Modeling of seismic attenuation in fracture-filling gas hydrate-bearing sediments and its application to field observations in the Krishna-Godavari Offshore Basin, India

Liu, Tao; Bao, Xueyang; Guo, Junxin

doi:10.1016/j.marpetgeo.2022.105698

Cited by 2 publications

(15 citation statements)

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“…Liu et al. (2022) quantified the consolidation degree of pure gas hydrate and found that hydrate is much stiffer than the surrounding unconsolidated host sediment. By adding hydrate to the model of the host sediment, the frame of the host sediment is strengthened and the squirt flow in the host sediment is weakened, leading to a lower attenuation of the model.…”

Section: Estimation Of Gas Hydrate Concentration At Hydrate Ridgementioning

confidence: 99%

“…Here we present the key formulas and model features of the rock physics model used in our study. Liu et al (2022)'s model treats the gas hydrate-bearing sediments (GHBS) as a composite of host sediment and pure gas hydrate. Therefore, we first review the attenuation mechanism of the host sediment without gas hydrate, and then show the property of pure gas hydrate and its effect on the model.…”

Section: Appendix A: Mathematical Formulation Of the Attenuation Modelmentioning

confidence: 99%

“…Values of all the parameters are listed in Table B1 in Appendix B. For more details about the model, the reader is referred to the original reference (Liu et al, 2022). The effect of gas hydrate presence on the attenuation of the model is shown in Figure A2.…”

Section: A2 Gas Hydrate-bearing Sedimentmentioning

confidence: 99%

“…The principal attenuation occurs at seismic frequencies, and the relaxation frequency and magnitude of the attenuation curve are affected by the concentration (C a ) and the aspect ratio (α) of the intracrystalline water in swelling clays. Liu et al (2022) quantified the consolidation degree of pure gas hydrate and found that hydrate is much stiffer than the surrounding unconsolidated host sediment. By adding hydrate to the model of the host sediment, the frame of the host sediment is strengthened and the squirt flow in the host sediment is weakened, leading to a lower attenuation of the model.…”

Section: Rock-physics Modelmentioning

confidence: 99%

“…Recently, Liu et al. (2022) presented a theoretical model focusing on the attenuation property for gas hydrate‐bearing clays, whose performance has been verified by the field attenuation data in the Krishna‐Godavari Basin. We thus choose this model in our study.…”

Section: Introductionmentioning

confidence: 96%

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Estimation of Seismic Attenuation and Gas Hydrate Concentration From Surface Seismic Data at Hydrate Ridge, Cascadia Margin

Liu,

Bao,

Geng

et al. 2024

JGR Solid Earth

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An improved understanding of the effects of gas hydrate presence on seismic attenuation is important for accurate hydrate characterization and quantification. Based on a rock‐physics model recently presented for gas hydrate‐bearing fine‐grained clay‐dominated sediments, here we establish an integrated workflow for surface seismic data from extracting seismic attenuation to estimating gas hydrate concentration (Ch) in the sediment. We apply this workflow to the high‐resolution seismic data acquired at southern Hydrate Ridge, offshore Oregon, to reveal the hydrate distribution and clarify the controlling factor of hydrate formation. We first present an adaptive‐bandwidth spectral ratio method to robustly measure attenuation. The attenuation measurements show that the presence of hydrate suppresses the attenuation of the host sediment. We then calculate Ch by applying the rock‐physics model to the attenuation measurements. The estimated Ch are mostly low (<5%) in Hydrate Ridge and agrees well with the in‐situ Ch measured from core‐ or well log‐based data. Our result also suggests that the lithology and stratigraphic structures together control the distribution of gas hydrate at Hydrate Ridge, where relatively high Ch is found in the region where a gas‐charged conduit exists and in an anticlinal structure overlying a strong bottom simulating reflection. Adjacent to the anticline, however, a low amount of gas hydrate appears present, possibly due to the gas migration blocked by the anticlinal structure or the lack of gas conduits. Our study offers an effective strategy for detecting and quantifying gas hydrate in fine‐grained clayey sediments through surface seismic data.

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Section: Estimation Of Gas Hydrate Concentration At Hydrate Ridgementioning

confidence: 99%

Section: Appendix A: Mathematical Formulation Of the Attenuation Modelmentioning

confidence: 99%

Section: A2 Gas Hydrate-bearing Sedimentmentioning

confidence: 99%

Section: Rock-physics Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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