Rock-physics models of hydrate-bearing sediments in permafrost, Qilian Mountains, China

Liu, Jie; Liu, Jiangping; Cheng, Fei; Wang, Jing; Liu, Xiao-Xiao

doi:10.1007/s11770-017-0608-y

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…What is more, the rang of simulated gas hydrate saturation is 0~80.0% based on porosity of 7.0% and 10.0% by Liu et al . 48 . The above previous study results are basically in accordance with the calculated result made by the TCLM model.…”

Section: Resultsmentioning

confidence: 99%

Gas hydrate saturations estimated from pore-and fracture-filling gas hydrate reservoirs in the Qilian Mountain permafrost, China

Xiao

Zou

Lü

et al. 2017

Sci Rep

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Accurate calculation of gas hydrate saturation is an important aspect of gas hydrate resource evaluation. The effective medium theory (EMT model), the velocity model based on two-phase medium theory (TPT model), and the two component laminated media model (TCLM model), are adopted to investigate the characteristics of acoustic velocity and gas hydrate saturation of pore- and fracture-filling reservoirs in the Qilian Mountain permafrost, China. The compressional wave (P-wave) velocity simulated by the EMT model is more consistent with actual log data than the TPT model in the pore-filling reservoir. The range of the gas hydrate saturation of the typical pore-filling reservoir in hole DKXX-13 is 13.0~85.0%, and the average value of the gas hydrate saturation is 61.9%, which is in accordance with the results by the standard Archie equation and actual core test. The P-wave phase velocity simulated by the TCLM model can be transformed directly into the P-wave transverse velocity in a fracture-filling reservoir. The range of the gas hydrate saturation of the typical fracture-filling reservoir in hole DKXX-19 is 14.1~89.9%, and the average value of the gas hydrate saturation is 69.4%, which is in accordance with actual core test results.

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Section: Resultsmentioning

confidence: 99%

Gas hydrate saturations estimated from pore-and fracture-filling gas hydrate reservoirs in the Qilian Mountain permafrost, China

Xiao

Zou

Lü

et al. 2017

Sci Rep

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show abstract

“…If hydrate is part of the frame, the pore fluid is a mixture of water and free gas, such that its effective bulk modulus is (Wood, 1955;Wood et al, 2000;Liu et al, 2017)…”

Section: Properties Of Fluidmentioning

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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“…Chand et al (2006) use the self-consistent approximation, differential effective medium theory and consider the Biot and squirt-flow attenuation mechanisms to estimate the hydrate concentration in the Mallik area. An effective-medium model, considering different microstructures, has been considered in Liu et al (2017) and Qu et al (2016) use a model based on pennyshaped and infinite cracks. Sell et al (2016) combine tomography and 3D modeling to simulate the acoustic properties with digital rock physics, whereas Sell et al (2018) show that there is an interfacial water film between hydrate and grains through 3D micro-tomography, and a new conceptual squirt-flow model is proposed.…”

Section: Introductionmentioning

confidence: 99%

Wave Properties of Gas-Hydrate Bearing Sediments Based on Poroelasticity

Wang

Carcione

et al. 2021

Front. Earth Sci.

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Natural gas hydrates have the properties of ice with a microporous structure and its concentration in sediments highly affects the wave velocity and attenuation. Previous studies have performed investigations based on the measurements of laboratory data, sonic-log data, and field data, whereas the variation trend of wave dissipation with increasing hydrate concentration at different frequencies is still unclear. We consider two different models to study this problem, both based on the Biot-Rayleigh double-porosity theory. In the first model, hydrate is part of the pore infill, unbonded from the grains, and brine saturates the remaining pore space. In the second model, hydrate forms a second skeleton and cements the grains. We obtain the P-wave velocity dispersion and attenuation as a function of the inclusion radius, porosity, and hydrate content. The analysis shows that the predictions of both models agree with the experimental data. At sonic log frequencies, the second model predicts much more attenuation, due to wave-induced local fluid flow (mesoscopic loss), and the behavior is such that below a given hydrate concentration the dissipation increases and then decreases beyond that concentration.

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Rock-physics models of hydrate-bearing sediments in permafrost, Qilian Mountains, China

Cited by 9 publications

References 9 publications

Gas hydrate saturations estimated from pore-and fracture-filling gas hydrate reservoirs in the Qilian Mountain permafrost, China

Gas hydrate saturations estimated from pore-and fracture-filling gas hydrate reservoirs in the Qilian Mountain permafrost, China

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

Wave Properties of Gas-Hydrate Bearing Sediments Based on Poroelasticity

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