柴北缘西段新生代弧形构造带演化历史及成藏过程

本文在钻井和二、三维地震数据精细解释的基础上,详细研究了柴北缘西段晚新生代弧形构造带演化历史和油气成藏过程。认为柴北缘西段是由一系列沿造山带前缘展布的弧形逆冲断裂和褶皱组成的弧形构造带。晚新生代以来的构造演化具有自山前向盆内扩展,东西两侧向中间传播的特点,油气运聚与构造演化过程紧密耦合。各弧形构造带两侧形成时间早,生储盖配置好,且具有古构造背景,是油气运聚的长期指向,应是下一步优先勘探目标。

Evolution history and hydrocarbon accumulation process of Late Cenozoic arcuate tectonic zone in the west section of the northern margin of Qaidam Basin

Based on the data from field outcrops, drilling wells and fine seismic data interpretation, combined with analysis on the paleogeography, this paper presents a detailed study on late Cenozoic tectonic evolution and reservoir generation process in the west section of the northern margin of Qaidam Basin. The results suggest that this section consists of a series of arc-shaped thrust faults and folds along the front of the range. Since late Cenozoic, its tectonic evolution is featured by spreading from range-front to interior of the basin and propagating from either side to the middle. The hydrocarbon accumulation coupled well with the tectonic evolution process. Both sides of each arc-shaped tectonic zone formed earlier, with good combination of generation, storage, and cover as well as the background of ancient tectonics. These places indicate long-term direction of hydrocarbon migration and accumulation, which should be the priority of exploration targets in the future.