江西省富有机质页岩岩石学特征与页岩气富集

发布时间：2018-05-03 14:35

本文选题：富集规律 + 富集模式　；参考：《中国矿业大学》2015年硕士论文

【摘要】：通过野外地质剖面实测和室内X衍射全岩定量分析、有机显微组分分析、扫描电镜分析、有机碳分析等实验测试方法,以江西省赣东北地区上震旦统皮园村组和下寒武统荷塘组、赣西北地区下寒武统王音铺组和观音堂组、萍乐坳陷上二叠统乐平组和上三叠统安源组为目的层系,分析了泥页岩的总有机碳含量、有机质类型、有机质成熟度等有机岩石学特征,和矿物组成、矿物形态、孔隙特征和岩石结构构造等岩石学基本特征,发现江西省富有机质页岩总有机碳含量高(普遍2%)、有机质类型以I型为主、有机质成熟度属于成熟—过成熟阶段、矿物组分以石英矿物和粘土矿物为主,微孔隙发育,具备页岩气形成的良好物质基础。在此基础上,分析了岩石学特征对孔隙特征、甲烷最大吸附量、成藏机理和可采条件的影响,发现石英矿物、粘土矿物含量对孔渗特征有不同程度的影响;成岩作用是孔隙类型形成的关键因素;影响甲烷最大吸附气含量诸多因素的控制程度中总有机碳含量粘土矿物含量有机质成熟度脆性矿物含量,成岩作用过程中矿物成分间的转化、孔隙演化、液态烃的吸附作用均对页岩气的赋存机理有一定的影响;“生—储—盖”层岩性组合特征是页岩气保存条件的重要制约因素,江西省页岩气的赋存条件和保存条件整体良好,而萍乐坳陷页岩气保存条件相对较差。最后,归纳了江西省页岩气的富集模式和富集规律,发现江西省页岩气富集模式主要分为滨海相高演化高有机质丰度富集模式、深海盆地相高演化高有机质丰度富集模式、浅海陆棚相低演化低有机质丰度富集模式,前两种页岩气富集模式下的页岩气生烃潜力更好;封闭稳定的沉积环境、高演化程度、高有机质丰度和较好的孔隙发育程度均有利于页岩气的富集。
[Abstract]:Through field geological profile measurement and indoor X-ray diffraction quantitative analysis of rock, organic maceral analysis, scanning electron microscope analysis, organic carbon analysis and other experimental test methods, The target strata are the Piyuancun formation of Upper Sinian and the Hetang formation of Lower Cambrian in northeast Jiangxi Province, the Wangyinpu formation and Guanyintang formation of Lower Cambrian in Northwest Jiangxi, the Leping formation of Upper Permian and Anyuan formation of Upper Triassic in Pingle Depression. The basic characteristics of organic petrology, such as total organic carbon content, organic matter type, maturity of organic matter, mineral composition, mineral morphology, pore characteristics and rock structure, are analyzed. It is found that the total organic carbon content of organic matter rich shale in Jiangxi Province is high (2%), the type of organic matter is mainly type I, the maturity of organic matter belongs to mature-over-mature stage, the mineral component is mainly quartz and clay minerals, and the micropores are developed. It has a good material base for shale gas formation. On this basis, the effects of petrological characteristics on pore characteristics, maximum adsorption capacity of methane, reservoir formation mechanism and recoverable conditions are analyzed. It is found that the content of quartz minerals and clay minerals have different effects on the pore and permeability characteristics. Diagenesis is the key factor in the formation of pore types, and the total organic carbon content, clay mineral content, organic matter maturity and brittle mineral content in the controlling degree of many factors affecting the maximum methane adsorption gas content, In the process of diagenesis, the transformation of mineral composition, pore evolution and adsorption of liquid hydrocarbon have certain influence on the mechanism of shale gas occurrence, and the lithologic assemblage characteristics of "generation-reserve-caprock" layer are the important restricting factors of shale gas preservation conditions. The storage and preservation conditions of shale gas in Jiangxi Province are good as a whole, but the preservation conditions of shale gas in Pingle depression are relatively poor. Finally, the enrichment model and law of shale gas in Jiangxi Province are summarized. It is found that the enrichment model of shale gas in Jiangxi Province is mainly divided into high organic matter abundance enrichment model of coastal facies evolution and high organic matter abundance enrichment model of deep-sea basin facies evolution. The enrichment model of low organic matter abundance in shallow-sea shelf facies, the hydrocarbon generation potential of shale gas in the first two types of shale gas enrichment model is better, the sedimentary environment is closed and stable, the evolution degree is high, High organic matter abundance and good pore development are favorable for shale gas enrichment.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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