宣汉—巫溪地区五峰组—龙马溪组黑色页岩生物地层特征及分层对比

发布时间：2018-01-20 01:10

本文关键词： 四川盆地宣汉—巫溪地区页岩气笔石带序列晚奥陶世—早志留世生物地层分层对比巫溪井　出处：《天然气工业》2017年07期 　论文类型：期刊论文

【摘要】：要实现我国"十三五"页岩气产量发展目标(2020年年产300×10~8 m~3),亟需寻找新的页岩气勘探开发有利区。四川盆地东部宣汉—巫溪页岩气矿权区块具有良好的页岩气勘探开发潜力,为进一步分析该区上奥陶统五峰组—下志留统龙马溪组海相页岩地层的发育特征,通过对巫溪、田坝等剖面的野外地质踏勘,TOC、含气量等分析化验,古生物化石鉴定和精细地层对比,得出了巫溪和涪陵一带同属一个沉积中心、巫溪地区TOC2%的富有机质页岩累计厚度超过90 m的认识。进而针对该区五峰组—龙马溪组黑色页岩层系难以区分的难题,根据区域地层特征和笔石带序列对复杂构造区典型井——巫溪2井的页岩储层进行了精细划带,确定了8个笔石带,即五峰组的WF2笔石带—龙马溪组LM9笔石带。结论认为:该区生物地层基本稳定,优质页岩主要位于WF2(Dicellograptus complexus)—LM6(Demirastrites triangulatus)笔石带,但同时在大巴山南缘优质页岩的横向分布仍存在着不稳定性。
[Abstract]:In order to realize the development target of shale gas production in the 13th Five-Year Plan of China (in 2020, the annual output is 300 脳 10 ~ (8) m ~ (3)). It is urgent to find new favorable areas for shale gas exploration and development. The Xuanhan-Wuxi shale gas mining right block in the east of Sichuan basin has good potential for shale gas exploration and development. In order to further analyze the developmental characteristics of marine shale strata in the upper Ordovician Wufeng formation and Lower Silurian Longmaxi formation, the gas content and gas content of Wuxi and Tianba sections were analyzed and tested. The identification of paleontological fossils and the fine stratigraphic correlation show that both Wuxi and Fuling belong to the same sedimentary center. It is recognized that the accumulative thickness of organic shale in Wuxi area is more than 90 m, and the black shale formation of Wufeng formation and Longmaxi formation is difficult to distinguish. According to the regional stratigraphic characteristics and graptolite sequence, the shale reservoir of the typical well Wuxi 2 in the complex structural area has been carefully zoned, and 8 graptolite zones have been determined. This is the WF2 graptolite belt of the Wufeng formation and the LM9 graptolite belt of the Longmaxi formation. The conclusion is that the biostratigraphy in this area is basically stable. High quality shale is mainly located in WF2(Dicellograptus complexus)-LM6(Demirastrites Triangulatus. Graptolite belt. At the same time, there is still instability in the lateral distribution of high quality shale in the southern margin of Daba Mountain.
【作者单位】：中国石油勘探开发研究院;国家能源页岩气研发(实验)中心;中国石油西南油气田公司重庆气矿;
【基金】：国家重点基础研究发展计划(973计划)项目“中国南方海相页岩气高效开发的基础研究”(编号:2013CB228000) 国家“十三五”重大专项“四川盆地及周缘页岩气形成富集条件、选区评价技术与应用”(编号:2017ZX05035)
【分类号】：P618.13;Q911
【正文快照】： 近几年,随着四川盆地及其周缘的威远、长宁、涪陵、昭通、富顺—永川、彭水和丁山等页岩气区块相继投入开发,中国的页岩气勘探进入快速发展阶段[1-4],2016年累计生产页岩气78×108 m3。2014年由中国石油勘探开发研究院实施的地质资料井——巫溪2井的页岩气勘探取得了较好的效

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