青海省木里煤田煤系页岩气生烃条件分析

结合大地构造背景和沉积相分析，基于钻孔资料进行暗色泥页岩及粉砂岩等的厚度统计，研究了青海省木里煤田聚乎更矿区泥页岩的空间展布特征。并通过木里煤田煤（岩）样热解实验、镜质体反射率实验，从有机质丰度、类型、成熟度等一系列地化特征方面，分析木里煤田生成页岩气的烃源岩的生烃能力。结果表明：木里煤田含煤岩系纯泥岩厚度百分比大于10％，细碎屑岩在地层中的百分比为31．98％～53．69％；该区泥页岩的有机质丰度为0．520％～86．060％，有机质成熟度0．740％～1．851％，有机质类型主要为Ⅱ2-Ⅲ型干酪根。该研究对评价页岩气资源和促进木里煤田资源综合开发具有重要意义。

Analysis of hydrocarbon generation conditions of shale gas in coal series in Muri coalfield,Qinghai province

This paper draws on the study of tectonic background and sedimentary facies, offers statis- tics associated with the thickness of dark mud shale and siltston according to the existing drilling date, and investigates the spatial distribution characteristics of the shale in Muri coalfield Juhugeng of Qinghai prov- ince. This investigation involves everything from coal （rock） pyrolysis experiments to coal （rock） vitrinite reflectance experiments and analyzing the ability of source rock to generate shale gas, based on the organic matter abundance, organic matter type, organic matter maturity and a series of geochemical characteristics. The results show that, in Muff coalfield, there occur coal-bearing rock series with the percentage of pure mudstone thickness of more than 10% and with fine clastic rock varying from 31.98% to 53.69% in forma- tion ; mud shales in this area are found to have organic matter abundance of 0.520% - 86.060%, organic matter maturity ranging from 0.740% to 1. 851%, and organic matter type dominated by Ⅱ2-Ⅲ kerogen. The research serves as important significance for the understanding of shale gas resource and promoting the comprehensive exploitation of coal resources occurring in Muff coalfield.