摘要
通过野外地质调查和地面样品的测试分析,对秀山上寒武系统后坝组储层特征进行了研究。认为该区后坝组主要为一套白云岩,其次为灰岩,还有少量砂岩。碳酸盐岩岩石类型较为复杂,有砂屑、砾屑白云岩,藻白云岩、微晶-粉晶白云岩以及鲕粒、藻团粒灰岩等;储集空间以晶间孔、晶间溶孔为主;孔隙度主要在1%～4%之间,渗透率多小于0.05mD,为低孔、低渗储层。其中,以生物碎屑和鲕粒结构为主的碳酸盐岩类溶蚀作用发育,孔隙度较高。
On the basis of both geological survey and sample analysis,reservoir characteristics of Cambrian Houba Formation in Xiushan area are studied.It is considered that the formation consists of dolomite primarily,limestone secondly,and small amounts of sandstone.For carbonate rock,there are complicated types,including arenstritic and rudaceous dolomites,algal dolomite,microlithic-rose quartz dolomite,oolitic and algal limestones;its reservoir spaces are mainly intercrystalline and intercrystalline dissolution pores.It is a low-porosity and low-permeability reservoir with porosity of 1%~4% and permeability less than 0.05mD.Carbonate dissolution dominated by bioclasts and oolitic structure develops with higher porosity.
出处
《天然气勘探与开发》
2013年第1期16-19,80,共4页
Natural Gas Exploration and Development
关键词
重庆秀山
后坝组
碳酸盐岩储层
Xiushan area of Chongqing,Houba Formation,carbonate reservoir
