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GEOREF RECORD

Poststack, prestack, and joint inversion of P- and S-wave data for Morrow A sandstone characterization

Paritosh Singh, Thomas L. Davis and Bryan DeVault
Poststack, prestack, and joint inversion of P- and S-wave data for Morrow A sandstone characterization (in Earth model; effective interpretation for conventional and unconventional reservoirs, Carmen C. Dumitrescu (prefacer), Andreas Laake (prefacer) and Konstantin Osypov (prefacer))
Interpretation (Tulsa) (August 2015) 3 (3): SZ59-SZ92

Abstract

Exploration for oil-bearing Morrow sandstones using conventional seismic data/methods has a startlingly low success rate of only 3%. The S-wave velocity contrast between the Morrow shale and A sandstone is strong compared with the P-wave velocity contrast, and, therefore, multicomponent seismic data could help to characterize these reservoirs. The SV and SH data used in this study are generated using S-wave data from horizontal source and horizontal receiver recording. Prestack P- and S-wave inversions, and joint P- and S-wave inversions, provide estimates of P- and S-wave impedances, and density for characterization of the Morrow A sandstone. Due to the weak P-wave amplitude-versus-angle response at the Morrow A sandstone top, the density and S-wave impedance estimated from joint P- and S-wave inversions were inferior to the prestack S-wave inversion. The inversion results were compared with the Morrow A sandstone thickness and density maps obtained from well logs to select the final impedance and density volume for interpretation. The P-wave impedance estimated from prestack P-wave data, as well as density and S-wave impedance estimated from prestack SV-wave data were used to identify the distribution, thickness, quality, and porosity of the Morrow A sandstone. The stratal slicing method was used to get the P- and S-wave impedances and density maps. The S-wave impedance characterizes the Morrow A sandstone distribution better than the P-wave impedance throughout the study area. Density estimation from prestack inversion of SV data was able to distinguish between low- and high-quality reservoirs. The porosity volume was estimated from the density obtained from prestack SV-wave inversion. We found some possible well locations based on the interpretation.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 3
Serial Issue: 3
Title: Poststack, prestack, and joint inversion of P- and S-wave data for Morrow A sandstone characterization
Title: Earth model; effective interpretation for conventional and unconventional reservoirs
Author(s): Singh, ParitoshDavis, Thomas L.DeVault, Bryan
Author(s): Dumitrescu, Carmen C.prefacer
Author(s): Laake, Andreasprefacer
Author(s): Osypov, Konstantinprefacer
Affiliation: Colorado School of Mines, Golden, CO, United States
Affiliation: Terra-IQ, Calgary, AB, Canada
Pages: SZ59-SZ92
Published: 201508
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 45
Accession Number: 2016-006931
Categories: Economic geology, geology of energy sourcesApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. chart, sects., 7 tables, sketch maps
N36°30'00" - N37°00'00", W102°01'60" - W100°55'00"
Secondary Affiliation: Schlumberger, USA, United StatesChevron, USA, United StatesVecta Oil and Gas, USA, United States
Source Note: Online First
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201604
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