压扭性盆地石油地质特征

通过对世界上压扭性盆地的成盆机制、演化模式和油气地质特点分析，总结压扭性盆地具有6个方面的石油地质特征：①压扭作用期间盆地的沉积速率较高，一般形成较厚的粗碎屑沉积，它们常构成很好的油气储集层；②盆地的烃源岩往往来自于前压扭期形成的富含有机质的岩石，但在强烈的压扭作用期间，在冲断带的前缘深坳陷（前渊）中有可能发育深水一半深水相的烃源岩；③压扭（张扭）作用期间形成的雁行式褶皱（包括背斜和断鼻等）往往是很好的油气圈闭；④压扭作用易于成藏；⑤压扭作用可以促进有机质的成熟生烃作用；⑥压扭性盆地的周边冲断带是油气赋存的有利部位。

Petroleum Geological Characteristics of Compresso-Shear Basin

The basin-formed mechanism,evolution model and petroliferous geological features of compresso-shear basins in the world are analyzed.by which six aspects of the features are summarized as follows: 1) in the compresso-shear process,the sedimentary speed of basin is high,forming thicker coarse-grained clastic rocks which normally shape good petroleum reservoir;2) the source rocks of basin tend to coming from the organic matter-enriched rocks formed in pre-compresso-shear stages,except that in intense compresso-shear process,deep water-semi deep water source rocks are possibly developed in frontal of deep depression(fore deep) of thrust belt;3) the en echelon folds(including anticline and fault-nose structure) are generally as good oil traps;4) the compresso-shear process is helpful to hydrocarbon accumulation;5) it may promote the maturity and hydrocarbon-generating process of organic matter,and 6) the thrust belts in the surrounding areas of compresso-shear basin are favorable domains for petroleum concentration.