构造特征对重庆地区页岩气储量品质的影响

Influence of structural features to the reserves quality of shale gas in Chongqing region

重庆地区页岩气资源量丰富,勘探潜力巨大。区域地质构造演化活动强烈复杂,造就了重庆地区特色的"喀斯特地貌"构造,成为典型的构造型页岩气藏。复杂的地形及构造特征成为控制重庆地区页岩气品质的重要影响因素。构造对页岩气产能的控制作用导致区内页岩气品质差异明显。本文从重庆地区构造特征入手,重点探讨构造类型、断裂特征、保存条件对页岩气储量品质的影响。研究认为:在远离露头区域和断裂密集发育带、盖层厚度大且覆盖面积广、有封堵性好的断层遮挡的背斜核部平缓区和向斜构造低部位区的页岩气藏保存条件有利,储量品质更好。

Shale gas resources abound in Chongqing region,and its exploration potential is tremendous.Strong complex activityof regional tectonic evolution has created the unique characteristic of ‘karst’ structure,which makes Chongqing become the typicalstructural shale gas reservoir.Complex terrain and structural characteristics become important control influence of shale gas reservoirquality in Chongqing area.The control action of structure on shale gas production leads to significant regional difference of shale gasquality.This paper obtains from the structural characteristics in Chongqing region,mainly discusses the influences of the structuraltype,fractural characteristics,preservation condition on reservoir quality.Studies show that:the aera of the shale gas reservoir is awayfrom outcrop and intensive fractural zone,which has large cap thickness and wide coverage as well as good sealing fault block unitarea of anticline and lower part of syncline area often has good preservation condition,so does its reserve quality.