国内外煤层气地质对比及其启示

doi:10.11743/ogg20140515

摘要/Abstract

摘要： 美国、澳大利亚和中国的含煤盆地均很多，但煤层气地质条件差异很大。其中多数盆地地质条件较差，仅少数盆地煤层气资源富集，储层特征和构造、水文条件优越，勘探开发效果好。在圣胡安、沁水等勘探效果良好的盆地内，不同区带（地区）也存在巨大差异。根据煤层气地质条件、富集成藏模式以及开发技术条件，可分为中-高煤阶和低煤阶类型。利用建立的煤层气分类对比方法体系，对美国中-低煤阶型圣胡安盆地、低煤阶型粉河盆地、澳大利亚复合煤阶型鲍温-苏拉特盆地、中国高煤阶型沁水盆地、复合煤阶型鄂尔多斯盆地以及这些盆地中主要区带（地区）进行了对比分析，发现我国的鄂尔多斯、沁水盆地等最具潜力的盆地与圣胡安、鲍温-苏拉特盆地差异较大。樊庄、韩城、延川南、织金等区块仅与圣胡安区3带等相似。因此，我国煤层气地质条件和可采性相对较差，近、中期可有效勘探开发的目标不多。从战略层面看，不宜把中、长期发展目标定得太高；从战术层面看，要重视差异性分析，预测资源甜点，优选目标，并针对性部署勘探开发工作，更要注意控制速度。

关键词: 地质条件, 煤层气, 含煤盆地, 国内外

Abstract: America,Australia and China all have many coal bearing basins with greatly different geological conditions of coalbed methane.Among these basins,most are poor in geological conditions of coalbed methane,excerpt for a few which have rich coalbed methane resources,excellent reservoir characteristics,structural and hydrological conditions,thus are successful in exploration and development.Even in well developed basins，such as San Juan Basin and Qinshui Basin,the geology conditions are also greatly different in different regions.According to CBM geological conditions,accumulation models and development conditions,these basins can be divided into mid-high-rank coal basins and low-rank coal basins.A CBM classification and correlation method system was established to perform comparative analysis among the mid-rank coal in San Juan Basin and low-rank coal in Powder River Basin of America,complex rank coal in Bowen/Surat Basin of Australia,high rank coal in Qinshui Basin and complex rank coal in Ordos Basin of China,as well as the main zones(areas)in these basins.It was found that the most prospective Ordos Basin and Qinshui Basin in China are greatly different with San Juan Basin,Bowen/Surat Basin.Fanzhuang,Hancheng,south Yanchuan,Zhijin and other blocks are only similar to the Zone-3 in San Juan Basin’s.It is therefore concluded that the coalbed methane geological conditions and recoverability are relatively poor in the coal basins in China,and effective exploration and development targets are different to find in the near and medium terms.So from a strategic perspective,the long-term development goals should not be set too high.And from a tactical perspective,attentions should be paid to analyzing difference,forecasting resources sweet spot,picking the favorable target,arranging targeted deployment on exploration and development,and controlling development speed.

Key words: geological condition, coalbed methane, coal bearing basin, home and broad

中图分类号:

TE132.2

龙胜祥,李辛子,叶丽琴,等. 国内外煤层气地质对比及其启示[J]. 石油与天然气地质, 2014, 35(5): 696-703. doi: 10.11743/ogg20140515 Long Shengxiang,Li Xinzi,Ye Liqin,et al. Comparison and enlightenment of coalbed methane geology at home and abroad[J]. Oil & Gas Geology, 2014, 35(5): 696-703. doi: 10.11743/ogg20140515

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