开平向斜地质构造特征及其对瓦斯赋存的控制

基于地质构造是控制瓦斯赋存的最重要因素，深入分析了开平向斜地质构造特征及其分异性，并探讨了构造对瓦斯控制规律。结果表明：开平向斜是一个轴向NE的不对称向斜，北西翼地层倾角陡立，局部直立或倒转，甚至发育推覆构造；而南东翼地层较平缓，一般倾角为10°~15°，被一系列轴向NW的次级褶曲复杂化。受构造控制，煤层经历了多期瓦斯生成过程，目前的瓦斯现状是构造综合作用的结果，开平向斜可以明显分为两大瓦斯区：北西翼的高瓦斯区和南东翼的低瓦斯区，而同一瓦斯区中，由于局部构造的不同，瓦斯赋存状态也存在明显的差异，表明了构造对瓦斯生成、保存与矿井瓦斯涌出存在重要控制作用。

Geological structural characteristics and their control action on gas occurrence in Kaiping syncline

Based on geological structural characteristics being the most important factor of gas occurrence,this paper analyzed geological structural characteristics and its differentiation in Kaiping syncline,also investigated structure control rules on gas occurrence.The results show that Kaiping syncline is an asymmetrical syncline structure with NE axial direction and its stratigraphic dip is steep,in some parts,upright or overturned,even the nappe structure developed in Northwestern part；in Southeastern part of Kaiping syncline the stratigraphic dip is flat with 10°-15°,which become complicated under the control action of the secondary fold in NW axial direction.Controlled by structures,the coal seam has undergone multiphase gas generation processes,and the current status of gas is a result of the combined action of structures.Kaiping syncline area can be divided into two obvious gas areas:high gas area in northwest limb and low gas area in southeast limb.In one gas area,because of the difference of local structures,there are obvious differences in the gas occurrence state,which shows the structure is important for the control action of gas generation,preservation and mine gas emission.