陆相页岩储层地质力学特性及对压裂效果的影响

The Geomechanical Characteristics of the Continental Shale Reservoirs and Their Influence on the Fracturing Effect

熊健 吴俊 刘向君 张磊 梁利喜

XIONGJian WUJun LIUXiangjun ZHANGLei LIANGLixi

油气藏地质及开发工程全国重点实验室·西南石油大学, 四川 成都 610500 中国石油新疆油田公司玛湖勘探开发项目部, 新疆 克拉玛依 834000 中国石油新疆油田公司勘探开发研究院, 新疆 克拉玛依 834000

National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China Mahu Exploration and Development Project Department, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China

根据储层测井资料以及压后试油资料，分析了准噶尔盆地玛瑚凹陷风城组陆相页岩储层的地质力学特性，研究了地质力学参数对陆相页岩储层压裂效果的影响，并对陆相页岩储层可压裂性进行了评价。研究结果表明，风城组页岩油储层岩石力学参数与声波、体积密度间存在良好相关性，以此为基础，建立了储层岩石力学参数的测井计算模型；基于已钻井压裂、测井资料，建立了研究区陆相页岩储层地层压力、地应力计算模型；利用灰色关联法明确了储层影响压裂效果的地质力学主控因素（弹性模量、水平应力差、最小水平主应力、抗张强度以及单轴抗压强度）；利用层次分析法构建了研究区陆相页岩储层可压裂性评价指标，地质力学主控因素的权重系数依次为0.369 6、0.244 0、0.209 0、0.109 3及0.068 1。

According to the reservoir logging data and the post-fracturing oil test data, the reservoir geomechanical characteristics of the Fengcheng Formation continental shale reservoirs in the Mahu Sag, Junggar Basin were analyzed, and the main geomechanical factors affecting the fracturing effect were determined by the grey correlation method. Based on this, the fracturing evaluation index of Fengcheng Formation continental shale reservoirs was constructed by analytic hierarchy process. The results show that the relationships between rock mechanical parameters, acoustic wave and bulk density of Fengcheng Formation continental shale reservoirs are clarified, and the response mechanisms of rock mechanical parameters of continental shale reservoirs in the study area is revealed, so as to establish the calculation models of the reservoir rock mechanical parameters. Based on the drilling fracturing and logging data, the calculation models of formation pressure and in-situ stress of continental shale reservoirs in the study area is established. The main geomechanical factors affecting the fracturing effect of the reservoirs are determined with the grey correlation method, namely, elastic modulus, horizontal stress difference, minimum horizontal principal stress, tensile strength and uniaxial compressive strength. The fracturing evaluation index of the continental shale reservoirs in the study area is constructed by using analytic hierarchy process. The weight coefficients of the main geomechanical control factors are 0.369 6, 0.244 0, 0.209 0, 0.109 3 and 0.068 1.

10.11885/j.issn.1674-5086.2021.12.28.01