开平煤田煤层气富集成藏及其控制因素

基于开平煤田构造演化背景和煤层气勘探研究结果,研究了煤层气从生成、储集、运移到聚集的演化过程。结果表明：在开平煤田的不同构造部位,由于煤系埋藏条件和后期构造运动改造影响,煤层气富集成藏模式不同,主要分为3个类型：唐山矿W字型、吕家坨矿阶梯型与东欢坨矿V字型。受不同成藏模式的控制,煤层气含量、压力分布明显不同,大致呈“西高东低冶的趋势。开平向斜的南东翼瓦斯压力普遍较低,全为低瓦斯矿井;北西翼瓦斯压力普遍较高,分布有2个高突矿井和1个高瓦斯矿井。

Enrichment Deposit and Control Factors of Coal Bed Methane in Kaiping Coalfield

Based on the structure evolution background of the Kaiping Coalfield and the study results of the CBM exploration,the paper had a coal bed a study on methane evolution process from a generation,storage,migration to accumulation.The study results showed that at different structure location of the Kaiping Coalfield,due to the coal measures deposit conditions and the influence of the later structure movement reconstruction,the enrichment deposit mode of the coal bed method would be different and there were three type modes mainly.They were W type in Tangshan Mine,ladder type in Lujiatuo Mine and V type in Donghuantuo Mine.Due to the control by the different deposit modes,the CBM content and pressure distribution would be obviously different and the tendency would be west high and east low generally.The gas pressure in the south-east wing of Kaiping syncline was low generally and the mines there would be low gassy mine in all.The gas pressure in the north-west wing would be high generally and there were two high outburst mines and one high gassy mine.