnal Geofisika 18, no. 2 (2020): 60. http://dx.doi.org/10.36435/jgf.v18i2.455.

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Abstrak Vertical Seismic Profile (VSP) memperluas aplikasi seismik lubang bor dari hubungan 1D antara waktu-kecepatan hingga citra 2D atau 3D di sekitar lubang bor. Citra seismik yang dihasilkan dari VSP diharapkan memiliki resolusi vertikal yang lebih tinggi dari data seismik permukaan karena gelombang seismik direkam di dalam lubang bor. Namun, pengolahan data VSP 2D dan 3D memiliki tantangan karena sifat asimetri dari penjalaran gelombang membatasi untuk diterapkannya pengolahan data berbasis Common Mid Point (CMP) seperti analisis kecepatan, Normal Moveout (NMO), dan koreksi statik.

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13

Zhu, Xianhuai, Burke G. Angstman, and David P. Sixta. "Overthrust imaging with tomo‐datuming: A case study." GEOPHYSICS 63, no. 1 (1998): 25–38. http://dx.doi.org/10.1190/1.1444319.

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Through the use of iterative turning‐ray tomography followed by wave‐equation datuming (or tomo‐datuming) and prestack depth migration, we generate accurate prestack images of seismic data in overthrust areas containing both highly variable near‐surface velocities and rough topography. In tomo‐datuming, we downward continue shot records from the topography to a horizontal datum using velocities estimated from tomography. Turning‐ray tomography often provides a more accurate near‐surface velocity model than that from refraction statics. The main advantage of tomo‐datuming over tomo‐statics (tom

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14

YANG, Kai, Jiu-Bing CHENG, Yu-Zhu LIU, Hong-Ming ZHENG, Wei-Ping XUE, and Yang SONG. "A Study on the Application of the 3-D Wave-Equation-Datuming." Chinese Journal of Geophysics 50, no. 4 (2007): 1067–76. http://dx.doi.org/10.1002/cjg2.1124.

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15

Alkhalifah, Tariq, and Claudio Bagaini. "Straight-rays redatuming: A fast and robust alternative to wave-equation-based datuming." GEOPHYSICS 71, no. 3 (2006): U37—U46. http://dx.doi.org/10.1190/1.2196032.

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Wave-equation-based redatuming is expensive and requires a detailed knowledge of the shallow velocity field. We derive the analytical expression of a new prestack wavefield extrapolation operator, the Topographic Datuming Operator (TDO), which applies redatuming based on straight-rays approximation above and below a chosen datum. This redatuming operator is directly applied to common-source gathers to downward continue the source and the receivers, simultaneously, to the datum level without resorting to common-receiver gathers. As a result, the method is far more efficient and robust than the

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16

Dong, Shuqian, Yi Luo, Xiang Xiao, Sergio Chávez-Pérez, and Gerard T. Schuster. "Fast 3D target-oriented reverse-time datuming." GEOPHYSICS 74, no. 6 (2009): WCA141—WCA151. http://dx.doi.org/10.1190/1.3261746.

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Imaging of subsalt sediments is a challenge for traditional migration methods such as Kirchhoff and one-way wave-equation migration. Consequently, the more accurate two-way method of reverse-time migration (RTM) is preferred for subsalt imaging, but its use can be limited by high computation cost. To overcome this problem, a 3D target-oriented reverse-time datuming (RTD) method is presented, which can generate redatumed data economically in target areas beneath complex structures such as salt domes. The redatumed data in the target area then can be migrated inexpensively using a traditional mi

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17

Martini, Francesca, and Christopher J. Bean. "Interface scattering versus body scattering in subbasalt imaging and application of prestack wave equation datuming." GEOPHYSICS 67, no. 5 (2002): 1593–601. http://dx.doi.org/10.1190/1.1512750.

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The presence of high‐velocity, highly heterogeneous layers such as basalt have a detrimental effect on imaging below those structures. Internal characteristics of the basalt itself can also degrade the subbasalt image quality. In many cases the boundary surfaces of a basalt sequence are not smooth but contain some roughness at a scale similar to the seismic wavelength. Interface scattering resulting from interface roughness can be a serious problem. In this paper, body and interface scattering problems are addressed through acoustic finite‐difference modeling. Interface scattering seems to hav

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18

Bean, Christopher J., and Francesca Martini. "Sub-basalt seismic imaging using optical-to-acoustic model building and wave equation datuming processing." Marine and Petroleum Geology 27, no. 2 (2010): 555–62. http://dx.doi.org/10.1016/j.marpetgeo.2009.09.007.

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19

Barison, Erika, Giuseppe Brancatelli, Rinaldo Nicolich, Flavio Accaino, Michela Giustiniani, and Umberta Tinivella. "Wave equation datuming applied to marine OBS data and to land high resolution seismic profiling." Journal of Applied Geophysics 73, no. 3 (2011): 267–77. http://dx.doi.org/10.1016/j.jappgeo.2011.01.009.

