重庆万州地区侏罗系泥页岩储层特征——以万成寨剖面为例  

Characteristics of Jurassic shale reservoirs in Wanzhou area,Chongqing:A case study of Wanchengzhai section

作　　者：刘备 周向辉 陈绵琨[2] 许露露 刘早学 张焱林 居字龙 Liu Bei;Zhou Xianghui;Chen Miankun;Xu Lulu;Liu Zaoxue;Zhang Yanlin;Ju Zilong(Hubei Geological Survey,Wuhan 430034,China;Research Institute of Exploration and Development,Jianghan Oilfield Company,Sinopec,Wuhan 430223,China)

机构地区：[1]湖北省地质调查院,湖北武汉430034 [2]中国石化江汉油田分公司勘探开发研究院,湖北武汉430223

出　　处：《资源环境与工程》2025年第2期121-130,共10页Resources Environment & Engineering

基　　金：中国石化江汉油田分公司科技项目(3140032-22-ZC0613-0028);湖北省自然科学基金一般面上项目(2022CFB420)。

摘　　要：通过野外地质剖面测量、有机地球化学、X衍射、扫描电镜和物性分析等方法,对重庆市万州区万成寨剖面侏罗系泥页岩储层进行研究。结果表明,侏罗系下统自流井组东岳庙段、大安寨段和侏罗系中统凉高山组凉二段富有机质泥页岩发育,厚度分别为62.5、75.1和127.5 m,总有机碳(TOC)含量平均值分别为2.18%、1.42%和1.37%,有机质类型以Ⅱ型为主,处于成熟—高成熟演化阶段;东岳庙段、大安寨段和凉二段矿物组成以黏土矿物和石英为主,脆性指数分别为54.1%、54.6%和49.2%;东岳庙段泥页岩以粒间孔和粒内溶蚀孔为主要储集空间,大安寨段以粒间孔和微裂缝为主,而凉二段则以有机质孔和粒内溶蚀孔为主。三套地层均表现为低孔、低渗特性,其中凉二段储集性能较差,而东岳庙段和大安寨段储集性能相对较好。综合分析认为,重庆万州地区侏罗系东岳庙段和凉二段泥页岩储层条件相对优于大安寨段,显示出良好的页岩油气勘探潜力。The Jurassic shale reservoirs in the Wanchengzhai section of the Wanzhou area,Chongqing,were investigated using methods such as field geological profile measurement,organic geochemistry,X-ray diffraction,scanning electron microscopy,and physical property analysis.The results show that,Dongyuemiao and Da'anzhai Members of Ziliujing Formation of Lower Jurassic,and Member 2nd of Lianggaoshan Formation of Middle Jurassic are the best-developed layers of organic-rich shales,with thicknesses of 62.5 m,75.1 m,and 127.5 m,respectively.The average total organic carbon(TOC)content in these intervals is 2.18%,1.42%,and 1.37%,respectively,and the type of organic matter is dominated by type II,which is in the stage of maturity-high maturity evolution.The mineral composition of the Dongyuemiao Member,the Da'anzhai Member and the Member 2nd of Lianggaoshan Formation is dominated by clay and quartz,with brittleness indices of 54.1%,54.6%,and 49.2%,respectively.In terms of reservoir space,the Dongyuemiao Member is characterized by intergranular pores and intragranular dissolution pores,the Da'anzhai Member by intergranular pores and microfractures,and the Member 2nd of Lianggaoshan Formation primarily by organic matter pores and intragranular dissolution pores.These three formations generally exhibit low porosity and low permeability.Among them,the Member 2nd of Lianggaoshan Formation has the poorest reservoir quality,while the Dongyuemiao and Da'anzhai Members exhibit relatively better reservoir potential.A comprehensive analysis indicates that the shale reservoir conditions of the Dongyuemiao Member and the Member 2nd of Lianggaoshan Formation within the Jurassic strata of the Wanzhou area,Chongqing,are superior to those of the Da'anzhai Member.These formations exhibit substantial potential for shale oil and gas exploration.

关 键 词：页岩 侏罗系 储层特征 重庆地区 

分 类 号：P618.13[天文地球—矿床学]