构造应力-流体压力耦合作用下的裂缝发育特征——以渤海湾盆地东濮凹陷柳屯洼陷裂缝性泥页岩“油藏”为例  

Fracture characteristics under the coupling effect of tectonic stress and fluid pressure: A case study of the fractured shale oil reservoir in Liutun subsag, Dongpu Sag, Bohai Bay Basin, Eastern China

作　　者：骆杨[1] 赵彦超[1] 陈红汉[1] 苏惠[2] 

机构地区：[1]中国地质大学(武汉)构造与油气资源教育部重点实验室 [2]中国石化中原油田公司

出　　处：《石油勘探与开发》2015年第2期177-185,共9页Petroleum Exploration and Development

基　　金：国家自然科学基金项目(41402117);国家科技重大专项(2011ZX05006-004);中央高校基本科研业务费专项资金资助项目(CUGL140808)

摘　　要：利用岩心观察、流体包裹体分析和盆地模拟等方法,考虑构造应力与流体压力耦合关系,对渤海湾盆地东濮凹陷柳屯洼陷沙三上亚段盐间强超压裂缝性泥页岩"油藏"中的裂缝发育特征进行了研究。结果表明:1该油藏的裂缝以构造裂缝和水力破裂缝为主,强超压区域内裂缝产状散乱,甚至发育水力破裂水平缝;2超压通过改变岩石的孔隙弹性响应和渗透力作用来改变地层的差异应力和主应力方向,从而影响裂缝的类型和产状;3构造裂缝和水力破裂缝可细分为7种应力状态类型、3期发育,其中纵张和横张裂缝主要在第1期发育,水力破裂缝主要在第2期内构造抬升前发育,构造剪裂缝主要在第2和第3期发育,构造应力和超压均强烈发育时裂缝类型和产状呈多样化。Based on the integrated study on core description, fluid inclusions and basin modeling, and considering the coupling effect of tectonic stress and fluid pressure, the characteristics of fractures were analyzed in the inter-salt fractured shale oil reservoirs of strong overpressure in upper Sha 3 member（Es3） in Liutun subsag, Dongpu Sag, Bohai Bay Basin. The results show that：（1） Most of fractures in this reservoir are structural or hydraulic, with scattered occurrence, even horizontal hydraulic fractures in strong overpressure area;（2） Overpressure changes the differential stress and principal stress direction by changing the poroelastic response of rock and the seepage force of pore fluid, and thus influencing the type and occurrence of fractures;（3） Structural and hydraulic fractures can be divided into seven types according to their stress states. The development of those fractures includes 3 stages. The transverse tension and longitudinal tension fractures are mainly developed in the first stage, tectonic shear fractures mainly in the second and third stages, and hydraulic fractures mainly in the early phase of the second stage before tectonic uplift. When tectonic stress and overpressure are both strong, the type and occurrence of fractures are diverse.

关 键 词：流体压力-构造应力耦合 裂缝性泥页岩“油藏” 超压 裂缝类型 裂缝产状 柳屯洼陷 

分 类 号：TE122.1[石油与天然气工程—油气勘探]