Abstract The Miocene Soma Coal Basin may be one of the most promising areas for low-rank coalbed methane in Turkey. So far, the coalbed methane potential of the coal seams in the Kinik Coalfield, Soma Basin has not been adequately studied. A systematic investigation was performed on the gas content distribution of the kP1 and kM2 coal seams and its geological controls, which has been based on the geological data and the experimental results of 84 coal samples taken from 37 coal exploration wells in the Kinik coalfield, Soma Basin. Samples were analyzed in terms of coal properties and gas content. The gas content was measured by the direct method based on the canister desorption test. The gas content of the kP1 and kM2 coal seams range from 0.90 to 2.61 m3/t and 0.51 to 3.86 m3/t respectively, on as-received basis, with increasing trend from west to east areas in both seams. Diffusivity values of the kP1 and kM2 coal seams vary from 2.84 × 10−5 min−1 to 56.4 × 10−5 min−1, and from 0.64 × 10−5 min−1 to 54.3 × 10−5 min−1, respectively. The gas content of the kP1 seam has not been correlated with the coal properties, whereas the gas content of the kM2 seam has positive correlation with fixed carbon content and gross calorific value, and negative correlation with moisture and ash content. Normal faults are well developed in the study area play an important role at gas migration, causing gas dissipation and reduced gas content of each coal seam. In the northern part, the low gas content may result from the combined effects of the geological structure, thickness of overlying unit, burial depth and coal thickness. In the southern part, the gas content of coal seams is controlled by the combined effects of relatively favorable factors including fewer normal faults, thicker overlying unit, high burial depth and thick coal seam. The variation of the gas content for the coal seams is a comprehensive reflection of geological factors with each coal seam has its own pattern of gas distribution and this should be considered for the future coalbed methane exploration and development studies in Soma Basin.

中文翻译：

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土耳其索马盆地 Kınık 煤田煤层含气量分布的地质控制

摘要 中新世索马煤盆地可能是土耳其低阶煤层气最有前景的地区之一。迄今为止，尚未对索马盆地 Kinik 煤田煤层的煤层气潜力进行充分研究。以索马Kinik煤田37口煤探井84个煤样的地质资料和实验结果为基础，对kP1和kM2煤层含气量分布及其地质控制进行了系统调查。盆地。根据煤的性质和瓦斯含量对样品进行了分析。气体含量通过基于罐解吸试验的直接法测量。kP1 和 kM2 煤层的瓦斯含量分别为 0.90 至 2.61 立方米/吨和 0.51 至 3.86 立方米/吨，按接收情况计算，两条缝均呈自西向东增加的趋势。kP1 和 kM2 煤层的扩散率值分别从 2.84 × 10-5 min-1 到 56.4 × 10-5 min-1 和从 0.64 × 10-5 min-1 到 54.3 × 10-5 min-1 不等. kP1 煤层瓦斯含量与煤的性质无关，而kM2 煤层瓦斯含量与固定碳含量和总热值呈正相关，与水分和灰分含量呈负相关。研究区正断层发育，对瓦斯运移具有重要作用，引起瓦斯散失，各煤层瓦斯含量降低。北部地区含气量偏低，可能是受地质构造、上覆单元厚度、埋藏深度和煤层厚度综合影响。在南部，煤层瓦斯含量受正断层较少、上覆单元较厚、埋藏深度大、煤层厚等相对有利因素的综合影响。煤层瓦斯含量的变化是地质因素的综合反映，每个煤层都有其自身的瓦斯分布格局，这是今后索马盆地煤层气勘探开发研究的重点。