川东南綦江丁山地区上奥陶统五峰组—下志留统龙马溪组页岩气地质条件综合评价

发布时间：2018-04-10 18:38

本文选题：地质特征 + 页岩气逸散　；参考：《地质论评》2017年01期

【摘要】：本文综合利用钻井、测井、地震及分析化验等资料,在对川东南綦江丁山地区DY1井、DY2井上奥陶统五峰组一下志留统龙马溪组页岩气层含气性分析基础上,探讨了各地质要素对气藏富集和产量的影响。结果表明:丁山地区页岩气地质条件好,具有TOC高、热演化程度适中、储集性能好、含气性较好等特点;构造样式是控制页岩气富集的一个重要因素,正向构造是四川盆地内最有利于页岩气富集的构造类型,而位于盆缘、靠近齐岳山断裂的丁山鼻状断背斜构造,同样有利于页岩气富集,但齐岳山断裂决定了其不同构造部位的含气性;在离齐岳山断裂距离较近、埋深较浅的构造部位,裂缝更加发育,页岩横、纵向渗透性增大,页岩气更容易发生大规模逸散,最终造成页岩气层含气性差。在此基础上,综合页岩埋深、构造特征,将丁山构造划分为浅埋平缓区、西部高角度斜坡区、中部低缓区、东部高角度斜坡区、深埋平缓区5个区带;以优质页岩厚度为基础,"构造与保存条件"为关键,并结合页岩埋深,优选出丁山地区中部低缓斜坡区为最有利区带。
[Abstract]:Based on the comprehensive use of drilling, logging, seismic and analytical data, and on the basis of gas bearing analysis of the shale gas reservoirs of the Upper Ordovician Wufeng formation and the Silurian Longmaxi formation in the Dingshan area of Qijiang River, southeastern Sichuan Province, this paper makes use of the analysis of the gas bearing capacity of the upper Ordovician Wufeng formation.The effects of various geological factors on the accumulation and production of gas reservoirs are discussed.The results show that the geological conditions of shale gas in Dingshan area are good, with high TOC, moderate thermal evolution, good reservoir performance and good gas content, and the structural style is an important factor controlling shale gas enrichment.The forward structure is the most favorable structural type for shale gas enrichment in Sichuan basin, while the Dingshan rhinocline structure near Qiyueshan fault, which is located at the basin margin, is also favorable for shale gas enrichment.However, the Qiyueshan fault determines the gas-bearing property of its different structural parts, and in the structural areas near the Qiyueshan fault and shallow buried depth, the fractures are more developed, the shale horizontal and longitudinal permeability is increased, and the shale gas is more likely to dissipate on a large scale.Finally, the gas bearing property of shale gas reservoir is poor.On this basis, according to the characteristics of shale buried depth and structure, the Dingshan structure is divided into five zones: shallow buried flat area, western high angle slope area, central low angle slope area, eastern high angle slope area and deep buried gentle zone.Based on the thickness of high quality shale, "structure and preservation conditions" as the key, and combining with the depth of shale, the most favorable zone is the low and gentle slope area in the middle of Dingshan area.
【作者单位】：中国石化勘探分公司;四川水利职业技术学院;
【基金】：中国石油化工股份有限公司科技部基础研究项目“川渝地区海相优质页岩气层形成主控因素及预测技术”(编号:P15074) 中国地质调查局地质调查项目“川东页岩气基础地质调查”(编号:12120115003901)的成果~~
【分类号】：P618.13

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