柴北缘侏罗系页岩气成藏特征与资源潜力评价

发布时间：2019-01-09 10:14

【摘要】：柴达木盆地北缘是青海省最重要的含煤盆地,其侏罗系富含有机质泥岩地层发育厚度大,有机质成熟度好,具备良好的页岩气地质条件。对柴北缘页岩气地质条件进行系统研究,估算其资源量,对进一步页岩气勘探开发工作的部署,有较好的指导意义。对青海省能源结构调整及缓解能源压力都将发挥积极作用。本文以《青海省页岩气资源战略调查与选区》课题项目为依托,在掌握柴北缘区侏罗系地层区域地质背景的基础上,分析侏罗系富有机质暗色泥页岩生烃条件、储集保持条件及含气性特征,进行资源量估算和有利勘探区优选。本文对以往钻孔资料的收集和分析的基础上认为下三角洲平原的分流间湾以及三角洲前缘、滨湖、浅湖、半深湖环境是泥页岩形成的有利环境。大量钻孔和地震数据表明,柴北缘冷湖地区泥页岩厚度大于1000m,团鱼山、鱼卡、大煤沟等地泥岩厚度可达100m～500m。有机质演化程度多为低成熟—成熟水平;冷湖地区TOC含量约3.0%,团鱼山、鱼卡、大煤沟等地的Toc含量1.0%～3.0%,都达到了好烃源岩标准。通过储层脆性矿物特征具,“高硅质、高粘土、低碳酸盐”的特点,储集空间类型发育,含气显示明显,具备良好的页岩气开发条件。通过体积法,对页岩气源量进行了估算。利用TOC相关法获取了研究区侏罗系泥页岩含气量。经计算,得出柴北缘地区侏罗系页岩气地质资源量为9817.6亿m3,结合泥岩厚度、泥岩所在地层的埋深、有机碳含量、热演化程度、地表条件等有利区选取标准,选取了柴北缘冷湖三号、冷湖四号地区、鱼卡、团鱼山、大煤沟、绿草山、大头羊、为页岩气有利勘探区。
[Abstract]:The northern margin of Qaidam Basin is the most important coal-bearing basin in Qinghai Province. Its Jurassic mudstone rich in organic matter has a large thickness and maturity of organic matter, and has good shale gas geological conditions. The geological conditions of shale gas in the northern margin of Qaidam are studied systematically, and the amount of shale gas resources is estimated, which is of great significance for the deployment of further exploration and development of shale gas. Qinghai energy structure adjustment and relief of energy pressure will play a positive role. Based on the project of "Strategic investigation and selection of Shale Gas Resources in Qinghai Province", and on the basis of understanding the regional geological background of Jurassic strata in the northern margin of Qaidam, this paper analyzes the hydrocarbon generation conditions of Jurassic organic matter rich dark mud shale. Reservoir preservation conditions and gas-bearing characteristics, resource estimation and favorable exploration area selection. Based on the collection and analysis of the previous drilling data, it is considered that the interdistributary bay of the lower delta plain and the delta front, littoral, shallow and semi-deep lacustrine environments are the favorable environment for shale formation. A large number of boreholes and seismic data show that the thickness of shale is more than 1000m in the Lenghu area of the northern margin of Qaidam, and the thickness of mudstone in Tuanyushan, Yuka and Dahuagou can reach 100m / 500m. The evolution degree of organic matter is mostly low mature level, the TOC content in Lenghu area is about 3.0 and the Toc content in Tuanyushan, Yuka, Dachaigou and other places has reached the standard of good hydrocarbon source rock. Through the characteristics of brittle mineral, "high siliceous, high clay and low carbonate", the reservoir space type is developed, the gas content is obvious, and the development condition of shale gas is good. The shale gas source is estimated by volume method. The gas content of Jurassic shale was obtained by TOC correlation method. By calculation, the geological resources of Jurassic shale gas in the northern margin of Qaihai are 981.76 billion m3, combining with the thickness of mudstone, the buried depth of the mudstone, the content of organic carbon, the degree of thermal evolution, the surface condition, and so on. Lenghu No.3, Lenghu No.4, Yuka, Tuanyushan, Dachaigou, Lucaoshan and Datouyang in northern margin of Qaihai are selected as favorable exploration areas for shale gas.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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