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王营子煤层气藏位于辽宁省西部阜新市王营子煤矿。该矿在建矿掘进北翼大巷时发生天然气涌出 ,因涌出量大而封闭并开发利用 ,产气量平均达 5 0 0 0m3/d以上 ,至今已十多年。为了探明天然气藏的成因类型及资源前景 ,作者对气藏气体的地球化学特征、产出特征及赋存地质条件进行了综合研究。通过研究认为 ,气藏气体主要来自阜新组煤层。从历年来气产量变化曲线形态分析 ,具有煤层气井生产曲线特征 ,但是也有区别。原因主要是受建矿早期的排水、降压作用 ,煤层气解吸并富集在裂隙中的结果。从王营子煤层气赋存地质条件分析 ,煤层厚度大 ,资源丰度及渗透率高等 ,反映该区煤层气有较好的勘探前景。
Wangyingzi CBM reservoir is located in Wangyingzi Coal Mine, Fuxin City, western Liaoning Province. The mine gushed out of natural gas during excavation of the northern wing of the mine. Due to its large emission volume, the mine closed up and was exploited. The average gas production reached over 500m3 / d and it has been more than 10 years. In order to find out the genetic types and resource prospects of natural gas reservoirs, the author conducted a comprehensive study on the geochemical characteristics, output characteristics and geological conditions of gas reservoirs. According to the research, the gas in the gas reservoir is mainly from the coal seam of Fuxin Formation. From the analysis of gas production curve over the years, it has the characteristics of CBM production curve, but there are also differences. The main reason is the result of drainage and pressure-relief in the early stage of construction and the desorption of CBM and enrichment in fractures. Based on the analysis of geological conditions of Wangyingzi CBM reservoir, the thickness of coal seam is high, the abundance of resources and permeability are higher, which shows the prospect of coalbed methane exploration in this area.