Wave Properties of Gas-Hydrate Bearing Sediments Based on Poroelasticity

Wang, Wei; Ba, Jing; Carcione, José M.; Liu, Xu; Zhang, Lin

doi:10.3389/feart.2021.640424

Cited by 8 publications

(6 citation statements)

References 49 publications

(87 reference statements)

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“…Having been viewed as a potential resource, the hydrates are not merely the targets of offshore drilling, infrastructure, and slope stability assessment, but also play a vital role in the study of global climate change and the carbon cycling (Kvenvolden, 2000;Zhang et al, 2020;Kars et al, 2021;Yao et al, 2021;Yu et al, 2022). Therefore, submarine hydrate identification has been of great interest to academic and related industries in recent years (Li et al, 2016;Becker et al, 2020;Merle et al, 2021;Wang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Saturation sensitivity and influencing factors of marine DC resistivity inversion to submarine gas hydrate

Qiu

Fu²,

Yang³

et al. 2022

Front. Earth Sci.

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The submarine gas hydrate usually exists in the sediment on the continental slope. The bottom simulating reflector on the reflected seismic was identified as the bottom of the hydrate stability zone. However, many BSRs may not find the hydrate’s effective storage and its underlying free gas in many places. It is essential to identify the saturation of the hydrate. The resistivity can be used to evaluate the hydrate’s porosity and saturation. The hydrate boasts a high resistance to the surrounding sediments. The sensitivity of the marine Direct Current resistivity method (DCR) to the high resistance of the sediment can be used to evaluate the saturation of the hydrate. We have assessed the sensitivity of various DCR array arrangements, towed depths, hydrate thicknesses, and saturation. These influencing factors for improving recognition ability were also systematically analyzed. We have compared the inversion results of various DCR array arrangements, as well as different depths, thicknesses, and hydrate saturation, and calculated the saturation. We suggest using the corrected saturation equation to analyze the DCR results, which can improve the ability of hydrate identification. Evaluating these parameters will help develop or select DCR instruments for detecting the submarine gas hydrate.

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Section: Introductionmentioning

confidence: 99%

Saturation sensitivity and influencing factors of marine DC resistivity inversion to submarine gas hydrate

Qiu

Fu²,

Yang³

et al. 2022

Front. Earth Sci.

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“…Let us define the volume ratios, local porosities and absolute porosities of the host phase made of quartz and calcite, hydrate skeleton and clay skeleton as ] 2 , ] 1 and ] 3 , ϕ 20 , ϕ 10 and ϕ 30 , and ϕ 2 , ϕ 1 and ϕ, respectively, with ϕ 1 ϕ 10 ] 1 , ϕ 2 ϕ] 2 and ϕ 3 ϕ 30 ] 3 (Zhang et al, 2017;Wang et al, 2021;Zhang et al, 2021), and…”

Section: Properties Of the Framementioning

confidence: 99%

“…The double-porosity theory considers that in the process of seismic wave propagation, the micropore structure of the hydrate phase induces a local flow between these micropores and the stiff pores and causes energy loss and velocity dispersion (see Figure 4). This theory, however, ignores the presence of clay, which may also cause flow (Wang et al, 2021). The inclusion of clay leads to the triple-porosity model (see red arrow in Figure 4).…”

Section: Properties Of the Saturated Sedimentmentioning

confidence: 99%

P-wave anelasticity in hydrate-bearing sediments based on a triple-porosity model

Guo²,

Carcione³

et al. 2023

Front. Earth Sci.

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P-wave anelasticity (attenuation and dispersion) of hydrate-bearing sediments depends on several factors, namely the properties of the mineral components, hydrate content and morphology, and fluid saturation. Anelasticity is analyzed with a triple-porosity model (stiff pores, clay micropores and hydrate micropores), by considering hydrate as an additional solid skeleton. We relate the hydrate volume ratio, porosity and radii of the hydrate inclusion and clay mineral to the P-wave velocity and attenuation. The model takes wave-induced local fluid flow (mesoscopic loss) at the grain contacts into account. The results are compared with those of a double-porosity and load-bearing models, and verified with well-log data from Offshore Drilling Program sites 1247B and 1250F, and data reported in Nankai Trough, Japan. Model results and data show a good agreement.

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“…These anomalies are often used to characterize the distribution and amount of gas hydrates in sediments by establishing quantitative physical relationships between these properties and hydrate content (e.g., Ecker et al, 2000;Hu et al, 2010;Lee & Collett, 2013;W. Wang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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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Wave Properties of Gas-Hydrate Bearing Sediments Based on Poroelasticity

Cited by 8 publications

References 49 publications

Saturation sensitivity and influencing factors of marine DC resistivity inversion to submarine gas hydrate

Saturation sensitivity and influencing factors of marine DC resistivity inversion to submarine gas hydrate

P-wave anelasticity in hydrate-bearing sediments based on a triple-porosity model

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

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