济阳坳陷邵家洼陷区断裂特征及其地质意义

邵家洼陷区是济阳坳陷沾化凹陷的一个次级构造单元,它是受张性及张扭性应力控制的箕状断陷.第三纪至第四纪期间郯庐断裂带的右旋剪切运动为邵家洼陷区断裂活动的区域背景.洼陷区的幕式断裂活动使得断裂平面组合特征和剖面特征复杂多样,导致了断裂体系的复杂性和构造类型的多样性.基底断层的活动对邵家洼陷区的沉积充填和构造格局起着重要的控制作用,基底断层的产状又控制着盖层断层的样式.各种类型的断层对油气运聚的影响不同,基底断层主要使烃源岩层与储集层相连通而有利于垂向油气运移,盖层断层则形成众多断块或断鼻构造而有利于油气成藏.

Features of the faults in Shaojia subsag zone of Jiyang Depression and their geological significance

Shaojia subsag is one of the substructural units of Zhanhua sag in Jiyang Depression. It is a halftraben-like depression controlled by tensional stress and tension-torsional stress. The dextral shear movement of Tancheng-Lujing fault zone in Tertiary to Quaternary is the general tectonic setting of Shaojia subsag. The episode fault movement in the zone results in the complex fault system and the diverse structural patterns. The movement of sole faults has important controlling effect on the sequence-stratigraphic framework and the structural framework of Shaojia subsag. The attitude of the sole faults controls the fault pattern of cover faults. Different types of faults have different effects on the migration and accumulation of oil and gas. Sole faults connect the reservoirs and the source rocks, and this is favorable to the vertical migration of oil and gas. The cover faults form many fault blocks and nose structures, and this is favorable to the accumulation of oil and gas.