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我国的煤层气资源量约为35×1012m3。近年来,已在20多个含煤区进行了煤层气勘探,4层气探井数已达70口,其中煤层气日产逾千立方米的井仅有6口。目前的勘探特点为:①产量低,递减快;③煤层渗透率低,压力低;③煤阶低;④煤层埋藏浅,处于甲烷风化带;⑤煤层薄,顶底板砂岩含水层发育;③有的煤层埋藏太深。拟合于固体勘探和流体勘探之间的煤层气勘探,其最大特点是气源岩与储气层同层,勘探开发的重点是煤层中的吸附气,研究的重点是搞清控制煤层中甲烷的分布、储存能力和气井产能的地质及水文因素。必须突破旧有思路的束缚,从煤层气勘探的选区评价、布井、钻井、完井和增产措施到开采方式、集输和环境保护等方面建立起一整套行之有效的工作程序和勘探方法。勘探重点地区应为华北地区的京津唐含煤区以及山西、陕西和河南的部分含煤区等;其次是华南地区的有利含煤区。
China’s CBM resources are about 35 × 1012m3. In recent years, coalbed methane exploration has been carried out in more than 20 coal-bearing areas. The number of gas exploration wells on the 4th floor has reached 70, of which only 6 are over a thousand cubic meters of CBM per day. The current exploration features are as follows: ① low output and rapid decline; ③ low permeability and low pressure; ③ low coal rank; ④ shallow coal seam buried in methane weathering zone; ④ thin coal seam, top and bottom sandstone aquifer development; The coal seam is buried too deep. The most prominent feature of CBM exploration that fits between solid exploration and fluid exploration is the same source rock and gas reservoir. The focus of exploration and development is the adsorption gas in the coal seam. The emphasis of the study is to find out whether controlling methane Geological and hydrological factors of distribution, storage capacity and gas well productivity. We must break through the shackles of the old ideas and establish a set of effective working procedures and exploration methods from the CBM exploration constituency evaluation, drilling, drilling, completion and stimulation measures to the mining methods, gathering and transportation and environmental protection . Key areas for exploration should be the coal-bearing areas of Beijing, Tianjin and Tangshan in northern China, and some coal-bearing areas in Shanxi, Shaanxi and Henan, followed by favorable coal-bearing areas in southern China.