库车坳陷北带输导断裂类型及其物理模型

Gas transport types and physical simulation of faults in the northern belt of Kuqa Depression

库车坳陷北带发育的断裂按其与构造层的关系可以划分为穿盐断裂、盐下断裂、盐上断裂和盐内滑脱断裂4种类型,穿盐断裂和盐下断裂决定了主要目的层圈闭的含油气性。物理模拟实验研究表明,断裂活动时期断穿区域性盖层的穿盐断裂不是油气运移的有效通道,多为散失通道,而通烃源岩与圈闭且不切穿紧邻圈闭之上区域性盖层的盐下断裂为有效的油气运移通道。

According to the correlations between the faults developed in the northern belts of Kuqa depression and the structural layers, the faults could be divided into 4 types, including cross-salt fault, sub-salt fault, supra-salt fault and inner-salt detachment fault, in which, the cross-salt fault and sub-salt fault determine the oil and gas bearing potentiality in the targeted traps. Physical simulation indicate that cross-salt faults cutting through regional cap rocks during faults activity are oil and gas leakage pathways, rather than effective passageways, whereas the sub-salt faults that near the source rock and traps without cutting through the cap rocks overlying the traps are effective oil and gas transporting pathways.