四川盆地中北部大安寨段油气勘探前景  

Petroleum exploration prospect of Lower Jurassic Da'anzhai Member,north-centre of Sichuan Basin,China

作　　者：孙玮[1] 李智武[1] 张葳[1] 冯逢[2] 张萌[1] 武文慧[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]中国石油西南油气田分公司川中油气矿,四川遂宁629000

出　　处：《成都理工大学学报（自然科学版）》2014年第1期1-7,共7页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：成都理工大学"油气地质地球物理勘探科研优秀创新团队"基金资助项目(KYTD201205);国家自然科学基金资助项目(40739907)

摘　　要：利用沉积、构造研究分析四川盆地中北部下侏罗统自流井组大安寨段的油气地质特征,探讨其勘探前景.通过华蓥山地区野外露头剖面结合钻井岩心、测井与地震资料分析大安寨段沉积相纵向和平面展布特征,利用分层数据恢复古构造的方法.结果表明大安寨段主要是深湖-半深湖相沉积,其中主要的储层段半深湖介壳滩相主要分布在盆地的中部及东北部地区.大安寨段属于典型的自生自储油藏,其下段黑色页岩为源,页岩平均厚达45 m,R.为1.29％～1.66％,ωTOC平均为1.19％,埋深一般为1.2～2.5 km.川中东北部大安寨段油气油藏具有近源充注、持续供给、连续成藏、裂缝性孔隙储层、岩性-构造圈闭控藏的特征,因此不仅具有较好的常规油藏的勘探前景,页岩油勘探也具有一定的潜力.By use of deposition and tectonic research this paper analyses the characteristics of petroleum geology of Da＇anzhai Member of Lower Jurassic Ziliujing Formation in the north-centre of Sichuan Basin and explores the exploration prospect.Through observating the outcrop section in the Huayingshan region and combined with the analysis of drilling cores,well logs and seismic data,this paper analyses the vertical and flat distribution characteristics of Da＇anzhai Member sedimentary facies and uses the method of the stratified data to recover the paleostructure.The results show that Da＇anzhai Member mainly involves deep-lake facies and half-deep-lake facies.The main reservoir bed is the half-deep-lake shell beach facies chiefly in the north and the northeast of the basin.The Da＇anzhai Member belongs to a typical self-generated and self-accumulated oil pool,and more exactly,the black shale in the lower sector is the source rock.The Da＇anzhai black shale has an average thickness of 45m and is buried in the depth of 1.2～2.5 km.ItsRois 1.29％～1.66％ and its fraction of TOC is about 1.19％.The Da＇anzhai Member oil and gas pool in the northeast of Central Sichuan has the characters of proximal filling,continuous supply,continuous accumulation,fractured porous reservoir and litho-structural trap controlling oil and gas accumulation.So it has an exploration prospect with better conventional oil accumulation and some potential for shale oil exploration.

关 键 词：大安寨段 页岩油气 四川盆地 

分 类 号：TE132.11[石油与天然气工程—油气勘探]