低煤阶煤层气勘探思路

世界范围内低阶煤层气勘探开发已获得了巨大的成功，中国拥有丰富的低煤阶煤层气资源，具有广阔的勘探前景。从分析美国粉河、尤因塔盆地的勘探开发基础资料入手，得出这2个盆地低煤阶煤层气有多种气源存在、储层物性好、早期勘探立足于成藏背景优越地区的局部构造可取得较好成效的认识；进而在分析低煤阶煤层气成因的基础上，指出我国东北、西北含煤盆地和煤、油共生的湖盆具备形成多源气的地质条件，是寻找低煤阶煤层气的有利地区，其中准噶尔盆地是近期勘探的现实地区。同时也指出，在勘探思路上，必须坚持将煤层气勘探与常规气勘探进行有机结合，即走综合立体勘探的道路，才能取得理想的勘探效果。

Exploration Direction of Coalbed Methane in Low-rank Coats

Exploration and development of CBM from low rank coals have been very successful in the world, and its exploration potential in China is very large because China is very rich in such resource. The basic exploration and development data of CBM in the Powder River Basin and the Uinta Basin in the U. S. A. are first analyzed. It is found that the low rank coals have multiple gas sources and favorable poroperm characteristics, and that exploration in the initial stage should be focused on local structures in areas with favorable pooling conditions. Based on an analysis of CBM origin in low rank coals, it is believed that the geologic conditions for the formation of multi source CBM reservoirs exist in coal bearing basin and lake basins with both coal and oil generated in northeast and northwest of China, thus they are favorable areas for exploration of CBM in low rank coals. Among them the Junggar Basin is a realistic area for a breakthrough in CBM exploration in near future. Moreover, it also pointed out that exploration of CBM should be integrated with conventional oil/gas exploration, so as to obtain ideal exploration effects.