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临兴地区处于开发初期,上古生界煤系烃源岩特征及排烃规律不清,制约了下一步的勘探开发。综合运用测井及分析化验资料,对该区煤系烃源岩的分布、地球化学特征、排烃规律及控藏作用进行了深入研究。结果认为:临兴地区烃源岩为太原组—山西组煤岩、暗色泥岩及炭质泥岩,有机质丰度为中等—好,受沉积环境影响,有机质类型以Ⅲ型为主,含部分Ⅱ1型和Ⅱ2型,Ⅱ1型仅发育于太原组,且从太原组到山西组,Ⅲ型所占比例增大,Ⅱ型所占比例减小;受紫金山碱性杂岩体影响,有机质为高成熟—过成熟,生气强度大于20×108m3/km2,呈西高东低、北高南低、大面积广覆式生烃特点;排烃强度控制气藏范围,太原组排烃效率及总排烃量优于山西组,对上古生界气藏形成贡献较大。该研究深化了临兴地区上古生界煤系烃源岩的系统认识,为该区煤系致密砂岩气运聚成藏特征及勘探开发提供了重要的参考依据。
The Linxing area is in the early stage of development. The characteristics of the Upper Paleozoic coal measures of source rocks and the hydrocarbon expulsion laws are unclear, restricting the next exploration and development. Based on comprehensively using well logging and analytical laboratory data, the distribution, geochemical characteristics, hydrocarbon expulsion laws and reservoir-controlling functions of coal-bearing source rocks in this area have been studied in depth. The results show that the source rocks in the Linxing area are Taiyuan-Shanxi coal, dark mudstone and carbonaceous mudstone. The abundance of organic matter is medium-good. Affected by sedimentary environment, the type of organic matter is mainly type Ⅲ, And type II2, type II1 only developed in Taiyuan group, and from Taiyuan group to Shanxi group, the proportion of type Ⅲ increased, the proportion of type Ⅱ decreased; affected by the Purple Mountain alkaline complex body, the organic matter is highly mature - Over mature, with an intensity of over 20 × 108m3 / km2, showing the features of low-west high and low north-north, and large-area broad-cover hydrocarbon generation characteristics; hydrocarbon expulsion intensity control reservoir range, hydrocarbon expulsion efficiency and total hydrocarbon expulsion in Taiyuan Formation It is superior to Shanxi Formation and contributed greatly to the formation of Upper Paleozoic gas reservoirs. The study deepens the systematic understanding of the Upper Paleozoic coal measures of source rocks in the Upper Paleozoic and provides an important reference for the gas accumulation, accumulation and accumulation of tight sandstone in the coal measures in the area.