论文部分内容阅读
塔里木盆地塔中地区下奥陶统鹰山组是一套由喀斯特改造的碳酸盐岩储层,其储集空间主要为裂缝或与裂缝相关的溶蚀孔洞,岩石基质孔隙很低.这些储集空间主要是由多期表生溶蚀作用与后期上升型溶蚀作用叠加改造的结果,因此储层结构复杂、非均质性强.针对这类储层的发育特点,从储层地质静态描述的角度,按系统论思想,明确了“孔洞-裂缝储集系统”的科学内涵,提出了以缝洞储集单元为核心的解剖思路和方法,并以多种地球物理方法包括叠前裂缝预测技术、碳酸盐岩古地貌分析技术、地震-测井联合波阻抗反演技术以及三维地震属性提取及雕刻等所揭示的信息为基础,综合考虑储层发育的构造及其水文地质边界条件,对缝洞储集单元进行了划分.在此基础上,结合钻井岩心及测井分析获得储集空间类型、结构及其成因信息,将该区缝洞储集单元划分为表生岩溶型、热液岩溶型和裂缝型3种成因类型,明确了部分储集单元的成因属性.
The Lower Ordovician Yingshan Formation in Tazhong area, Tarim Basin, is a suite of karst-altered carbonate reservoirs with predominantly fractures or fracture-related cavities with low porosity of the rock matrix. These reservoirs are mainly Is a result of superposition and remodeling of multi-stage surface dissolution and later-stage ascending dissolution, so the reservoir structure is complex and heterogeneous.According to the developmental characteristics of such reservoirs, from the perspective of reservoir geological static description, System theory, the scientific connotation of “hole-fracture reservoir system” was clarified and the anatomic methods and methods centered on the fracture-cave reservoir were put forward. With a variety of geophysical methods including pre-stack fracture prediction techniques, Based on the paleogeomorphology analysis techniques of carbonate rocks, seismic inversion-logging combined wave impedance inversion technique and the information disclosed by 3D seismic attribute extraction and carving, taking into account the structural development of the reservoir and its hydrogeological boundary conditions, Based on this, the type, structure and genesis of reservoir space are obtained by combining drilling core and well logging analysis, and the reservoir units of fractures and vugs in this area are divided into epikarst Type, hydrothermal karst and fractured three genetic types, attributes define the causes part of the reservoir unit.