云南恩洪-老厂煤层气勘查区地质特征及勘探开发策略

CBM geological characteristics and exploration and development strategy of Enhong-Laochang exploration blocks,Yunnan province

综合地质分析表明,云南恩洪-老厂煤层气勘查区具有煤系发育、埋深适中、中厚煤层、中高阶煤、含气量高、构造复杂、资源潜力大等特点,是我国西南地区最有希望实现煤层气勘探开发商业化的地区之一。根据该勘查区煤系特征与地形特点,提出了具体的勘探开发策略建议:对煤层气、致密砂岩气和页岩气应"三气共探";应采用丛式井组、压裂改造和水平井等钻完井技术,试用N2压裂和CO2注入等增产措施;煤层气企业应与煤矿合作,在高瓦斯矿区推广利用煤层气地面抽采技术,在降低煤矿安全风险的同时加快煤层气商业化开发进程。

Comprehensive geological analysis indicates that the coalbed methane reservoirs of Enhong- Laochang exploration blocks in Yunnan province have such characteristics as rich coal-bearing strata, suit- able burial depth, middle thickness, middle-high rank, high gas content, complex geological structure, high potential of resource, which is one of the most hopeful region of commercial exploration and develop- ment in the southwest of China. Based on the characteristics of coal-bearing strata and topography, the strategy of exploration and development is proposed. Tight gas, shale gas and CBM should be explored in the same exploration well; the cluster horizontal well groups stimulated by fracturing are suitable methods in which nitrogen foam fracturing and carbon dioxide injection should be tentatively applied; corporation with coal mines should be established and CBM drainage on surface in high gas area should be applied, which can reduce the mine risk and promote the commercial development of CBM.