Gas hydrate quantification in Walker Ridge block 313, Gulf of Mexico, from full-waveform inversion of ocean-bottom seismic data
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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.
Suggested Citation
Wang, J., Jaiswal, P., Haines, S.S., Yang, Y., Hart, P.E., 2020, Gas hydrate quantification in Walker Ridge block 313, Gulf of Mexico, from full-waveform inversion of ocean-bottom seismic data: Interpretation, v. 8, no. 1, p. T27-T42, https://doi.org/10.1190/INT-2018-0165.1.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Gas hydrate quantification in Walker Ridge block 313, Gulf of Mexico, from full-waveform inversion of ocean-bottom seismic data |
| Series title | Interpretation |
| DOI | 10.1190/INT-2018-0165.1 |
| Volume | 8 |
| Issue | 1 |
| Year Published | 2020 |
| Language | English |
| Publisher | Society of Exploration Geophysicists |
| Contributing office(s) | Central Energy Resources Science Center, Pacific Coastal and Marine Science Center |
| Description | 16 p. |
| First page | T27 |
| Last page | T42 |
| Country | United States |
| Other Geospatial | Gulf of Mexico |