MOE Key Lab of Coalbed Methane Resources and Deposition Process, China University of Mining and Technology
School of Safety Science and Engineering, Henan Polytechnic University

基于瓦斯赋存构造逐级控制理论和区域构造演化的研究,探讨了淮北矿区祁东井田成煤后不同期次和性质的构造应力场下形成的构造对瓦斯赋存的控制作用。结果表明:燕山期是控制瓦斯赋存的关键时期,该期NW—SE向水平挤压应力场作用下形成的一系列断层和褶皱奠定了现今淮北矿区的构造格局和瓦斯赋存特征;在成煤后的构造演化历程中,EW向构造表现为前期挤压、后期拉张,有利于瓦斯逸散,NE—NNE向构造大致经历了挤压剪切—拉张—挤压3个演化过程,NW向构造一直处于挤压状态;NW向构造对瓦斯保存最有利,NE—NNE向构造次之,EW向构造最差。祁东井田不同期次形成的不同性质的断层改变了井田内的瓦斯赋存格局,致使瓦斯赋存呈现出南北分异、东西分块的特点;各断块间瓦斯赋存特征及控制因素不相同,每个断块都可视为独立的瓦斯地质单元。

Based on gradual control theory of gas deposition structure and regional structure evolution, the paper discussed gas deposition controlled by the struct ure formed under different period and different property structure stress field after coal formation of Qidong Minefield in Huaibei Mining Area.The results showed that Ya nshan period was the key period to control the gas deposition, series faults and folds formed under a role of a NW- SE horizontal extrusion stress field settled the struc ture pattern and gas position features in Huaibei Mining Area.In the structure evolution process after the coal formation, the EW directional structure was in extrusion at the initial period and in tensile at the late period and was favorable for the gas dissipation.A NE- NNE directional structure roughly experienced three evolution process es, including the extrusion shearing-tensile-extrusion and the NW directional structure was always in an extrusion state.The NW directional structure was the most favor able for gas keeping, NE- -NNE directional structure was the second and the EW directional structure was the worst.The different property faults formed in different peri ods in Qidong Minefield changed the gas deposition pattern within the minefield and caused the gas deposition features differentiation in the south and north, and partiti on in the east and west. The gas deposition features and control factors between each fault and block would be different and each fault and block would be an independ ent gas geological unit.

国家自然科学基金重点资助项目(U1361207)；国家科技重大专项资助项目(2011ZX05040-005)；