塔里木盆地巴楚-麦盖提地区古构造迁移特征及其意义

Significance and characteristics of paleotectonic migration in Bachu-Makit area of Tarim Basin

塔里木盆地巴楚-麦盖提地区经历了多期构造运动，准确刻画各时期古构造的形态和迁移特征对恢复该地区的构造演化过程以及指导油气勘探具有重要意义。本文结合地质和地球物理资料，应用厚度图法来反映塔里木盆地巴楚-麦盖提地区下寒武统顶界不同时期古构造面貌，探讨古构造的演化迁移过程；并利用垂向构造变动强度法来定量计算研究区构造活动程度。研究表明：1）塔里木盆地巴楚-麦盖提地区古构造西部迁移范围较大，而东部相对稳定，存在古构造相对稳定区；2）加里东-早喜山期，研究区构造活动相对稳定，晚喜山期活动剧烈，沿麦盖提斜坡一带存在多期构造活动的枢纽带；3）麦盖提斜坡东部下寒武统白云岩存在构造相对稳定区，其具有相对生烃凹陷较高的构造位置以及相对较小的活动强度，是油气运聚的有利指向区和保存区。

The Bachu-Meigeti area in the Tarim Basin experienced multi-period tectonic movement. It is of great significance to reconstruct the tectonic evolution of the area and to guide the exploration of oil and gas, which depicts accurately the shape and migration characteristics of the paleotectonic. Combined with geological and geophysical studies, applying the thickness map method to reflect the palaeotectonic of the upper boundary of the Lower Cambrian in the Bachu-Meigeti area, and discuss its migration process. And the vertical tectonic variation intensity method is used to quantitatively calculate the tectonic activity degree of the study area. The results show that： 1） In the west of the study area, there is a large-scale migration of paleotectonic, while the eastern part is relatively stable. 2） There is relatively stable of tectonic activity during Caledonian-Early Himalayan period, and strong in Late Himalayan period. A multi-stage relatively inactive zone is developed along the Maketi slope. 3） The Lower Cambrian dolomite in the eastern Maketi slope is characterized by relatively low activity intensity, and a higher structural position relative to the hydrocarbon generation depression, which is the favorable objective area for the migration and accumulation of oil and gas.