【摘要】 煤体结构是影响煤层气开发效果的重要因素,准确评价煤体结构是煤层气勘探开发研究的一个关键问题。根据煤体破裂的程度,参照《防治煤与瓦斯突出细则》中煤的破坏类型划分方案,将煤体结构划分为完整结构、块裂结构、碎裂结构、碎粒结构和糜棱结构,前两者为原生结构煤;后三者为构造煤。以沁水盆地南部晋城矿区典型矿井为对象,分析了不同煤体结构的测井响应特征。研究发现:随着煤体破碎程度的增高,井径、声波时差、补偿中子、自然电位值和自然伽马响应逐渐增强,电阻率、密度响应逐渐减弱;原生结构煤的自然伽马、自然电位、补偿中子、井径和声波时响应较弱,电阻率和密度响应较强,构造煤反之。更多还原

【Abstract】 The coalbody structure would be an important factor affected to coalbed methane development effect and an accurate evaluation of the coalbody structure would be a key issue of the study on the coalbed methane exploration and development. According to the coal breaking degree and based on the coal failure type division plan stipulated in Regulations on Coal and Gas Outburst Prevention,the coalbody structure was divided to a completed structure,a block breaking structure,a broken structure,broken partical structure and mylonite structure.The first two structures would be primary structure coal and late three structures would be structure coal.Based on a typical mine in Jincheng Mining Area at the south part of Qinshui Basin as an object,the paper analyzed the logging response features of different coal structure.The study showed that with coal broken degree increased,well diameter,acoustic time difference,compensated neutron,natural potential value and natural gamma response would steadily increased and electrical resistivity and density response would be steadily reduced.The natural gamma,natural potential value,compensated neutron,well diameter and acoustic time difference response of the primary structure coal were quite weak,the electrical resistivity and density response would be quite high and the structural coal was on the contrary.更多还原