摘要
针对川东北地区下侏罗统自流井组大安寨段陆相页岩储层非均质性强,岩性变化快,岩相类型复杂,页岩黏土矿物含量高等问题,结合川东北地区已有成果资料、岩心观察描述、扫描电镜、CO_(2)吸附、N_(2)吸附和高压压汞孔径联合实验分析结果,对研究区自流井组大安寨段进行储层定量表征综合研究。结果表明,研究区主要发育岩相为富有机质纹层状混合质页岩、富有机质块状黏土质页岩、含有机质纹层状混合质页岩、含有机质层状黏土质页岩、含有机质纹层状硅质页岩和贫有机质纹层状混合质页岩,总计6种岩相;主要发育孔隙类型为:有机质孔隙、粒间孔隙和粒内孔隙,不同岩相类型中,富有机质纹层状混合质页岩孔隙发育类型最多、孔数量发育最多且孔隙连通性良好;微孔体积为0.0014~0.0026 cm^(3)/g,平均为0.002 cm^(3)/g;中孔体积为0.0075~0.0166 cm^(3)/g,平均为0.0123 cm^(3)/g;宏孔体积为0.0578~0.2105 cm^(3)/g,平均0.1221 cm^(3)/g;微孔比表面积为4.52~9.82 cm^(2)/g,平均为6.74 cm^(2)/g;中孔比表面积为3.41~13.87 cm^(2)/g,平均为8.73 cm^(2)/g;宏孔比表面积为0.04~0.48 cm^(2)/g,平均为0.13 cm^(2)/g;储集能力最优质的岩相是富有机质纹层状混合质页岩。
The continental shale reservoirs in the Da′anzhai Member of the Lower Jurassic Ziliujing Formation in the northeastern Sichuan Basin have strong heterogeneity,rapid lithology changes,complex lithofacies types,and high content of clay minerals in shale.Combined with the existing results in northeastern Sichuan,core observation and description,scanning electron microscope,CO_(2) adsorption,N_(2) adsorption and high-pressure mercury intrusion aperture combined experimental analysis results,a comprehensive study of reservoir quantitative characterization was carried out in the Da′anzhai Member of the Ziliujing Formation in the study area.The results showed that the main lithofacies developed in the study area are organic-rich lamellar mixed shale,organic-rich massive clay shale,organic-rich lamellar mixed shale,organic-rich layered clay shale,organic-rich lamellar mixed shale,organic-rich lamellar mixed shale,laminated siliceous shale and organic-poor laminar mixed shale,a total of 6 lithofacies;the main developed pore types were:organic pores,intergranular pores and intragranular pores.Among different lithofacies types,organic-rich lamellae layered mixed shale had the most types of pores,the largest number of pores and good pore connectivity;the volume of micropores was 0.0014~0.0026 cm^(3)/g,with an average of 0.002 cm^(3)/g;the volume of mesopores was 0.0075~0.0166 cm^(3)/g,the average was 0.0123 cm^(3)/g;the macropore volume was 0.0578~0.2105 cm^(3)/g,the average was 0.1221 cm^(3)/g;the micropore specific surface area was 4.52~9.82 cm^(2)/g,with an average of 6.74 cm^(2)/g;the mesopore specific surface area was 3.41~13.87 cm^(2)/g,with an average of 8.73 cm^(2)/g;the macropore specific surface area was 0.04~0.48 cm^(2)/g,with an average of 0.13 cm^(2)/g;the lithofacies with the best storage capacity were organic-rich laminar mixed shale.
作者
李维邦
姜振学
仇恒远
朱德宇
曹香妮
苏展飞
杨占伟
Li Weibang;Jiang Zhenxue;Qiu Hengyuan;Zhu Deyu;Cao Xiangni;Su Zhanfei;Yang Zhanwei(State Key Laboratory of Oil and Gas Resources and Exploration,China University of Petroleum(Beijing),Beijing 102249,China;Institute of Unconventional Oil and Gas Science and Technology,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《能源与环保》
2022年第1期143-153,共11页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家科技重大专项项目(2016ZX05034-001-005)
陆相页岩储层岩石组构和孔隙结构特征及其对含气性的控制机理(41872135)。
关键词
川东北地区
大安寨段
陆相页岩储层
孔隙结构
储集能力
Northeast Sichuan Basin
Da′anzhai Member
ontinental shale reservoir
pore structure
reservoir capacity
