川南煤田古叙矿区煤层气勘探选层的探讨

A Discussion on CBM Exploration Target in Guxu Mining Area, South Sichuan Coalfield

川南煤田煤炭资源占四川省煤炭资源的60%以上,评价的煤层气资源量占80%以上。通过煤炭资源勘查、煤层气参数井资料分析,认为将龙潭组全段作为一个目的层段研究,将有助于全方位客观评价四川省煤层气的勘探开发前景。根据煤层间距小、储层参数差异小、含气量高等条件提出了以C12-C14、C15-C21、C23-C24、C25煤层群(组)作为目的煤层的观点,并提出必须加大施工排量、多打铺垫液、提高加砂浓度的压裂改造等建议,以期对南方小盆地多煤层的煤层气开发提供新的思路。

Coal resources in the South Sichuan coalfield account for 60% more in the Sichuan Province, estimated CBM resources 80% more. Through coal resource exploration and CBM parameter well data analysis, considered that to take whole Longtan Formation as a target will help to omnidirectionally and objectively evaluate CBM exploration and exploitation prospect in the province. Based on conditions of small interval between coal seams, small difference of reservoir parameters and high gas content, put forward a new idea to take the C12-C14, C15-C21, C23-C24 and C25 coal seam group （set） as coal seams of interest. The paper advised that have to increase emissions, bedding liquid and adding sand concentration fracturing proposals to provide new idea on CBM exploitation in small basins, multiple coal seams in South China.