临兴地区石盒子组低阻气层成因分析  

Genesis analysis of the low-resistivity gas layer of Shihezi Formation in Linxing area

作　　者：刘再振 葛岩 陈鑫 周文革[2] 李晨晨 马立涛 LIU Zaizhen;GE Yan;CHEN Xin;ZHOU Wenge;LI Chenchen;MA Litao(Engineering and Technology Branch,CNOOC Energy Technology and Services Limited,Tianjin 300452,China;China United Coalbed Methane Corporation Limited,Beijing 100011,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452 [2]中联煤层气有限责任公司,北京100011

出　　处：《断块油气田》2020年第6期745-749,共5页Fault-Block Oil & Gas Field

基　　金：中海油能源发展股份有限公司英才计划课题研究项目“临兴区块高产气层低阻成因研究”(HFKJYC-GJ201904)。

摘　　要：为阐明临兴地区石盒子组低阻气层的特征及成因,以铸体薄片、激光粒度、扫描电镜及高压压汞实验等数据为基础,对岩石物性、孔隙结构、束缚水饱和度、地层水矿化度及钻井液侵入、导电矿物和黏土矿物等6类电阻率的影响因素进行了逐一分析。结果表明:绿泥石薄膜是影响研究区低阻气层形成的关键因素,微晶高岭石对孔隙的充填、分割作用导致的高束缚水饱和度是该区低阻气层形成的背景因素。绿泥石薄膜的发育主要受沉积作用控制,分布范围与该时期河流方向一致,都呈近南北向展布;微晶高岭石的发育受成岩作用影响,主要在中成岩阶段A期,由长石和火成岩岩屑等碎屑颗粒受到有机酸的溶蚀作用而形成。In order to elucidate the characteristics and formation of the low-resistivity gas layer of the Shihezi Formation in Linxing area,Ordos Basin,based on the data of cast thin section,laser particle size analysis,scanning electron microscope and high-pressure mercury,six influencing factors of resistivity were analyzed including petrophysical properties,pore structure,immobile water saturation,formation water salinity and mud invasion,conductive minerals and clay minerals.The results show that chlorite film is the main factor for the formation of low-resistivity gas layer in the study area,while the high immobile water saturation caused by microcrystalline kaolinite filling and dividing pores is the background factor for the formation of low-resistivity gas layer in this area.The development of chlorite film is mainly controlled by sedimentation,and its distribution is near the north-south direction,which is consistent with the direction of the river during its period;the formation of microcrystalline kaolinite is mainly influenced by diagenesis,which was mainly formed in the middle diagenesis stage A by the clastic particles such as feldspar and igneous debris that were dissolved by organic acids.

关 键 词：低阻气层 束缚水饱和度 绿泥石薄膜 临兴地区 

分 类 号：TE122.23[石油与天然气工程—油气勘探]