延安地区长6油层裂缝特征及对注水开发影响  

CHARACTERISTICS OF CHANG 6 RESERVOIR AND THE INFLUENCE ON WATER INJECTION PRODUCTION IN YAN AN AREA

作　　者：付国民[1] 孙磊[1] 刘蕊[2] 苗箐[3] 李磊[3] 

机构地区：[1]长安大学资源学院,陕西西安710054 [2]中国石化西北分公司,新疆乌鲁木齐830011 [3]中国石化中原油田分公司,河南濮阳457001

出　　处：《西南石油大学学报（自然科学版）》2009年第3期74-77,共4页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家重点基础研究发展计划项目(2003CB214601);博士后基金(20070420489)

摘　　要：通过露头、岩芯、显微薄片多尺度裂缝描述及应用古地磁、地层倾角测井等裂缝检测方法,并结合注水开发动态分析,对鄂尔多斯盆地延安地区长6油层储层裂缝特征及其注水开发影响进行系统研究。研究表明:长6储层显裂缝主要以EW为主,次为SN向,局部发育NE及NW向裂缝;微裂缝由构造缝及成岩缝组成,近平行于大裂缝方向发育;在最大主应力方向为NE80°的现今应力场背景下,外力诱导致使东西向裂缝优先开启和连通,油井受效明显,含水上升快且易产生水淹,近南北向裂缝处于挤压闭合状况,裂缝孤立、连通性差,油井见效缓慢。采取适应性较好的菱形反9点注采井网形式以及不压裂投注、注水井组不同方向生产井采取不同的压裂参数等技术方法是改善裂缝向特低渗储层注水开发效果的关键。The characteristic of Yanchang reservoir and the influence on water injection production are systematic researched by means of outcrop,rock core and thin section inspection,as well as plate magnetism and dip log data.It is indicated that the macroscopic fractures in the reservoir are dominated by EW orientation,and SN orientation comes secondary,locally,the fractures with NE and NW orientation develop.The microscopic fractures are made up of tectonic ones and digenetic ones,parallel to macroscopic fracture orientation.On the setting of the present greatest stress being NE80°,outer force induces the fractures with E-W orientation to open and connect first,which makes oil wells improve,water cut increases quickly an dis easy to be flooded,and the fractures with S-N orientation are compressed and closed,with poor connection,oil wells are slowly improved.The technical method of diamond-shape inverted nine-spot well pattern.Non fracturing injection,different direction water injection and production well taking different fracturing parameters are the key to improve water injection effectiveness of super-low permeability reservoir.

关 键 词：储层裂缝 注水开发 长油层 延长组 鄂尔多斯盆地 

分 类 号：TE34[石油与天然气工程—油气田开发工程] TE122.3