川东北通江-马路背地区须家河组断缝体储层特征及成因

四川盆地东北部通江-马路背地区须家河组受多期构造运动叠加影响,构造变形强烈,发育多套规模砂体,须家河组发育特殊类型"断缝体"储层.运用钻井统计分析与区域构造演化相结合的方法,对该区储层特征、形成机理及发育控制因素进行研究.结果表明:这类储层是规模网状裂缝与相对高孔基质孔隙叠加形成规模网状缝孔储渗体,具有高孔、多缝、孔缝...

Characteristics and genesis of fault-fracture reservoirs in the Xujiahe Formation,Tongjiang-Malubei area,northeastern Sichuan Basin

Affected by the superposition of multi-phase tectonic movements, the Xujiahe Formation in Tongjiang-Malubei area of the northeastern Sichuan Basin contains many sets of large-scale sand layers and special fault-fracture reservoirs in highly deformed structures.A study of reservoir characteristics, formation mechanisms and development control factors, in combination with drilling data and regional tectonic evolution for the formation, shows that the reservoirs are highly porous with well-developed fractures and feature in close relation between matrix pores and pore-fracture networks.The formation of fault-fracture reservoirs is closely linked to the triple-layer tectonic pattern and multi-phase tectonic movements in the area.The regional tectonic stress field and deep fluid activities serve respectively as the external mechanical background and internal genetic mechanism for the development of reservoirs.With source rock-rooted faults having dual functions of connecting source rock with reservoir and controlling the development of reservoirs, large-scale sand layers providing the basis for fracturing and dissolution, and local structures controlling the formation of complex fracture networks, the fault-fracture reservoirs with hydrocarbon came into being in the formation.