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Azimuthal anisotropy analysis of multiazimuth p-wave seismic data; an example from the Rock Springs Uplift, Wyoming, USA

Hema S. Sharma, Subhashis Mallick, Sumit Verma and Erin Campbell
Azimuthal anisotropy analysis of multiazimuth p-wave seismic data; an example from the Rock Springs Uplift, Wyoming, USA
Interpretation (Tulsa) (August 2018) 6 (3): T649-T666

Abstract

Our study area in Rock Sprigs Uplift, Wyoming, lies close to the carbon dioxide (CO2)-producing Jim Bridger power plant, and hence it is a good site for carbon sequestration. Two subsurface reservoirs within this area are being analyzed for their capability of long-term carbon storage. The presence and orientation of fractures within a reservoir and the associated seal govern the efficiency and long-term effectiveness of CO2 storage. The presence of natural fractures gives rise to seismic anisotropy that is related to the fracture orientation and density. This work analyzed P-wave multiazimuth seismic amplitude and well data from a potential carbon sequestration site for the anisotropy analysis. Using prestack waveform inversion, accurate azimuthal velocities were obtained for offset-to-angle transformation and to compute azimuthal angle gathers. These angle gathers were then stacked for each azimuth and analyzed for azimuthal anisotropy to estimate the fracture orientation and relative fracture density. Finally, by corroborating the results of the seismic azimuthal analysis with well data, it was confirmed that the results from the azimuthal analysis of the angle stacks are related to the fracture orientation and density.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 6
Serial Issue: 3
Title: Azimuthal anisotropy analysis of multiazimuth p-wave seismic data; an example from the Rock Springs Uplift, Wyoming, USA
Affiliation: Western University, Department of Earth Sciences, London, ON, Canada
Pages: T649-T666
Published: 201808
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 40
Accession Number: 2019-007390
Categories: Engineering geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. chart, strat. cols., geol. sketch maps, sects.
N41°34'60" - N41°34'60", W109°00'04" - W109°00'04"
Secondary Affiliation: University of Wyoming, USA, United StatesUniversity of Texas, USA, United StatesWyoming State Geological Survey, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 2019
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