再论中国西部逆冲滑脱拆离断层前锋带的构造样式——兼论其与油气的关系

Review of Structural Styles of Front Belts of Decollement Thrusts in Western part of China,with Discussion on the Relationship of them with Hydrocarbon

逆冲拆离断层系统又称薄皮构造,一般可分为根带、中带、前锋带及外缘带四个部分。其前锋带又可划分出滑脱型、褶皱型、前冲型和反冲型等几类构造样式,各类构造样式还可再分成若干种。例举了各种中国西部存在的典型构造样式。在库车盆地还发现双重滑脱逆冲拆离断层前锋构造存在,在其他盆地仅发现单层逆冲拆离断层前锋带的构造样式。逆冲滑脱拆离断层前锋带构造环境中油气丰富(典型的如克拉2气田),具有良好的勘探前景。

A decollement thrust system,also called as thin-skinned structures,can be divided into sole,middle,front and periph- eral belts.The front belt can be divided also and subdivided into a variety of structural styles.Varied typical styles existing in the western part of China are exampled in this paper.A type of front belt structure of duplexing decollement thrust is also discovered in Kuche Basin but the style of single-bedded de- collement thrust is merely found in ether basins.There is good exploration prospect in the environment where abundant hydro- carbon exists in the front-belts of decollement thrusts,such as the typical Kela-2 Gas Field.