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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5000m^3/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。

A Discussion on the Geological Conditions of Forming Wangyingzi Coal-bed Methane Reservoir in Fuxin Coal Field

Wangyingzi coal-bed methane reservoir is located in Wangyingzi coal mine of Fuxin coal field in the west part of Liaoning Province.A natural gas outrush occurred when the tunneling was being made at north flank for constructing the coal mine.The tunnel had to be plugged because of its high gas outrush rate.Up to now the natural gas with an average rate of more than 5 000 m 3/d has been developed and utilized for over ten years.In order to survey the genetic type and resource potential of the natural gas reservoir,a synthetic study on the characteristics of geochemistry and gas outrush and the geological conditions of occurrence was carried out by the authors.Through such a study it is thought that the natural gas in the reservoir mainly came from the coal measure strata of the Fuxin Formation.The shape of the gas production rate curve over the years is similar to that of the production curve of coal-bed methane well,however,there is some difference between them,which results mainly from the coal-bed methane desorbed and accumulated in the fractures because of the water drainage and depressurization in the early stage of constructing the coal mine.Wangyingzi area has fair prospects for coal-bed methane because the coal measure strata at this area are of the geological conditions as large thickness,abundant resources and high permeability.