1.School of Resources and Environmental Engineering,Guizhou University,Guiyang ,China; 2.School of Mining Engineering,Taiyuan University of Technology,Taiyuan ,China

为揭示古交矿区煤层气分布规律及其主控因素，综合野外地质勘查、煤矿采掘地质、煤层气井相关资料及煤心测试数据等资料，讨论了构造演化、构造形态、断裂分布、埋深、煤体结构、煤层厚度、直接顶板性质等因素对煤层气分布的影响。结果表明:构造条件和埋深是控制矿区内煤层气分布规律的主因，并据此将矿区划分为平缓单斜浅埋、平缓单斜深埋、陡峭单斜和复杂褶皱4种煤层气分布模式，平缓单斜浅埋区和平缓单斜深埋区为煤层气富集有利区。平缓单斜浅埋模式下，埋深小、渗透性好是煤层气井高产的有利条件；平缓单斜深埋模式下，埋深小、含气量高有利于煤层气井高产。

In order to reveal the distribution law and the main controlled factors of the coalbed methane in Gujiao Mining Area, comprehensive field geological survey, mining and excavation geology, coalbed methane well related information as well as coal core test data and other information, the paper had a discussion on the structure evolution, structure morphology, crack distribution, depth, coal structure, seam thickness, direct roof property and other factors affected to the coalbed methane distribution. The results showed that the structure condition and the depth would be the main factor to control the distribution law of the coalbed methane within the mining area. Thus the mining area was divided to four coalbed methane distribution modes of the gently-dipping monoclinal shallow overburden, gently-dipping monoclinal deep overburden, steep monoclinal and complicated fold. The gently-dipping monoclinal shallow overburden and gently-dipping monoclinal deep overburden would be the enrichment favorable zone of the coalbed methane. Under the mode of the gently-dipping monoclinal shallow overburden, the shallow depth and good permeability would be the favorable condition to the high production of the coalbed methane well. Under the mode of the gently-dipping monoclinal shallow overburden, the shallow depth and high gas content would be favorable to the high production of the coalbed methane well.