四川盆地复兴地区侏罗系凉高山组陆相页岩油气勘探突破及启示  

Breakthrough in the exploration of continental shale oil/gas of Jurassic Lianggaoshan Formation in the Fuxing area of the Sichuan Basin and its inspiration

作　　者：胡东风[1,2] 魏志红 魏祥峰[1,2] 石文斌 王道军[1,2] 刘晓晶 HU Dongfeng;WEI Zhihong;WEI Xiangfeng;SHI Wenbin;WANG Daojun;LIU Xiaojing(Sinopec Exploration Company,Chengdu,Sichuan 610041,China;State Key Laboratory of Shale Oil&Gas Enrichment Mechanisms and Effective Development,Beijing 102206,China)

机构地区：[1]中国石化勘探分公司 [2]页岩油气富集机理与高效开发全国重点实验室

出　　处：《天然气工业》2025年第1期1-13,共13页Natural Gas Industry

基　　金：中国石化科技部“十条龙”项目“涪陵地区侏罗系陆相页岩油气勘探评价技术”(编号:P21078-1);中国石化油田部重大导向项目“四川盆地及周缘新区新层系页岩油气勘探潜力评价与目标评选”(编号:YTBZD-FCZY-2023-1)。

摘　　要：近期,四川盆地复兴地区XY9井在侏罗系凉高山组湖相页岩段测试日产油10^(8).15 m^(3)、日产气1.58×10^(4)m^(3),继TY1井之后取得了四川盆地陆相页岩油气勘探新突破。为了深化陆相页岩油气富集高产因素认识,在分析总结复兴地区凉高山组页岩层系油气勘探历程和最新进展的基础上,基于岩心、地球化学、测井及地震等资料,系统分析了凉高山组陆相页岩沉积、储层及油气藏地质特征,研究了凉高山组陆相页岩油气富集高产的主要控制因素,明确了陆相页岩油气勘探突破的地质意义。研究结果表明:(1) XY9井凉高山组二段下亚段(以下简称凉二下亚段)上油气层是该区的主产层段,为半深湖相浅水区沉积,岩性为灰黑色页岩、灰黑色粉砂质页岩,页岩储层整体具有“无机孔为主、大孔大喉、孔缝一体”的孔缝储集体系特征。(2)凉二下亚段页岩总有机碳含量为1.27%、孔隙度为4.22%、含油率为2.76 mg/g,生产井油气同产,气油比为300~500 m^(3)/m^(3),平均原油密度为0.785 3 t/m^(3),为典型的挥发性页岩油藏。(3)凉二下亚段湖相暗色页岩具有“物性好、含油性高”特征,物质基础好;页岩顶底板岩石致密、生烃滞留率高和构造宽缓稳定,有利于页岩油气持续保存;粉砂纹层发育、脆性矿物含量高,是地质—工程双甜点层,有利于储层改造与油气高产。结论认为,复兴地区凉二下亚段陆相页岩油气资源潜力大,新一轮资源评价原油资源量为7.12×10^(8) t、天然气资源量为5 725×10^(8) m^(3),是四川盆地侏罗系凉高山组页岩油气重要的增储上产阵地。Recently,Well XY9 in the Fuxing area of the Sichuan Basin has obtained a daily oil production of 10^(8).15 m^(3) and a daily gas production of 1.58×10^(4) m^(3) during testing the lacustrine shale of Jurassic Lianggaoshan Formation,recording another breakthrough in the exploration of continental shale oil/gas in the Sichuan Basin after Well TY1.In order to further understand the enrichment and highyield factors of continental shale oil/gas,this paper reviews the history and latest progress of the Lianggaoshan Formation shale oil/gas exploration in the Fuxing area.Then,based on core,geochemical,logging and seismic data,the sedimentary,reservoir and petroleum geological characteristics of Lianggaoshan Formation continental shale are systematically analyzed,and the main factors controlling the enrichment and high yield of Lianggaoshan Formation continental shale oil/gas are studied.Finally,the geological significance of the breakthrough in continental shale oil/gas exploration is clarified.The following results are obtained.First,the upper oil/gas layers in the lower submember of the second member of Lianggaoshan Formation(hereinafter referred to as Lower Liang 2 Member)in Well XY9 are the main producing layers in this area,which are composed of shallow water deposits of semi-deep lake facies.The lithology is grayish black shale and grayish black silty shale.The shale reservoir exhibits the porous-fractured reservoir characteristics of inorganic pores as the dominant,large pores and large throats,and integrated pores and fractures.Second,the Lower Liang 2 Member shale has the total organic carbon content(TOC)of 1.27%,the porosity of 4.22%,and the oil content of 2.76 mg/g.The wells produce both oil and gas,with a GOR ranging from 300 m^(3)/m^(3) to 500 m^(3)/m^(3) and an average crude oil density of 0.7853 t/m^(3),making it a typical volatile shale reservoir.Third,the lacustrine dark shale of Lower Liang 2 Member has a good material foundation,with the characteristics of good physical properties and high oil content

关 键 词：四川盆地 复兴地区 XY9井 侏罗系 凉高山组 页岩油气 富集高产 勘探启示 

分 类 号：TE122[石油与天然气工程—油气勘探]