首页|A seismic elastic moduli module for the measurements of low-frequency wave dispersion and attenuation of fluid-saturated rocks under different pressures

A seismic elastic moduli module for the measurements of low-frequency wave dispersion and attenuation of fluid-saturated rocks under different pressures

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Knowledge about the seismic elastic modulus dispersion,and associated attenuation,in fluid-saturated rocks is essential for better interpretation of seismic observations taken as part of hydrocarbon identi-fication and time-lapse seismic surveillance of both conventional and unconventional reservoir and overburden performances.A Seismic Elastic Moduli Module has been developed,based on the forced-oscillations method,to experimentally investigate the frequency dependence of Young's modulus and Poisson's ratio,as well as the inferred attenuation,of cylindrical samples under different confining pressure conditions.Calibration with three standard samples showed that the measured elastic moduli were consistent with the published data,indicating that the new apparatus can operate reliably over a wide frequency range of f∈[1-2000,106]Hz.The Young's modulus and Poisson's ratio of the shale and the tight sandstone samples were measured under axial stress oscillations to assess the frequency-and pressure-dependent effects.Under dry condition,both samples appear to be nearly frequency inde-pendent,with weak pressure dependence for the shale and significant pressure dependence for the sandstone.In particular,it was found that the tight sandstone with complex pore microstructure exhibited apparent dispersion and attenuation under brine or glycerin saturation conditions,the levels of which were strongly influenced by the increased effective pressure.In addition,the measured Young's moduli results were compared with the theoretical predictions from a scaled poroelastic model with a reasonably good agreement,revealing that the combined fluid flow mechanisms at both mesoscopic and microscopic scales possibly responsible for the measured dispersion.

Low-frequency measurementsDispersion and attenuationRock physicsFluid flow

Yan-Xiao He、Shang-Xu Wang、Gen-Yang Tang、Chao Sun、Hong-Bing Li、San-Yi Yuan、Xian Wei、Li-Deng Gan、Xiao-Feng Dai、Qiang Ge、Peng-Peng Wei、Hui-Qing Zhang

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National Key Laboratory of Petroleum Resources and Engineering,CNPC Key Lab of Geophysical Exploration,College of Geophysics,China University of Petroleum(Beijing),Beijing,102249,China

School of Resources and Geosciences,China University of Mining and Technology,Xuzhou,221116,Jiangsu,China

Research Institute of Petroleum Exploration and Development CNPC,Beijing,100083,China

Beijing Vocational College of Labour and Social Security,Beijing,100029,China

PetroChina Dagang Oilfield Exploration and Development Research Institute,CNPC,Tianjin,300280,China

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NSFC Basic Research Program on Deep Petroleum Resource Accumulation and Key Engineering Technologies国家自然科学基金北京市自然科学基金Research and Development Department of China National Petroleum CorporationScientific Research and Technology Development Project of PetroChina国家重点研发计划

U19B6003-04-034193042582220732022DQ0604-012021DJ12062018YFA0702504

2024

10.1016/j.petsci.2023.08.036

石油科学(英文版)
中国石油大学（北京）

石油科学(英文版)

EI
影响因子：0.88
ISSN：1672-5107
年,卷(期)：2024.21(1)
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