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20

Tinivella, Umberta, Michela Giustiniani, and Ivan Vargas-Cordero. "Wave Equation Datuming Applied to Seismic Data in Shallow Water Environment and Post-Critical Water Bottom Reflection." Energies 10, no. 9 (2017): 1414. http://dx.doi.org/10.3390/en10091414.

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21

Wang, Bin, Volker Dirks, Patrice Guillaume, François Audebert, and Duryodhan Epili. "A 3D subsalt tomography based on wave-equation migration-perturbation scans." GEOPHYSICS 71, no. 2 (2006): E1—E6. http://dx.doi.org/10.1190/1.2187720.

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We have developed a simple but practical methodology for updating subsalt velocities using wave-equation, migration-perturbation scans. For the sake of economy and scalability (with respect to full source-receiver migration) and accuracy (with respect to common-azimuth migration), we use shot-profile, wave-equation migration. As input for subsalt-velocity analysis, we provide wave-equation migration scans with velocity scanning limited to the subsalt sediments. Throughout the migration-scan sections, we look for the best focusing or structural positioning of characteristic seismic events. The

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22

Bevc, Dimitri. "Imaging complex structures with semirecursive Kirchhoff migration." GEOPHYSICS 62, no. 2 (1997): 577–88. http://dx.doi.org/10.1190/1.1444167.

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I present a semirecursive Kirchhoff migration algorithm that is capable of obtaining accurate images of complex structures by combining wave‐equation datuming and Kirchhoff migration. The method is successful because breaking up the complex velocity structure into small depth regions allows traveltimes to be calculated in regions where the computation is well‐behaved and where the computation corresponds to energetic arrivals. The traveltimes computed in such a region are used first for imaging and second for downward continuation of the entire survey (shots and receivers) to the boundary of t

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23

Carroll, Steven, and Greg Beresford. "Combining reflection tomography with layer replacement for velocity analysis of near‐surface reefs." GEOPHYSICS 61, no. 2 (1996): 561–69. http://dx.doi.org/10.1190/1.1443982.

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Reefs in the Browse Basin on the Australian North West Shelf typically have strong lateral velocity inhomogeneity on the reef flanks and produce an irregular sea‐floor topography. The combination of these two factors reduces the effectiveness of conventional velocity analysis as moveout on common midpoint (CMP) gathers is no longer hyperbolic. Consequently, the velocity structure on the reef flanks cannot be resolved properly. An accurate velocity structure is needed for these reefs if seismic data acquired in the vicinity are to be migrated correctly. Tomographic velocity analysis, using a si

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24

Beasley, Craig, and Walt Lynn. "The zero‐velocity layer: Migration from irregular surfaces." GEOPHYSICS 57, no. 11 (1992): 1435–43. http://dx.doi.org/10.1190/1.1443211.

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Seismic data acquired in areas with irregular topography are usually corrected to a flat datum before migration. A time‐honored technique for handling elevation changes is to time shift the data before application of migration. This simple time shift, or elevation‐static correction, cannot properly represent wide‐angle or dipping reflections as they would have been recorded at the datum. As a result, when elevation varies significantly, accuracy in event positioning may be compromised for migration and other wave‐equation processes, such as dip moveout processing (DMO). Traditionally, such ove

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25

Mazzotti, Alfredo P., Eusebio Stucchi, Gian Luigi Fradelizio, Luigi Zanzi, and Paolo Scandone. "Seismic exploration in complex terrains: A processing experience in the Southern Apennines." GEOPHYSICS 65, no. 5 (2000): 1402–17. http://dx.doi.org/10.1190/1.1444830.

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We discuss a data‐processing sequence adopted to reprocess a seismic line that crosses the Italian southern Apennines from the Tyrrhenian Sea to the Adriatic margin and investigate both the overthrust and foreland areas. We first determine the main causes of the very low S/N ratio in the field data and then propose a processing sequence aimed at exploiting the signal content, also making use of a priori geological knowledge of this area. Our work indicates a combination of causes for the very low quality of the seismic data. These include length of the spread (about 20 km) that is unfavorable

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Giustiniani, M., U. Tinivella, S. Parolai, F. Donda, G. Brancolini, and V. Volpi. "Integrated Geophysical Analyses of Shallow-Water Seismic Imaging With Scholte Wave Inversion: The Northern Adriatic Sea Case Study." Frontiers in Earth Science 8 (November 25, 2020). http://dx.doi.org/10.3389/feart.2020.587898.

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The integrated analysis using different seismic wave types in a record is a very efficient approach for a comprehensive characterization of marine sediments, especially in shallow water conditions. The proposed integrated method to analyze seismic data in post-critical conditions consists of: 1) the inversion of Scholte waves to obtain a reliable Vs distribution of the near seafloor; 2) pre-processing of seismic data; 3) construction of the P-wave velocity field by using all available information, including available well data; and 4) the application of the wave equation datuming and post-proc

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27

"Technical article: Application of pre-stack wave equation datuming to remove interface scattering in sub-basalt imaging." First Break 20, no. 6 (2002): 395–403. http://dx.doi.org/10.1046/j.1365-2397.2002.00282.x.

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