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Interpretation of multicomponent seismic data across Wister geothermal field, Imperial Valley, California

Wei Shuijian, Michael V. DeAngelo and Bob A. Hardage
Interpretation of multicomponent seismic data across Wister geothermal field, Imperial Valley, California (in Multicomponent seismic interpretation, Bob A. Hardage (prefacer), Michael V. DeAngelo (prefacer), Diana Sava (prefacer), Donald Wagner (prefacer), Paul Murray (prefacer), Charlotte Sullivan (prefacer), James Simmons (prefacer), Dan Ebrom (prefacer), Dan Roche (prefacer) and Ran Zhou (prefacer))
Interpretation (Tulsa) (May 2014) 2 (2): SE125-SE135

Abstract

Multicomponent seismic technology has been implemented across Wister geothermal field in southern California to evaluate the potential for further development of geothermal resources. The seismic survey was positioned atop the San Andreas fault system that extends southward from the Salton Sea. An interpretation of Wister Field geology was made using both P-P and P-SV seismic data. Two formation horizons, Canebrake/Olla/Diablo and Deguynos, were interpreted. Seismic time-structure maps were generated for each horizon. The objective of the study was to determine whether productive geothermal resources could be detected and mapped more reliably with multicomponent seismic data than with single-component P-P data. Complex faults associated with the regional San Andreas Fault system were interpreted across the 13.5 mi (super 2) 3D image space. The structural maps created are thought to be some of the most accurate depictions of subsurface structure publicly available in this area of the Imperial Valley. Particular attention was given to documenting faults that cut across deep strata. Both P-P and P-SV seismic showed evidence of such deep faults. Rock properties were analyzed from well logs. Log data showed that clastic rocks at this site exhibited measurable differences in V (sub p) /V (sub s) velocity ratios for different rock types. Specifically, sand-prone intervals were associated with relatively low V (sub p) /V (sub s) velocity ratios, and shale-dominated intervals had higher V (sub p) /V (sub s) ratios. Using this rock physics behavior, V (sub p) /V (sub s) values derived from seismic traveltime thicknesses were useful for recognizing lithological distributions and identifying favorable reservoir facies. Seismic data across Wister Field, like seismic data across many geothermal fields, have a low signal-to-noise character. We demonstrate that a unified and integrated interpretation of P and S data, even when seismic data quality is not as good as interpreters wish, can still yield valuable information for resource exploitation.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 2
Serial Issue: 2
Title: Interpretation of multicomponent seismic data across Wister geothermal field, Imperial Valley, California
Title: Multicomponent seismic interpretation
Author(s): Wei ShuijianDeAngelo, Michael V.Hardage, Bob A.
Author(s): Hardage, Bob A.prefacer
Author(s): DeAngelo, Michael V.prefacer
Author(s): Sava, Dianaprefacer
Author(s): Wagner, Donaldprefacer
Author(s): Murray, Paulprefacer
Author(s): Sullivan, Charlotteprefacer
Author(s): Simmons, Jamesprefacer
Author(s): Ebrom, Danprefacer
Author(s): Roche, Danprefacer
Author(s): Zhou, Ranprefacer
Affiliation: Sinopec, Petroleum Exploration and Production Research Institute, Beijing, China
Affiliation: Bureau of Economic Geology, Austin, TX, United States
Pages: SE125-SE135
Published: 201405
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 11
Accession Number: 2015-006985
Categories: Economic geology, geology of energy sourcesApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. chart, sects., sketch maps
Secondary Affiliation: PGS Americas, USA, United StatesPacific Northwest National Laboratory, USA, United StatesION, USA, United StatesStatoil, USA, United StatesCimarex, USA, United StatesHalliburton, USA, United StatesBureau of Economic Geology, USA, United States
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: 201504
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