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Anisotropic dispersion mechanism of inter-salt shale oil reservoir in terrestrial saline lake sediments using cross-band experiments

引用

Science China Earth Sciences 2023年第7期66卷 1603-1621页

作者： Zengjia XIAO Jianguo ZHAO Qingliang ZHONG Fang OUYANG Xinze LIU Bohong YAN Zhi LI Ming MA Bin WANG Xiaoqiong WANG State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum(Beijing)Beijing 102249China Exploration and Production Research Institute of Jianghan oilfield Branch of Sinopec Wuhan 434124China Institute of Earthquake Forecasting CEABeijing 100036China Yumen oil Field Branch of CNPC Exploration and Development Research Institute Jiuquan 735000China

The rock mechanical properties and elastic anisotropy of terrestrial shale oil reservoirs are affected by various factors,such as lithology,structure,pores,fractures,and *** experimental study of dynamic and static elastic properties can provide important mechanism analysis for the prediction of geological and engineering “sweet spots” in shale *** are a large number of studies on the measurement of static mechanical properties of shale,but the experiments on dynamic crossband elastic anisotropy of terrestrial shale have not yet been conducted ***,we report the anisotropic dispersion mechanism of favorable lithofacies(lamellar dolomitic shale,with vertical and horizontal bedding) in the inter-salt shale oil reservoir of the Qianjiang Formation for different confining pressures and fluid saturation *** experiments were conducted by the cross-band rock physics measurement technology that comprised low-frequency stress-strain measurements and a high-frequency ultrasonic *** experimental results indicated that:(1) The elastic property dispersion of the terrestrial shale was stronger than that of marine shale due to the high viscosity of the medium oil in the terrestrial *** lamellar structures and interbedded fractures were the main factors that determined the strong anisotropy of the terrestrial shale.(2) The dispersion of elastic properties from low to high frequencies in a partial oil saturation state ranged from strong to weak;the wave-induced fluid flow or intrinsic dissipation of viscoelastic inclusions may be the dominant mechanisms that caused the seismic dispersion.(3) The elastic parameters measured in the direction vertical to the bedding plane had stronger dispersion and pressure sensitivity than those measured in the direction parallel to the bedding plane,and the anisotropy and pressure sensitivity at seismic frequencies were higher than those at the ultrasonic frequencies.(4) Fluid filling reduced

关键词： terrestrial shale oil reservoir Rock physics Cross-band experiment Anisotropic dispersion Pressure sensitivity

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