Anisotropic velocities and offset vector tile prestack-migration processing of the Durham Ranch 3D, Northwest Colorado

Schapper, S.; Jefferson, Ro; Calvert, Alexander; Williams, Marty

doi:10.1190/1.3259614

Cited by 18 publications

(8 citation statements)

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“…Secondly, according to the above method, several cross array gathers are extracted from the observation system of the whole work area, and the OVT vector tiles with the same coordinates are extracted, which are arranged according to the corresponding Inline number and Crossline number to form the OVT gather of the whole area, the OVT gather is a single coverage data volume, similar to a conventional migration data volume. The data volume contains 3D spatial coordinates, offset, azimuth and other information, and is a five dimensional data volume (Williams et al 2002;Scott 2009;Zhan 2018).…”

Section: Wide-azimuth Processing Technologymentioning

confidence: 99%

Wide-Azimuth Seismic Processing Method for Shale Oil Exploration

Zhang

2023

Preprint

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Continental shale oil has become a major replacement area for increasing oil and gas reserves and production in China. Accelerating the research on exploration and development technology of continental shale oil in China is the key to improving shale oil production. Shale oil reservoirs have strong heterogeneity, it is hard to describe the "sweet spots", and higher imaging accuracy is required as well. Therefore, the use of wide-azimuth seismic data to develop research on shale oil reservoir anisotropy and resolution improvement is the key to improve the shale oil reservoirs imaging. In this paper, taking the Y3 study area in the Qijiagulong sag, Songliao Basin, eastern China as an example, by analyzing the wide-azimuth seismic raw data (including static correction, signal-to-noise ratio, frequency, etc.), the targeted processing technology of wide-azimuth data in the study area is determined. Better imaging results have been achieved, the frequency band of the wide azimuth processing section is 11Hz wider than that of the conventional processing section, and the favorable area of "sweet spot" is comprehensively predicted by using the data after wide-azimuth processing.

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Section: Wide-azimuth Processing Technologymentioning

confidence: 99%

Wide-Azimuth Seismic Processing Method for Shale Oil Exploration

Zhang

2023

Preprint

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“…Under these circumstances, azimuthal P-wave gathers will show decreased travel-time in the direction of fractures, faster velocities, and increased travel-time, slower velocities, perpendicular to fractures (Schapper, et al, 2009). The azimuth of fracturing can be determined by looking at the maximum difference between P-fast and P-slow velocities (PP velocity anisotropy).…”

Section: Seismic Anisotropymentioning

confidence: 99%

Multicomponent Surface Seismic, Multicomponent VSP in Reservoir Characterization

Constance¹,

Chi²,

Simmons³

et al. 2015

Unconventional Resources Technology Conference

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A 180 square mile multi-component 3D survey was acquired in Noble, Pawnee and Payne counties, Oklahoma to characterize the Mississippian Lime and Woodford reservoirs for unconventional drilling. The Mississippian Lime is highly fractured, karsted and faulted. The underlying organic Woodford is more homogeneous. Porosities within the Woodford vary across the project area, ranging from 6 to 14 percent.We recorded a comprehensive suite of logs in 5 pilot wells broadly distributed across the 180 square mile project area. We took a conventional core in the George 1-23 SWD well through a complete section of the Mississippi Lime and Woodford Shale and used the results to calibrate our Petrophysical models. We recorded a densely sampled multicomponent 3D Vertical Seismic Profile (3C3DVSP) at the same time as recording the surface 3D seismic. We also recorded 2 Microseismic surveys. One in a lateral landed in the Miss Lime and the second in a lateral landed in the Woodford.The goal for the project was to define the reservoir with well control and then map these reservoir parameters across the project area using surface 3D seismic. The Petrophysical data and downhole seismic (3C3DVSP) were used to calibrate the surface 3D seismic, improving the fidelity and therefore the confidence in the results.

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“…open) and especially if they are filled with fluids. Therefore, under these circumstances, azimuthal gathers will show decreased travel-time in the direction of fractures and increased travel-time perpendicular to fractures (Schapper, et al, 2009). The azimuth of fracturing can thereby be determined and the difference between Vfast and Vslow directions (known as PP velocity anisotropy) is proportional to fracture density (and/or fracture openness).…”

Section: Seismic Anisotropymentioning

confidence: 99%

“…The base data set is a 180 sq mi high density, full azimuth, multi-component survey that was designed, acquired and processed using a VectorSeis Nodal acquisition system (Constance, et al, 2015). Processing was carefully performed in order to quantify compressional and converted wave anisotropy (Schapper, et al, 2009;Simmons, 2009). The last step was a reservoir characterization study that integrated rock and fracture properties with a full suite of calibration data from multiple wells, including vertical and lateral FMI logs, mudlogs, Sonic Scanners, chemical tracer in the laterals, completion results and microseismic data.…”

Section: Introductionmentioning

confidence: 99%

Integration of Microseismic With Rock Properties From Multi-Component Seismic Data, Mississippi Lime Play, North-Central Oklahoma

Singleton¹,

Chi²,

Lapaire³

et al. 2015

Unconventional Resources Technology Conference

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This work consisted of a multi-disciplinary data integration and reservoir characterization of an unconventional limestone and shale reservoir in the US midcontinent region (north-central Oklahoma). The reservoir is the Mississippi Limestone which overlays the organic-rich Woodford Shale. The seismic data set is a 180 sq mi high density, full azimuth, multi-component survey. Processing was carefully performed in order to quantify compressional and converted wave anisotropy. Then a reservoir characterization study was conducted that integrated rock and fracture properties with a full suite of calibration data from multiple wells, including vertical and lateral FMI logs, mudlogs, Sonic Scanners, chemical tracer in the laterals, completion results and microseismic data. This paper describes the results from a portion of this data set, specifically surrounding a vertical saltwater disposal well (George 1-23 SWD) and two laterals (George 23-1H and 23-2H). Along these laterals rock properties change due to an increase in shale in the toe half of the lateral, which in turn causes an increase in ductility. There is also a reduction of fracture density in the toe half of the lateral (as indicted by the lateral FMI), which might be related to the increase in shale. These rock property variations cause an observable change in the characteristics and distribution of microseismic event clusters, with the heel having a larger proportion of small magnitude events.

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Anisotropic velocities and offset vector tile prestack-migration processing of the Durham Ranch 3D, Northwest Colorado

Cited by 18 publications

References 0 publications

Wide-Azimuth Seismic Processing Method for Shale Oil Exploration

Wide-Azimuth Seismic Processing Method for Shale Oil Exploration

Multicomponent Surface Seismic, Multicomponent VSP in Reservoir Characterization

Integration of Microseismic With Rock Properties From Multi-Component Seismic Data, Mississippi Lime Play, North-Central Oklahoma

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