川东南地区须家河组低阻气层成因机制  

Genetic pattern of low-resistivity gas reservoirs in the Xujiahe Formation,southeastern Sichuan Province

作　　者：蒋裕强[1] 张春[1] 谭勇[2] 郭红光[1] 徐后伟[1] 季春海[1] 

机构地区：[1]西南石油大学资源与环境学院,四川成都610500 [2]中国石油西南油气田公司重庆气矿,重庆400021

出　　处：《石油与天然气地质》2011年第1期124-132,共9页Oil & Gas Geology

摘　　要：川东南地区上三叠统须家河组含气层普遍具有低阻特征,成因类型复杂多样,气、水关系复杂,识别难度大。利用岩心分析化验、录井、测井、构造及试油等资料,结合低阻气层测井响应特征,从宏观和微观方面入手,对该区低阻气层成因机制进行系统深入剖析。研究表明,造成该区低阻气层的主控因素为:①低幅度构造背景下发育低孔、低渗泥质砂岩储层;②孔隙结构复杂,高束缚水饱和度,高地层水矿化度;③低能沉积环境下储层颗粒细,泥质含量较高,粘土矿物附加导电性及局部导电矿物富集。储层物性与电阻率呈一定负相关关系。Gas reservoirs in the Upper Triassic Xujiahe Formation,southwestern Sichuan Province are characte-rized by low resistivity,complex genetic types and complex gas-water relationships,which make them hard to identify.Using data from core analysis,logging,structures,testing and logging responses,we thoroughly examine genetic pattern of low resistivity gas reservoirs in the study area from macro-and micro-views.According to this study,main controlling factors responsible for the development of these low resistivity gas reservoirs are： 1） muddy sandstone reservoirs with low porosity and permeability developing in the context of low-amplitude structures;2） complex pore configurations,high water saturation,and high formation water salinity;3） low-energy sedimentary environment resulting in fine particles in reservoirs,high mud content,some clay minerals with conductivity and enrichment of conductive minerals in certain areas.Reservoir quality has a negative correlation with resistivity.

关 键 词：孔隙结构 低幅构造 成因机制 低阻气层 沉积环境 须家河组 川东南地区 

分 类 号：TE122.1[石油与天然气工程—油气勘探]