摘要
川东红星地区上二叠统吴家坪组海相富有机质页岩是四川盆地页岩气勘探的重要接替领域,目前已取得勘探突破,但如何实现规模增储、效益开发亟待攻关。基于岩石学、地球化学和含气性等测试分析资料研究了川东红星地区吴家坪组页岩源、储品质特征,探讨了优质储层发育控制因素。结果表明:吴家坪组页岩有机质类型较好,以Ⅱ1型干酪根为主,具有高TOC含量、高碳酸盐含量和高含气量的特征。页岩w(TOC)普遍介于1%~11%之间,均值6.89%;岩性以硅质页岩和混合页岩为主,其次为灰质页岩,整体脆性矿物含量较高;储层有机质孔发育且物性较好,孔隙度普遍介于2%~5%之间,均值3.1%。研究区富有机质页岩的分布明显受沉积环境的控制,火山活动、古气候以及古生产力共同影响了页岩中有机质的富集与分布。
[Objective]The organic-rich shale of the Upper Permian Wujiaping Formation in the Hongxing area of eastern Sichuan is an important replacement area for shale gas exploration in the Sichuan Basin,and the exploration breakthroughs have been made.But how to achieve large-scale storage increase and efficient development needs to be tackled.[Methods]This paper investigates the source and reservoir quality characteristics of the shale of the Wujiaping Formation in the Hongxing area of eastern Sichuan based on lithological,geochemical and gas-bearing test and analysis data and discusses the factors controlling the development of high-quality reservoirs.[Results]The results show that the shale of the Wujiaping Formation has a good organic matter type,dominated by type II 1 kerogen,with high TOC content,high carbonate content and high gas content.The shale TOC content generally ranges from 1%to 11%,with an average value of 6.89%;the lithology is mainly siliceous shale and mixed shale,followed by calcareous shale,and the overall brittle mineral content is high;the reservoir organic matter pores are developed and have good physical properties,and the porosity generally ranges from 2%to 5%,with an average value of 3.1%.Comprehensive analysis shows that the high-quality reservoir of the Wujiaping Formation is strictly controlled by the depositional environment.The reservoir pore type is dominated by organic pores.[Conclusion]Under the control of this depositional model,sea level rise and fall,volcanic activity and palaeoclimate have jointly controlled the inhomogeneity and high-quality shale reservior distribution.
作者
王必金
包汉勇
刘皓天
张莉
赵帅
Wang Bijin;Bao Hanyong;Liu Haotian;Zhang Li;Zhao Shuai(SINOPEC Jianghan Oilfield Company,Qianjing Hubei 433124,China;Exploration and Development Research Institute,SINOPEC Jianghan Oilfield Company,Wuhan 430074,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2023年第5期70-81,共12页
Bulletin of Geological Science and Technology
基金
中国石油化工股份有限公司科研项目“川东地区重点层系页岩气成藏条件与评价技术研究”(P23077)。
关键词
富有机质页岩
控制因素
吴家坪组
红星地区
四川盆地
organic-rich shale
control factor
Wujiaping Formation
Hongxing area
Sichuan Basin
