基于含水层流线模拟预测煤层气富集高产区

摘要

为了直观反映沁水盆地南部地下水动力场特征，从而有效划分煤层气开采有利区，基于区域水文地质条件的分析，利用QuantyView及IES模拟软件对上石炭统太原组15号煤层段含水层进行流线模拟。结果表明：整体趋势是地下水自东北向西南单向网状径流，局部汇流；分别在枣园和潘庄地带形成汇水中心，但不同地段的水动力条件却有所差异，这是造成煤层气井产气（水）量非均质性较强的重要原因。结合分析了地下水动力场与煤层含气量之间的关系，认为地下水的补给区、径流区、滞留区分别对应煤层低含气带（<8 m3/t）、中等含气带（8~16 m3/t）、高含气带（>16 m3/t）。据此预测得出研究区由边缘向中心依次为煤层气勘探不利区、较有利区和最有利区。%In order to directly show the hydrodynamic field in the southern Qinshui basin,and selecte the favorable zone for coalbed meth-ane exploration,based on the hydrogeology investigation,the No.15 Coal Seam Aquifer had been streamline simulated with QuantyView and IES Softwares.The results indicated that the reticular unidirectional groundwater run off in aquifer from the Northeast to the Southwest on the whole.Sometimes it converged locally,finally,forming the Zaoyuan and the Panzhuang Catchment Area respectively.But the hydrody-namic conditions varied with different areas,causing the different productivity of coalbed methane and water in study areas.The paper com-bined with analysis of the relationship between hydrodynamics and gas content,and suggest that the recharge,run off and stagnation areas of groundwater are corresponding to the low gas content zones(<8 m3/t),medium(8~16 m3/t)and high(>16 m3/t)respectively.At last, the research area have been divided into the unfavorable,more and the most favorable area from the boundary to the centre respectively.