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Quadri-joint inversion; method and application to the Big Sky 9C 3D data set in northern Montana

Vincent Clochard, Bryan C. DeVault, David Bowen, Nicolas Delepine and Kanokkarn Wangkawong
Quadri-joint inversion; method and application to the Big Sky 9C 3D data set in northern Montana
Interpretation (Tulsa) (November 2018) 6 (4): SN101-SN118

Abstract

The Kevin Dome CO2 storage project, located in northern Montana, attempted to characterize the Duperow Formation as a potential long-term storage zone for injected CO2. A multicomponent (9C) seismic survey was acquired for the Big Sky Carbon Sequestration Partnership over a portion of the Kevin Dome using P- and S-wave sources. Prestack migrated PP, PS, SH, and SV data sets were generated. We then applied several stratigraphic inversion workflows using one or several kinds of seismic wavefield at the same time resulting in joint inversions of each data set. The aim of our study is to demonstrate the benefits of doing quadri-joint inversion of PP-, PS-, SH-, and SV-wavefields for the recovery of the elastic earth parameters, especially the S-wave impedance and density. These are crucial parameters because they can help determine lithology and porefill in the reservoir characterization workflow. Because the inversion workflow always uses the original seismic data recorded in its own time domain, it is necessary to compute registration laws between PP-PS-, PP-SH-, and PP-SV-wavefields using a time shift computation procedure (warping) based on inverted S-wave impedances from inversion of a single wavefield. This generated a significant improvement over methods that rely on attempting to match trace waveforms that may have a different phase, frequency content, and polarity. Finally, we wanted to investigate the reliability of the quadri-joint inversion results in the Bakken/Banff Formations, which have less lateral geologic variation than the underlying Duperow target. This interval shares many of the geophysical characterization challenges common to shale reservoirs in other North American basins. We computed geomechanical parameters, such as Poisson's ratio and Young's modulus, which are a proxy for brittleness. Comparison of these results with independent laboratory measurements in the Bakken interval demonstrates the superiority of the quadri-joint inversion method to the traditional inversion using P-wave data only.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 6
Serial Issue: 4
Title: Quadri-joint inversion; method and application to the Big Sky 9C 3D data set in northern Montana
Affiliation: IFP Energies Nouvelles, Rueil-Malmaison, France
Pages: SN101-SN118
Published: 201811
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 25
Accession Number: 2019-007383
Categories: Applied geophysicsEngineering geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Special section; Shale oil and gas enrichment mechanisms and effective development
Illustration Description: illus. incl. sects., strat. col., sketch maps
N48°15'00" - N49°00'00", W112°15'00" - W111°19'60"
Secondary Affiliation: Vecta Oil and Gas, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 2019
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