大宁地区煤层气成藏控气因素分析

大宁地区是鄂尔多斯盆地东部石炭-二叠含煤层系的主要分布区，煤层气资源量约为1.8×10¹²m³。通过研究该区上石炭统太原组和下二叠统山西组主力煤层厚度、埋深、煤岩煤质特征及演化程度、煤层吸附性、煤储层物性及含气性、煤层气保存条件和资源分布等因素，得出了以下结论：大宁地区煤层气成藏控气条件有利，具有煤层厚度大、分布面积广、煤储层孔裂隙发育、含气量高，煤层吸附饱和度高、顶底板封盖性能好、水动力条件优越等特点，是中煤阶煤层气勘探的有利目标区。

AN ANALYSIS OF CONTROL FACTORS ON CBM POOLING IN DANING AREA, ORDOS BASIN

The Permo Carboniferous coal bearing series of strata in the eastern Ordos Basin are mainly distributed in Daning area and the resource volume of CBM in this area is about 1.8 TCM. The major coal seams in the Upper Carboniferous Taiyuan Formation and the Lower Permian Shanxi Formation are studied in respects of coal seam thickness, burial depth, coal quality and coal rank, adsorption of coal seams, poroperm characteristics and gas bearing properties of coal reservoirs, preservation conditions and distribution of CBM resources. It is believed that Daning area is characterized by large thickness of coal seam, extensive distribution area, well developed pores and fractures and high gas content in coal reservoirs, high adsorption saturation, good sealing ability of the top and bottom seals, and favorable hydrodynamic conditions, thus is a favorable exploration target for CBM in medium rank coals.