乌兰废弃煤矿瓦斯赋存地质特征及开发技术

Geological characteristics of gas occurance and technical countermeasures of Wulan abandoned coal mine

为了促进乌兰废弃煤矿瓦斯资源开发和综合利用,依据该废弃煤矿地质和两口瓦斯排采煤层气参数井资料,分析其瓦斯赋存地质特征、资源条件、富集模式和开发优势,探讨乌兰废弃煤矿瓦斯开发技术,结果表明:乌兰废弃煤矿瓦斯地质构造相对简单,煤层层数较多,可采煤层厚度较大,煤层气含气量较高且渗透性较好,储层压力梯度较大,瓦斯资源量较丰富;断层中存在泥岩涂抹现象,地下水动力封堵及盖层配置良好,该研究区瓦斯富集特征可识别为盖层-断层-水动力封堵型瓦斯富集模式,并以此预测瓦斯资源甜点区。在对瓦斯赋存地质特征、资源条件、富集模式和开发优势研究的基础上,提出了乌兰废弃煤矿瓦斯开发利用相应的技术和对策。

In order to promote the development of gas resources in Wulan abandoned coal mine,the gas occurrence pattern,resource distribution,enrichment mode and development advantages of the study area were analyzed.Based on the analysis of resource potential and existing mature technologies,the technical countermeasures of gas development were discussed.The results showed that the area had the characteristics of“simple structure,many coal seams,large coal thickness,high gas content and good permeability,large pressure gradient of reservoir and large gas resources”.Under the conditions of fault mudstone daubing,hydrodynamic plugging and good caprock configuration,the gas enrichment mode was caprock-fault-hydrodynamic plugging type,and the sweetzone of the gas occurance was predicted based on this.Based on the above research and understanding,the technical countermeasures for gas development were put forward.