摘要
为了给碳酸盐岩储层酸压改造方案的设计提供详实准确的储层物性数据,通过X-射线衍射、电子显微镜扫描分析、岩石薄片鉴定等方法对某低渗油田若干油井的储层岩心做了细致分析。分析结果表明,该低渗油田碳酸盐岩储层孔隙发育、连通性好,地质过程有利于油气的储存;方解石和白云石是主要的酸敏性矿物,同时由于黏土矿物的存在使得储层具有一定的水敏性;岩心渗透率极差,应力敏感性损害程度为中等偏弱,岩心的临界应力应在3.5MPa上下。据此可充分认为酸化压裂是对该油田储层改造的一种有效手段,同时也为酸化压裂液体系的选择和酸压工艺的设计提供重要参考。
To provide full and accurate data of reservoir physical property for the design of fracturing reconstruction for a carbonate reservoir,a detailed analysis is made for the reservoir cores from some oil wells in a low permeability oilfield through X-RD,SEM and thin section identification method.The results show that the pore development and connectivity are both good in the carbonate reservoirs of oilfield,the geological process is beneficial for oil and gas storage;calcite and dolomite are the main acid sensitive minerals.Because of the presence of clay minerals,the reservoir has a certain degree of water sensitivity,core permeability there is very poor,the stress sensitivity is moderate to weak,and the core's critical stress should be at 3.5MPa.Accordingly,it can be fully considered that acid fracturing is an effective method for reservoir reconstruction,at the same time,it provides important reference to the selection of acid fracturing system and the design of acidizing process.
出处
《长江大学学报（自科版）（上旬）》
CAS
2015年第2期25-28,4,共4页
JOURNAL OF YANGTZE UNIVERSITY (NATURAL SCIENCE EDITION) SCI ＆ ENG
基金
非常规油气湖北省协同创新中心基金项目(HBUOG-2014-21)
关键词
低渗透油田
碳酸盐岩储层
酸压
岩心
low permeability oilfield
carbonate reservoir
acid fracturing
core analysis
