摘要
四川盆地普光气田的陆相页岩气风险井普陆页1井在侏罗系千佛崖组半深湖亚相页岩气层中试气获得10.4×10^(4)m^(3)/d的高产工业气流、试采稳产天然气达到6×10^(4)m^(3)/d,实现了四川盆地千佛崖组陆相页岩气勘探的重大突破。基于普陆页1井的系统取心及测试结果,对比分析全盆地同层位的研究认识,探讨了侏罗系页岩油气富集的主控因素及模式,指出了四川盆地侏罗系页岩气的下一步重点勘探方向。通过“盆山耦合地层对比—界面识别地层划分—工区系统取心锚定”,明确了中侏罗世早期存在盆地性质的转换(坳陷湖盆—前陆盆地);在“北气南油”的油气藏分布格局下,中侏罗统千佛崖组发育“双复杂”型的非常规油气“箱体”;建立了前陆盆地陆相页岩油气二元差异的富集模式,并特别指出通江—普光—开县以北的地区(通江生气中心)为侏罗系陆相页岩气勘探开发的战略区块,其资源量可达3.3×10^(12)m^(3)。依据勘探实践,初步提出四川盆地千佛崖组湖相富壳质组页岩的生烃模式为在镜质体反射率(R_(o))>2.0%时仍然可能处于生油气窗口,0.7%≤R_(o)≤2.2%可作为陆相页岩油气勘探的现实领域。这极大地扩展了陆相页岩油气的勘探空间。
Well Puluye1(PLY1),the continental shale gas risk well,has obtained a high industrial natural gas production of 10.4×10^(4)m^(3)/d in the semi-deep lacustrine subfacies shale gas reservoir of the Jurassic Qianfoya Formation in Puguang gas field,Sichuan Basin,and also stable natural gas yield of 6.0×10^(4)m^(3)/d in the pilot production stage,achieving a major breakthrough in the exploration of continental shale gas in Qianfoya Formation,Sichuan Basin.Based on the systematic coring and testing results of Well PLY1 and the comparative analysis of understandings in research of the same formations in the whole basin,the paper explores the main controlling factors and models for the enrichment of Jurassic shale oil and gas,and points out the key exploration directions of Jurassic shale gas in Sichuan Basin.Through basin-mountain coupled formation correlation,boundary identification and formation division,and systematic coring and anchoring in work area,the transition(from depressional lake basin to foreland basin)of basin properties in the Early-Middle Jurassic has been clarified;under the reservoir pattern of gas in the north and oil in the south,the Middle Jurassic Qianfoya Formation develops a “double complex” type unconventional oil-gas box;a binary differential enrichment model of continental shale oil and gas in the foreland basin has been established,and it is particularly pointed out that the north area of Tongjiang-Puguang-Kaixian(Tongjiang gas generating center)is a strategic block for the exploration and development of Jurassic continental shale gas,possessing the hydrocarbon resource of 3.3×10^(12)m^(3).Based on the exploration practice,it is preliminarily proposed that the hydrocarbon generation pattern of lacustrine exinite-rich shale in Qianfoya Formation of Sichuan Basin is still be in oil-gas generation window when vitrinite reflectance(R_o) is over 2.0%,and 0.7%≤R_o≤2.2% indicates the real field of continental shale oil-gas exploration,which greatly expands the exploration space of contine
作者
张洪安
彭君
王学军
李进
Zhang Hongan;Peng Jun;Wang Xuejun;Li Jin(Sinopec Zhongyuan Oilfield Company,Henan Puyang 457000,China;Exploration Department,Sinopec Zhongyuan Oilfield Company,Henan Puyang 457000,China;Exploration and Development Research Institute,Sinopec Zhongyuan Oilfield Company,Henan Puyang 457000,China)
出处
《石油学报》
EI
CAS
CSCD
北大核心
2023年第9期1500-1516,1551,共18页
Acta Petrolei Sinica
基金
中国石油化工股份有限公司项目“中原探区陆相侏罗系页岩气勘探开发关键技术”(P21111)
中国石油化工集团有限公司项目“普光侏罗系陆相页岩凝析气藏有效开发技术”(P23202)资助。
关键词
前陆盆地
箱体
二元差异富集
通江生气中心
富壳质组页岩生烃
foreland basin
box
binary differential enrichment
Tongjiang gas generating center
hydrocarbon generation from ex-inite-rich shale
