四川盆地东缘白马地区常压页岩气开发地质评价  

Development geology avaluation of normal-pressured shale gas in the Bai-ma area,eastern margin of the Sichuan Basin

作　　者：刘超[1] 包汉勇[1] 万云强[1] LIU Chao;BAO Hanyong;WAN Yunqiang(Research Institute of Exploration and Development,Jianghan Oilfield Branch Company,SINOPEC,Wuhan 430223,China)

机构地区：[1]中国石油化工股份有限公司江汉油田分公司勘探开发研究院,武汉430223

出　　处：《地质科技通报》2024年第4期53-61,共9页Bulletin of Geological Science and Technology

基　　金：中国石油化工股份有限公司科技项目“白马区块常压页岩气富集高产机理与目标评价”(P21087-1)。

摘　　要：涪陵气田是我国第一个实现商业开发的页岩气田,近几年年产气量稳定在70亿m^(3)以上,开发效果良好。随着开发需求不断增大,开发对象由焦石坝等高压页岩气藏逐步转向了白马常压页岩气藏。2021年白马地区提交探明储量1048.83亿m^(3),地质资源基础得到夯实,而开发地质评价与目标优选是实现储量有效动用第一环。以分析化验、测井解释、地震预测、压裂试气资料为基础,开展白马地区常压页岩气开发有利层段与有利目标评价研究。研究结果表明,白马地区奥陶系五峰组-志留系龙马溪组发育深水陆棚相富有机质页岩,其中深水陆棚硅质页岩是开发最有利层段。明确了地层压力系数、孔隙度、天然裂缝、应力性质是常压页岩气开发地质评价的关键参数。以此为基础,建立了白马常压页岩气藏开发选区地质参数体系,优选白马向斜南部为开发建产第一目标,实现了规模效益建产,对常压页岩气开发具有重要借鉴意义。[Objective]The Fuling Gas Field as the first commercial shale gas field in China has stably achieved an annual gas production of over 7 billion cubic meters in recent years,which is a good development result.With the increasing demand for development,the development targets have gradually shifted from the high-pressured shale gas reservoirs,e.g.,the Jiaoshiba region,to the normal-pressured shale gas reservoirs of the Baima region.In 2021,the Baima area submitted a proven reserve of 104.883 billion cubic meters,consolidating its geological resource foundation.Development geology evaluation and target optimization are the first steps to efficiently achieve the utilization of reserves.[Methods]Based on core testing,well logging interpretation,seismic prediction,and gas testing data,the favourable intervals and targets for the development of normal-pressured shale gas in the Baima area were evaluated in this study.[Results]The research results indicate that the organic-rich shale of the Ordovician Wufeng Formation and Silurian Longmaxi Formation in the Baima area was deposited on the deep-water shelf.Thereinto,the deep-water shelf siliceous shale is the most favourable layer for development.The key parameters for the development geology evaluation of normal-pressured shale gas include the formation pressure coefficient,porosity,natural fractures,and stress properties.[Conclusion]A geological parameter system has been established for the development of target areas,which suggests that the southern part of the Baima Syncline can be selected as the first target for development and production.The Baima Region has achieved large-scale economic production and can be an important reference for the development of normal-pressured shale gas.

关 键 词：白马地区 页岩气 常压 开发地质 奥陶系五峰组-志留系龙马溪组 深水陆棚硅质页岩 

分 类 号：P618.13[天文地球—矿床学]