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Gas hydrate quantification in Walker Ridge Block 313, Gulf of Mexico, from full-waveform inversion of ocean-bottom seismic data

Wang Jiliang, Priyank Jaiswal, Seth S. Haines, Yihong Yang, Patrick E. Hart and Wu Shingo
Gas hydrate quantification in Walker Ridge Block 313, Gulf of Mexico, from full-waveform inversion of ocean-bottom seismic data
Interpretation (Tulsa) (December 2019) Pre-Issue Publication: T27-T42

Abstract

The Gulf of Mexico (GOM) Joint Industry Project Leg 2 logging-while-drilling data in Walker Ridge lease block 313 (WR313) in the GOM detected gas hydrate in coarse- and fine-grained sediments at sites WR313-G and WR313-H. The coarse-grained units are thin (<10 m) and highly saturated, whereas the fine-grained unit is thick (approximately 200 m) with low saturation and fracture-filling gas hydrate. Unlike its coarse-grained counterpart, the seismic character of the fine-grained unit does not clearly indicate the presence of gas hydrate, which would likely have remained undiscovered in the absence of drilling. In this paper, through frequency-domain acoustic full-waveform inversion (FWI) of ocean-bottom seismometer data along a 2D multichannel seismic transect near sites WR313-G and WR313-H, we detect and quantify gas hydrate in the fine-grained unit. Key results are as follows: First, the base of the gas hydrate stability zone, which is not obvious in the reflection profile, can be discerned in the FWI results. Second, the gas hydrate in the fine-grained unit is mainly confined to the area between two sets of opposite-dipping normal faults implying that the fault architecture may be partially responsible for this gas hydrate accumulation and distribution.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: Pre-Issue Publication
Title: Gas hydrate quantification in Walker Ridge Block 313, Gulf of Mexico, from full-waveform inversion of ocean-bottom seismic data
Affiliation: Chinese Academy of Sciences, Institute of Deep-Sea Science and Engineering, Sanya, China
Pages: T27-T42
Published: 20191220
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 67
Accession Number: 2020-011812
Categories: Economic geology, geology of energy sourcesApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 1 table, sketch map
N26°36'00" - N26°45'00", W91°47'60" - W91°35'60"
Secondary Affiliation: Oklahoma State University, USA, United StatesU. S. Geological Survey, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, 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: 2020
Program Name: USGSOPNon-USGS publications with USGS authors
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