首页|Saturation Estimation with Complex Electrical Conductivity for Hydrate-Bearing Clayey Sediments:An Experimental Study

Saturation Estimation with Complex Electrical Conductivity for Hydrate-Bearing Clayey Sediments:An Experimental Study

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Clays have considerable influence on the electrical properties of hydrate-bearing sediments.It is desirable to understand the electrical properties of hydrate-bearing clayey sediments and to build hydrate saturation(Sh)models for reservoir evaluation and monitoring.The electrical properties of tetrahydrofuran-hydrate-bearing sediments with montmorillonite are characterized by complex conductivity at frequencies from 0.01 Hz to 1 kHz.The effects of clay and Sh on the complex conductivity were analyzed.A decrease and increase in electrical conductance result from the clay-swelling-induced blockage and ion migration in the electrical double layer(EDL),respectively.The quadrature conductivity increases with the clay content up to 10%because of the increased surface site density of counterions in EDL.Both the in-phase conductivity and quadrature conductivity decrease consistently with increasing Sh from 0.50 to 0.90.Three sets of models for Sh evaluation were developed.The model based on the Simandoux equation outperforms Archie's formula,with a root-mean-square error(ERMS)of 1.8%and 3.9%,respectively,highlighting the clay effects on the in-phase conductivity.The fre-quency effect correlations based on in-phase and quadrature conductivities exhibit inferior performance(ERMS = 11.6%and 13.2%,re-spectively)due to the challenge of choosing an appropriate pair of frequencies and intrinsic uncertainties from two measurements.The second-order Cole-Cole formula can be used to fit the complex-conductivity spectra.One pair of inverted Cole-Cole parameters,i.e.,characteristic time and chargeability,is employed to predict Sh with an ERMS of 5.05%and 9.05%,respectively.

gas hydratecomplex electrical conductivityhydrate-bearing clayey sedimenthydrate saturationSimandoux equationfrequency dispersionCole-Cole formula

XING Lanchang、ZHANG Shuli、ZHANG Huanhuan、WU Chenyutong、WANG Bin、LAO Liyun、WEI Wei、HAN Weifeng、WEI Zhoutuo、GE Xinmin、DENG Shaogui

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College of Control Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China

School of Water,Energy and Environment,Cranfield University,Cranfield MK43 0AL,United Kingdom

Department of Alternative Energy,PetroChina Research Institute of Petroleum Exploration & Development,Langfang 065007,China

School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China

Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China

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Fundamental Research Funds for the Central UniversitiesMajor Scientific and Technological Projects of CNPCPetroChina Innovation FoundationShandong Provincial Natural Science FoundationNational Natural Science Foundation of China

20CX05005AZD2019-184-0012018D-5007-0214ZR2019MEE0954217 4141

2024

10.1007/s11802-023-5492-x

中国海洋大学学报(自然科学英文版)
中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCD
影响因子：0.268
ISSN：1672-5182
年,卷(期)：2024.23(1)
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