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《Petroleum Geology and Recovery Efficiency》 2015-03
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Characterization method of vp/vsand its relationship with rock physical parameters of continental tight sandstone and shale reservoir

Yin Shuai;Ding Wenlong;Wang Ruyue;Zhao Jinli;Liu Jianjun;Zhang Ningjie;School of Energy Resources,China University of Geosciences(Beijing);Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism,Ministry of Education;Key Laboratory of Shale Gas Exploration and Evaluation,Ministry of Land and Resources;Shanxi CBM Exploration and Development Branch,Petro China Huabei Oilfield Company;Research Institute of Petroleum Exploration and Development,Petro China Huabei Oilfield Company;  
In order to study the geological structure characteristics of unconventional tight sandstone and shale reservoir,the relationship between vp/vsand rock lithology,physical properties,poisson ratio,stress and micro cracks of the deep tight sandstone and mud shale was studied based on the data of physical test,mechanical test and acoustic test of Triassic rocks in west Sichuan area. The results showed that vp/vscan distinguish lithology effectively;vp/vshas a positive correlation with porosity and permeability for the formations having the same lithology;abnormally high vp/vscan always occur with the formation of micro cracks under high stress;the rise of vp/vsand the decline of vsboth can indicate the development degree ofthe micro cracks. In the study area,vp/vsis more sensitive to the cracks. vp/vswas characterized and calculated by using poisson ratio and Gassmann equation respectively. It shows that these two methods both have a certain applicability,but the Gassmann equation has a much higher accuracy. A conclusion can be drawn that the theory of elastic wave in the complex formations of tight sandstone and shale is applicable.
【Fund】: 国家自然科学基金项目“渤海湾盆地济阳坳陷古近系陆相富有机质页岩裂缝研究”(41372139)和“中国南方下古生界海相富有机质裂缝发育程度与主控因素定量关系研究”(41072098);; 国家科技重大专项“渤海湾盆地页岩油气资源评价”(2011ZX05018-001-002)和“沾化凹陷罗家地区沙三下亚段泥储层裂缝形成与分布预测研究”(2011ZX05009-002-205)
【CateGory Index】: P618.13;P631.4
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