四川盆地东北部雷页1井上二叠统大隆组页岩气勘探突破及其启示  

Breakthrough of shale gas exploration in Dalong Formation of Upper Permian by Well Leiye 1 in the northeastern Sichuan Basin and its implications

作　　者：胡东风[1] 魏志红[1] 王威[2] 魏祥峰[1] 刘珠江[2] 陈斐然[2] 魏富彬 李飞[2] HU Dongfeng;WEI Zhihong;WANG Wei;WEI Xiangfeng;LIU Zhujiang;CHEN Feiran;WEI Fubin;LI Fei(Sinopec Exploration Company,Chengdu,Sichuan 610041,China;Geophysical Research Institute,Sinopec Exploration Company,Chengdu,Sichuan 610041,China)

机构地区：[1]中国石化勘探分公司 [2]中国石化勘探分公司物探研究院

出　　处：《天然气工业》2023年第11期28-39,共12页Natural Gas Industry

基　　金：国家自然科学基金企业创新发展联合项目“海相深层页岩源—储动态演化与页岩气富集规律研究”(编号:U19B6003-03-03);中国石油化工股份有限公司科技攻关项目“四川盆地二叠系海相页岩气富集高产主控因素及目标评价”(编号:P22136);“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优选”(编号:YTBXD-FCZY-2022-1-01-001)。

摘　　要：2023年3月,四川盆地东北部(以下简称川东北地区)普光地区首口二叠系页岩气专探井——雷页1井在上二叠统大隆组页岩分段压裂后测试获日产42.66×104 m3的高产气流,实现了四川盆地二叠系大隆组新层系页岩气勘探突破。为了进一步推进二叠系页岩气的勘探开发,应用雷页1井钻探资料,系统分析了普光地区大隆组海相页岩气成藏条件和富集高产主控因素。研究结果表明:①普光地区雷页1井大隆组发育深水陆棚相优质页岩,岩性主要为硅质页岩、混合硅质页岩及含灰硅质页岩,具有优质页岩厚度大(33 m)、总有机碳含量高(5.82%)、孔隙度高(3.46%)、含气量高(5.37 m^(3)/t)、脆性指数高(90.7%)的“一大四高”特征;②雷页1井大隆组具有“高脆、低黏”和低水平应力差(9 MPa)特征,页岩可压性好;③研究区“厚层膏岩披覆+断层分层滑脱型”高陡构造区保存条件好,页岩气勘探潜力大。结论认为:①该区深水陆棚相优质页岩是大隆组页岩气富集的物质基础,“厚被子”膏岩披覆、顶底板条件及断层封闭性好是二叠系页岩气“超压富气”的关键;②开江—梁平陆棚大隆组、吴家坪组二段和茅口组三段3套优质页岩叠置连片发育,具备良好的立体勘探开发潜力;③基于雷页1井探索形成的二叠系海相深层页岩“穿层扩体”压裂技术,能产生大体积高导流的复杂裂缝系统,该技术可为复杂岩相页岩储层改造提供技术借鉴。In March,2023,Well Leiye 1,the 1st Permian shale gas exploration well in the Puguang area of the northeastern Sichuan Basin obtained high-yield shale gas from the Upper Permian Dalong Formation at the rate of 42.66×104 m3/d after staged fracturing,which marks a great breakthrough in shale gas exploration in the new layers of Permian Dalong Formation in the Sichuan Basin.In order to further promote the exploration and development of Permian shale gas,this paper systematically analyzes the accumulation conditions and enrichment and high yield controlling factors of the Dalong Formation marine shale gas in Puguang area based on the drilling data of Well Leiye 1.And the following research results are obtained.First,in the Dalong Formation in Well Leiye 1 develops quality shale of deep shelf facies,whose lithology is dominated by siliceous shale,mixed siliceous shale and limy siliceous shale.It is characterized by great quality shale thickness(33 m),high TOC(5.82%),high porosity(3.46%),high gas content(5.37 m3/t),and high brittleness index(90.7%).Second,the Dalong Formation in Well Leiye 1 is characterized by high brittleness,low viscosity and low difference of horizontal stress(9 MPa),so the shale has good fracability.Third,the steep structural zone with thick gypsum caprocks and layered fault detachment in the study area has good preservation conditions for and great potential of shale gas exploration.In conclusion,the quality shale of deep shelf facies in this area provides a material foundation for the enrichment of shale gas in the Dalong Formation,and thick gypsum caprocks,good floor and roof conditions and great fault sealing capacity are the key factors for the overpressure enrichment of shale gas in the Permian.What's more,in the Kaijiang-Liangping continental shelf,three sets of quality shale(Dalong Formation,the second Member of Wujiangping Formation and the third Member of Maokou Formation)are developed continuously in a superimposed pattern,so it has great potential in stereoscopic exploration and develo

关 键 词：四川盆地东北部 雷页1井 上二叠统 大隆组 页岩气 富集高产 

分 类 号：P618.13[天文地球—矿床学]