Sensitivity Analysis of Rock Electrical Influencing Factors of Natural Gas Hydrate Reservoir in Permafrost Region of Qilian Mountain, China

Lin, Zhenzhou; Dong, Huaimin; Hui, Fengming; Sun, Jianmeng; Wang, Xiaojiang

doi:10.3390/en12234592

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…By applying enhancing methods, they successfully prepared a 200 L specimen with a volume of high hydrate saturation of about 90%. To track hydrate distribution in sediments, electrical properties were always applied by inserting electrodes in the sediments [20][21][22]. Hydrate saturation could be inversed from measured resistivity via Archie's equation [23].…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Study on Hydrate Formation from Migrating Dissolved Gas in Sandy Sediments

Rehemituli

Zhang

et al. 2020

Energies

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Upward migration of gas-dissolved pore fluid is an important mechanism for many naturally occurring hydrate reservoirs. However, there is limited understanding in this scenario of hydrate formation in sediments. In this preliminary work, hydrate formation and accumulation from dissolved gas in sandy sediments along the migration direction of brine was investigated using a visual hydrate simulator. Visual observation was employed to capture the morphology of hydrates in pores through three sapphire tubes. Meanwhile, the resistivity evolution of sediments was detected to characterize hydrate distribution in sediments. It was observed that hydrates initially formed as a thin film or dispersed crystals and then became a turbid colloidal solution. With hydrate growth, the colloidal solution converted to massive solid hydrates. Electrical resistivity experienced a three-stage evolution process corresponding to the three observed hydrate morphologies. The results of resistivity analysis also indicated that the bottom–up direction of hydrate growth was consistent with the flow direction of brine, and two hydrate accumulation centers successively appeared in the sediments. Hydrates preferentially formed and accumulated in certain depths of the sediments, resulting in heterogeneous hydrate distribution. Even under low saturation, the occurrence of heterogeneous hydrates led to the sharp reduction of sediment permeability.

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Section: Introductionmentioning

confidence: 99%

One-Dimensional Study on Hydrate Formation from Migrating Dissolved Gas in Sandy Sediments

Rehemituli

Zhang

et al. 2020

Energies

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Digital rock-based investigation of conductivity mechanism in low-resistivity gas hydrate reservoirs: Insights from the Muli area's gas hydrates

Dong

Sun

Arif

et al. 2022

Journal of Petroleum Science and Engineering

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Numerical simulation of resistivity and saturation estimation of pore-type gas hydrate reservoirs in the permafrost region of the Qilian Mountains

Hu,

Zou,

Qin

et al. 2024

Journal of Geophysics and Engineering

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The pore-type hydrate reservoirs in the permafrost region of the Qilian Mountains (PRQM) have complex characteristics, including low porosity, low permeability, high shale content, and conductive minerals. Currently, the research on the electrical properties of these reservoirs still needs to be sufficiently in-depth, and there are limitations in well-logging evaluation methods. To fill in this gap, a conductivity model of pore-type gas hydrate reservoirs (GHRs) is established based on the pore-combination modeling theory to investigate the influencing factors of the resistivity characteristics of GHRs through numerical simulations. The comparison between the laboratory-measured resistivity of different hydrate saturations and the results of the calculated model shows good agreement, indicating the accuracy of the conductivity model in describing the electrical characteristics of GHRs in the PRQM. Compared to conductive minerals, the numerical simulation results indicate that the high shale content is the main reason for the decrease in resistivity of pore-type GHRs in the study area. The hydrate saturation evaluation of well DK-3 from 386.3 m to 393.6 m depth shows that the hydrate saturation ranges from 5.1% to 66.4%, with an average value of 44.0%. The identified hydrate interval using this model is consistent with the actual hydrate interval encountered during the drilling. This study, as an innovation, can help clarify the conductive mechanism of pore-type GHRs in the PRQM and provide more accurate parameters for evaluating gas hydrate resources in the study area.

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Sensitivity Analysis of Rock Electrical Influencing Factors of Natural Gas Hydrate Reservoir in Permafrost Region of Qilian Mountain, China

Cited by 3 publications

References 19 publications

One-Dimensional Study on Hydrate Formation from Migrating Dissolved Gas in Sandy Sediments

One-Dimensional Study on Hydrate Formation from Migrating Dissolved Gas in Sandy Sediments

Digital rock-based investigation of conductivity mechanism in low-resistivity gas hydrate reservoirs: Insights from the Muli area's gas hydrates

Numerical simulation of resistivity and saturation estimation of pore-type gas hydrate reservoirs in the permafrost region of the Qilian Mountains

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