鄂尔多斯盆地神府地区含煤层气系统特征

为指导神府地区上古生界煤系天然气共探合采,综合应用岩心、测井及生产动态等资料,对煤层气及煤系砂岩气成藏地质条件展开系统研究,划分含煤层气系统并分析其成藏模式。结果表明:神府地区稳定的构造背景和优越的沉积环境为煤系天然气成藏奠定了良好的源-储-盖条件。受区域性低渗透泥质岩层阻隔,区内上古生界煤系地层可划分为8+9~#煤-本1段、太2段砂岩下含煤层气系统和4+5~#煤-太1段、山2段砂岩上含煤层气系统2套叠置含煤层气系统,西部深陷带中南部是含煤层气系统内煤层气与煤系砂岩气的合采有利区。

Characteristics of CBM-bearing system in Shenfu Area, Ordos Basin

In order to guide the commingled exploration and exploitation of coal measure natural gas in Upper Paleozoic in Shenfu area, the data of coring, logging and performance of wells were used to analyze the accumulation conditions and accumulation model of Coalbed methane (CBM) and coal measure sandstone gas. The CBM-bearing systems were divided and their accumulation model was discussed. The results show that stable structural evolution and superior sedimentary environment provide coal measure natural gas with the nicer gas sources, reservoirs and cap rocks. Separated by regional impermeable gas barrier mudstone , the upper Paleozoic coal-bearing strata in the study area can be divided into 2 sets of vertically superimposed CBM-bearing systems: lower CBM-bearing system consists of No. 8+9 seams, Ben1 member and Tai2 member sandbodies, upper CBM-bearing system consists of No. 4+5 seams, Tai1 member and Shan2 member sandbodies, the middle and south part of western depression zone could be a favorable zone for Commingled exploitation of CBM and coal-measure sandstone gas in CBM-bearing systems.