沁水盆地煤系地层页岩储层评价及其影响因素

发布时间：2018-05-27 15:01

本文选题：沁水盆地 + 页岩气　；参考：《煤炭学报》2017年S1期

【摘要】：以沁水盆地中部及南部的煤系地层的泥页岩取芯为研究对象,重点剖析了石炭系太原组及二叠系山西组两套主力产气层位,分别从烃源岩、岩石学性质、储层物性及其影响因素等方面进行分析。研究表明,沁水盆地泥页岩样品生烃潜力较好,样品总有机碳含量在厚层泥岩发育段具有较高值,有机质成熟度指标Ro在1.33%~2.17%,已达到生气窗,有机质显微组分以腐泥组为主,有机质类型均为I型干酪根;全岩分析表明,泥页岩样品脆性矿物含量较高,多数在40%以上;黏土矿物主要以伊/蒙混层矿物及高岭石为主,绿泥石及伊利石含量次之;经扫描电镜观察,泥页岩中矿物溶孔、粒间孔及微裂隙较为发育;孔隙度分布于0.7%~3.8%,略低于北美页岩,渗透率在0.002 8×10-15~0.127 3×10-15m2,与北美页岩无太大差异;黏土矿物中高岭石及伊利石对储层物性影响较大,其中前者对孔渗发育具有建设作用,而后者含量越多对储层物性影响越不利。各项有机地球化学参数表明沁水盆地泥页岩具有较高的生烃潜力,储层孔隙度及渗透率适中,较高的脆性矿物含量有利于页岩气的后期储层压裂改造。
[Abstract]:Taking the shale core of coal-measure strata in the central and southern Qinshui Basin as the research object, two sets of main gas-producing strata of Taiyuan formation of Carboniferous and Shanxi formation of Permian are analyzed, respectively from the source rocks and petrological properties. Reservoir physical property and its influencing factors were analyzed. The results show that the hydrocarbon generation potential of the shale samples in Qinshui Basin is good, the total organic carbon content of the samples has a higher value in the thick mudstone development section, the organic matter maturity index Ro is 1.33 and 2.17, which has reached the gas generating window, and the macerals of organic matter are mainly saprotic mud formation. The organic matter types are all type I kerogen, the whole rock analysis shows that the content of brittle minerals in shale samples is higher, most of them are above 40%, and the clay minerals are mainly composed of eosinite / montmorillonite and kaolinite, followed by chlorite and Illite. The mineral dissolved pores, intergranular pores and microfractures in shale were observed by scanning electron microscope, and the porosity distributed at 0.78%, slightly lower than that of North American shale, with a permeability of 0.002 脳 10 ~ (-15) ~ 0.127 ~ 3 脳 10 ~ (-15) m ~ (2), no significant difference from that of North American shale. Kaolinite and Illite in clay minerals have great influence on reservoir physical properties, among which the former has constructive effect on the development of pore and permeability, while the latter has more adverse effects on reservoir physical properties. The organic geochemical parameters show that the shale in Qinshui Basin has high hydrocarbon generation potential, moderate porosity and permeability, and high brittle mineral content is beneficial to the later fracturing of shale gas.
【作者单位】：中国地质大学(北京)能源学院;中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室;中国地质大学(北京)非常规天然气地质评价及开发工程北京市重点实验室;中原油田分公司物探研究院;中联煤层气有限责任公司研究中心;
【基金】：国家科技重大专项基金资助项目(2011ZX05042-001-002)
【分类号】：P618.13

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