【摘要】 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.更多还原

【Abstract】 The Yingshan Formation of Middle-Lower Ordovician in Tazhong uplift in Tarim is an important fracture and karstmodified carbonate reservoir.Main pore types in this reservoir include fractures,vug and caves,which mainly resulted from multi-stage epigenetic dissolution and post-stage hypogenetic excavation.The reservoir architectural systems are of extreme heterogeneity and significant compartmentalization.This study presents an architectural hierarchy for the reservoirs not controlled by facices according to the system theory.On the basis of integrated information revealed by a variety of methods,such as geophysical methods including prestack fracture prediction technology,paleo-geomorphological analysis technology,seismiclogging wave impedance inversion technology,three-dimensional seismic attribute extraction technology,and well-logging explanation,core observation etc,the four types of reservoir units including fracture-dominated,vug-dominated,cave-dominated and complex can be identified and mapped in this area,these reservoir architectural units genetically formed in epigenetic and hydrothermal karst modification,fracturing.Moreover,the genesis of some reservoir units are studied in detail.更多还原