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首页> 外文期刊>Australian Journal of Earth Sciences >Accumulation models for coalbed methane in medium- to high-rank coals: examples from the southern Qinshui Basin and southeastern Ordos Basin
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Accumulation models for coalbed methane in medium- to high-rank coals: examples from the southern Qinshui Basin and southeastern Ordos Basin

机译：煤层煤中煤层煤的累积模型：秦水盆地南部和东南鄂尔多斯盆地的实例

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摘要

The majority of known coalbed methane (CBM) production worldwide comes primarily from high-abundance CBM-enrichment areas or fairways.' The high-abundance CBM-enrichment areas are primarily characterised by large CBM resources with high single-well productions. CBM accumulation areas from the medium- to high-rank coals in the southern Qinshui Basin and the Hancheng CBM fields in the Ordos Basin were investigated based on regional geological analyses and physical analogue experiments. The results show that gas contents in the study areas increase with depths over the range from approximately 300 to 800m, while permeabilities generally decrease with depths. Intervals with optimal gas content and permeability exist at a moderate depth along an inclined coal seam under the coupled control of temperature and stress. Brittle-ductile transition deformation increases the permeability and the pore-specific surface areas of coals. The gas content and permeability of the CBM reservoirs are shown to be two key factors determining the formation of high-abundance CBM areas. The coupling of gas enrichment and high permeability provides a favourable combination for CBM accumulation and high production. Combining CBM exploration and development practices in the study areas with physical analogue experiments, two CBM-enrichment models for medium- to high-rank coal have been recognised for different geological conditions, including (1) the model controlled by the depth in the slope zone and (2) the model controlled by the coal brittle and ductile in the deformation zones.
机译：全球大多数已知的煤层甲烷（CBM）生产主要来自高度丰富的CBM浓缩区或球道。高丰度CBM富集区域主要是具有高单井生产的大型CBM资源。基于区域地质分析和物理模拟实验，研究了秦山盆地南部南部高级煤的煤层累积区和鄂尔多斯盆地中的汉城CBM领域。结果表明，研究领域的气体内容在约300至800米的范围内增加，而渗透率通常随深度降低。在耦合控制温度和应力的控制下，沿着倾斜煤层的中等深度存在具有最佳气体含量和渗透性的间隔。脆性转变变形增加了煤的渗透率和孔隙特异性表面积。 CBM储存器的气体含量和渗透率被证明是确定高丰度CBM区域的形成的两个关键因素。气体富集和高渗透率的偶联为CBM积累和高生产提供了有利的组合。将CBM勘探和开发实践与物理模拟实验的研究区相结合，为不同的地质条件识别出用于中至高级煤的两种CBM富集模型，包括（1）由斜坡区中深度控制的模型（2）由煤脆性和韧性控制的模型在变形区中。

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