海拉尔盆地煤层气成藏机理及勘探方向

海拉尔盆地是中生代白垩系含煤盆地，煤层气总资源量约2×10¹²m³。为确定该盆地煤层气勘探潜力，通过研究该区煤层厚度、埋深、煤岩煤质特征及演化程度、煤储层物性及含气性、煤层气保存条件和资源分布等因素，弄清了该盆地煤层气的分布特征。结果认为，海拉尔盆地具有很好的煤层气富集成藏条件，其中尤以盆地东部呼和湖凹陷的煤层气成藏地质条件为最好。该凹陷具有煤层厚度大、分布面积广、储层孔隙发育、顶底板封盖性能好的特点，煤层气资源量达1.25×10¹²m³，占全盆地煤层气总资源量的62％，是今后首选的煤层气勘探目标。

RESERVOIRING MECHANISM OF COALBED METHANE AND EXPLORATION DIRECTION IN HAILAER BASIN

The Hailaer Basin is a Mesozoic Cretaceous coal bearing basin with total resources of coalbed methane about 2 TCM. In order to determine the potentials of coalbed methane exploration in this basin, the distribution of coalbed methane is revealed through studying the thickness and burial depth of coal seams, coal quality and coal rank, poroperm characteristics and gas bearing properties of coal reservoirs, preservation conditions and distribution of coalbed methane resources in the study area. It is believed that the Hailaer Basin, especially Huhehu sag in the eastern part of the basin, has very favorable geological conditions for accumulating coalbed methane. Huhehu sag is characterized by large thickness of coal seams, large distribution, well developed pores of the reservoirs and good sealing capacity of the top and bottom seals and contains coalbed methane resources up to 1.25 TCM, accounting for 62% of the total in the whole basin, thus it is the most favorable exploration target for exploring coalbed methane in the future.