陆相页岩气形成条件及勘探开发潜力——以川东涪陵北地区侏罗系东岳庙段为例  

Formation conditions and exploration and development potential of continental shale gas:a case of Dongyuemiao Member of the Jurassic in north Fuling area,eastern Sichuan Basin

作　　者：刘皓天[1] 李雄[1] 万云强[2] 刘忠宝[3] 周林[1] 车世琦 LIU Haotian;LI Xiong;WAN Yunqiang;LIU Zhongbao;ZHOU Lin;CHE Shiqi

机构地区：[1]中国石化江汉油田分公司勘探开发研究院 [2]中国石化江汉油田分公司 [3]中国石化勘探开发研究院

出　　处：《海相油气地质》2020年第2期148-154,共7页Marine Origin Petroleum Geology

基　　金：国家科技重大专项下属专题“中扬子页岩气潜力分析与目标评价”(编号:2017ZX05036-003-008)资助。

摘　　要：陆相泥页岩是页岩气勘探开发的重要接替领域。利用四川盆地涪陵北地区最新钻井(FY10井)资料及大量样品的分析测试结果,从页岩矿物组成、有机地球化学特征、储集特征、含气性等方面研究了侏罗系自流井组东岳庙段页岩气形成条件与勘探潜力。研究结果表明:研究区东岳庙段一亚段优质页岩厚度大于20 m,有机质含量较高(TOC为1.31%~4.04%,平均值大于1.5%),有机质类型以Ⅱ型为主,有机质已进入高成熟演化阶段;页岩中无机矿物孔与有机质孔均较发育,平均孔隙度大于4%,储集性能好;岩心浸水实验显示气泡密集、持续性好,页岩气形成与富集条件好;东岳庙段整体埋藏深度适中,页岩中发育大量灰质介壳纹层,有利于增强压裂改造效果,因此具备良好的页岩气勘探开发潜力。Continental shale is an important succeeding field of shale gas exploration and development.The formation conditions and exploration potential of shale gas in Dongyuemiao Member of the Lower Jurassic Ziliujing Formation are analyzed on the aspects of mineral composition,organic geochemistry,reservoir characteristic and gas content from the latest drilling data(Well FY10).The results show that the Dongyuemiao Submember 1 in the study area has higher organic matter content(TOC at range of 1.31%~4.04%with average value more than 1.50%)with thickness more than 20 m of high-quality shale,and the organic matter type is mainly typeⅡwith high thermal maturity.Both of the inorganic and organic pores are developed in the shale,and the average porosity is more than 4%,which indicates good reservoir properties of the shale.The water immersion test of core shows that the shale gas bubbles are dense and persistent,which indicates good formation and enrichment conditions of shale gas.The burial depth of the Dongyuemiao Member in the study area is moderate,and the shale contains a large amount of calcareous shell laminae to improve the fracturing effect,which reveals good potential for shale gas exploration and development.

关 键 词：陆相泥页岩 页岩气 勘探潜力 东岳庙段 侏罗系 四川盆地 

分 类 号：TE132.2[石油与天然气工程—油气勘探]