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鄂尔多斯盆地乌审煤田是我国煤层气勘探的重要区块。为搞清该区煤层气藏富集规律,通过气测录井和现场解吸等手段研究了该区煤层气地质特征;通过分析不同煤层气井的含气量、煤层顶底板岩性等资料,认为影响勘查区煤层气富集的关键因素是上覆有效盖层的厚度;通过煤层气样的气体组分分析,确定了甲烷风化带的大致影响范围。预测结果显示,乌审煤田煤层气主要赋存于中、北部3-1煤层800 m以深地区,顶底板封盖良好区域含气量可达到8 m3/t,具有良好的勘探开发前景。
The Wushen coalfield in the Ordos Basin is an important block of CBM exploration in China. In order to find out the law of enrichment of coalbed gas reservoirs in this area, the geological characteristics of coalbed methane in this area have been studied by means of gas logging and field desorption. By analyzing the gas content of different coalbed methane wells and the lithology of top and bottom of coal seam, The key factor of CBM enrichment in the exploration area is the thickness of the overlying caprock. Through the gas composition analysis of coal bed gas samples, the general influence range of methane weathering zone is determined. The prediction results show that the CBM in Wushen coalfield mainly occurs in the depth of 800 m deep in the middle and northern part of 3-1 coal seam, and the gas content in the good area of top and bottom capping can reach 8 m3 / t, which has good exploration and development prospects.