新安煤田新义井田深部勘查区二1煤煤层气地质特征

基于新义井田深部勘查区煤田地质勘查成果，分析了该区构造和二₁煤层展布特征，研究了二₁煤储层特征、煤层气含量及其分布规律、煤层气赋存条件。研究认为，勘查区二₁煤变质程度高，有利于煤层气的生成；煤储层孔隙度较高、围岩封闭性好，有利于煤层气赋存；煤体结构遭到严重破坏不利于煤层气运移；属正常压力、低渗煤储层。煤层气含量与埋深呈正相关趋势，DF₁断层为煤层气逸散通道。

Geological characteristics of coal seam gas in Ⅱ1 coal seam in deep exploration area of Xinyi Mine Field，Xin′an Coalfield

Based on the results of coalfield geological exploration in the deep exploration area of Xinyi Mine Field，the structure of the exploration area and the distribution characteristics of Ⅱ₁ coal seam were analyzed，and the characteristics of Ⅱ₁ coal reservoir，the content and distribution of coalbed methane，and the occurrence conditions of coalbed methane were studied.It was considered that the high degree of metamorphism of Ⅱ₁ coal in exploration area was beneficial to the formation of CBM；the high porosity of coal reservoir and good sealing of surrounding rock were beneficial to the occurrence of CBM；the serious destruction of coal structure was not conducive to the migration of CBM；it belongs to normal pressure and low permeability coal reservoir.There was a positive correlation between CBM content and burial depth，and DF₁ fault was a CBM escape channel.