塔北隆起YM1-2构造带古生界断裂特征及成因机制分析

Paleozoic Fault Feature and Its Formation Mechanism in YM 1-2 Block District of Tabei Uplift

YM1-2构造带位于塔北隆起西部英买力低凸起构造单元内,整体表现为一寒武系盐上大型穹隆背斜,形成于海西期,定型于印支期。期间经历多期构造运动,发育有大量断裂,构造样式多样,成因机制也非常复杂。通过蚂蚁追踪等技术的应用,对YM1-2三维区断裂进行精细解释,能有效指导对断裂的刻画与认识。首次把研究区内所有断裂划分为4期,即中加里东期、早海西期、晚海西期、海西—印支期,并对每期断裂的形成机制进行深入分析,为断裂与油气成藏关系的研究提供重要依据。

The YM 1-2 structural belt in the Yingmaili low bump tectonic unit of the western Tabei uplift is a large dome anticline on the Cambrian salt.The anticline was formed in the Haixi period and was shaped in the Indosinian period.Several periods of tectonic movements made a lot of faults with kinds of tectonic styles formed.The mechanisms of fault formation are complicated.The application of the ant tracking technology to interpret the faults in the Yingmai 1-2 3D block gives effective guidance to describe and understand these faults.In the work area,we divide all faults into four phases,i.e.middle Caledonian,Early Hercynian period,late Hercynian,and Hercynian-Indosinian.We illustrate the formation mechanism of each fault at different periods.This result will provide the evidence for building relationship between faults and hydrocarbon accumulation.