鄂西-渝东地区下侏罗统东岳庙段泥岩地球化学特征及有机质富集模式

发布时间：2018-01-15 02:05

本文关键词：鄂西-渝东地区下侏罗统东岳庙段泥岩地球化学特征及有机质富集模式　出处：《地球科学》2017年07期 　论文类型：期刊论文

【摘要】：我国不同地区页岩非均质性研究是亟待解决的基础地质问题,且四川盆地陆相页岩气的研究十分薄弱.通过对鄂西-渝东地区下侏罗统自流井组东岳庙段剖面和钻井岩心的岩石学特征、地球化学等方面的精细分析,结合测井曲线,查明了该层段地球化学垂向变化特征及有机质富集模式.结果表明,东岳庙段脆性矿物含量高,粘土矿物含量较少,下部有机质含量高于上部.地球化学指标所反映的古气候、古生产力、古氧化还原、古盐度表明东岳庙段垂向上具有明显差异;东岳庙段下部为干旱炎热古气候、贫氧-偏咸化水体和高古生产力,而东岳庙段上部为温暖湿润古气候、淡化水体和低古生产力,故东岳庙段下部更有利于有机质富集.
[Abstract]:The study of shale heterogeneity in different regions of China is a fundamental geological problem to be solved urgently. The study of continental shale gas in Sichuan basin is very weak. The petrological characteristics and geochemistry of the Dongyemiao section of the Lower Jurassic Ziliujing formation in the west of Hubei and eastern Chongqing are analyzed in detail. In combination with the log curves, the geochemical vertical variation characteristics and the enrichment model of organic matter in the formation have been found. The results show that the brittle mineral content is high and the clay mineral content is low in the Dongyemiao section. The content of organic matter in the lower part is higher than that in the upper part. The paleoclimate, paleo-productivity, paleo-redox and paleosalinity reflected by the geochemical index show obvious difference in the vertical direction of Dongyemiao section. The lower part of Dongyomiao section is arid and hot paleoclimate, which is poor in oxygen and brackish water and high paleoproductivity, while the upper part of Dongyemiao section is warm and humid paleoclimate, desalination of water body and low paleoproductivity. Therefore, the lower part of Dongyemiao section is more favorable for the enrichment of organic matter.
【作者单位】：中国地质大学构造与油气资源教育部重点实验室;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;澳大利亚联邦科学与工业研究院地球科学与资源工程学部;
【基金】：中国地质调查局油气基础性公益性地质调查项目(No.DD20160185) 国家重大油气专项(No.2016ZX05034-002-003)
【分类号】：P618.13
【正文快照】： 随着我国经济快速发展,石油及天然气等战略资源日益短缺,为了缓解能源问题,页岩油气等非常规油气资源成为石油工业的重要勘探领域和目标(邹才能等,2011;张东晓和杨婷云,2013;王道富等,2013;张毅等,2017).继北美页岩气的开采取得巨大成功之后,页岩油气迅速成为油气领域的勘探热

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