延川南区块2号煤层以半亮型煤为主,平均镜质组含量61.6％,平均灰份含量18.04％,煤体结构以块状碎裂煤为主,测井电阻率值较高,总体煤质特征较好,实测含气量较高.研究发现:2号煤层含气量与煤岩煤质特征有较强的相关性,随着灰份含量的增加而降低;深浅侧向电阻率分离程度越大,煤体受破坏程度越高,当深浅电阻率分离程度小于20％时,煤体结构为原生一碎裂结构煤;2号煤层深侧向电阻率(LLD)＞1 000Ω.m,自然伽马(GR)＜50API时,含气性较好.%The coal No.2 in the Yanchuan south block is mainly semibright coal with average vitrinite content of 61.6%, average ash content 18.04%. Coal mass structure is mainly blocky cataclastic coal, resistivity is rather high in well logging, and coal quality character is rather good in general, with higher measured gas content. The study has found that the gas content in coal seam No.2 has stronger dependency with coal lithotype and coal quality, the gas content decreasing along with the increasing of ash content. The larger the resolution of deep and shallow laterolog resistivities, the higher the coal mass degree of fragmentation; when the resolution is less than 20%, coal mass structure will be primary-cataclastic coal; when coal No.2 deep laterolog resistivity (LLD)>1 000Ωm, gamma ray (GR)<50API, has better gas-bearing property.
展开▼
