古蔺叙永地区煤层气勘探开发前景分析

Analysis on Exploration and Development Prospects of Coalbed Methane in the Area of Xuyong and Gulin County

在加大油气资源勘探开发力度,提升国内油气资源保障程度,加快四川省清洁能源示范省的建设进程中,古蔺叙永地区煤层气资源的勘探开发,对加快四川省煤层气资源开发利用步伐意义重大。在总结2002年以来古蔺叙永地区煤层气资源勘探研究、煤层气参数井施工、地面抽采井试气工程的成果基础上,阐明由层滑构造控制形成的构造煤是制约该地区煤层气商业化开发的主因,从煤储层解吸效率等参数角度剖析提高煤层气井产量的原理和方法,认为临储压差、临废压差、有效解吸量和解吸效率四者共同控制着煤层气井产气潜力。研究区煤层气资源富集,具有较好的开发前景。建议加快规模化开发,开展适合构造煤储层改造方式的研究,加强深部煤层气勘探,扩大煤层气工作有利区,实现四川省煤层气资源综合勘查开发利用的目标。

In order to realize the development and utilization of coalbed methane (CBM) resources in Sichuan Province, especially in the area of Gulin and Xuyong, it is of great significance to intensify the exploration and development of oil and gas resources, improve the guarantee level of domestic oil and gas resources, and accelerate the construction process of a clean energy demonstration province in Sichuan Province.On the basis of summarizing the achievements of CBM resource exploration research, CBM parameter well construction and surface extraction well gas test project in the area of Gulin and Xuyong since2002, it is clarified that the structural coal controlled by the slip structure is the main factor restricting the commercial development of CBM in this area.The principle and method of improving CBM well yield are analyzed from the perspective of parameters such as desorption efficiency of coal reservoir, etc.It is believed that the temporary storage pressure difference, temporary waste pressure difference, effective desorption amount and desorption efficiency jointly control the gas production potential of CBM wells.The coal seam (system) gas resources in the study area are enriched and have good development prospects.It is suggested to speed up large-scale development, carry out research on suitable structural coal reservoir reconstruction methods, strengthen deep coalbed methane (DCBM) exploration, expand favorable areas for coalbed (system) gas work, and realize the goal of comprehensive exploration, development and utilization of coalbed methane resources in Sichuan Province.