塔里木盆地是中国西部最具勘探潜力的油气田。该盆地巴什托地区泥盆系克孜尔塔格组作为兼探对象,在部分井区获得了可喜的工业油流。统计结果表明,研究区内目前已发现目的层段油气藏均沿断层分布,且后期构造运动对研究区的构造形态及油气藏进行了大规模的调整改造,故构造运动及断裂活动在成藏过程的作用不可忽视。为了研究研究区的成藏机制,本文对目的层段的断裂系统进行了分析。本文在层位综合标定的基础上,根据研究区的地质特点,采用主体构造解释法(断层三维立体展布法)及相干分析技术对断层进行了系统解释。解释过程中,充分利用地震剖面的压缩、放大、任意线组合、等时切片、相干体切片及自动追踪、种子点追踪、立体显示等多种技术,提高解释的精度和效率。解释结果表明,研究区内发育巴什托1号和2号两条主干断层,其主要活动期为海西早期—加里东晚期。另外,主干断层附近有一系列的派生断裂,研究区东部断裂比较发育,向西逐渐减弱。从构造上说,巴什托构造位于巴什托断裂的上升盘,其泥盆系克孜尔塔格组油藏顶面1号和2号构造为一长轴背斜,构造南翼较陡。本研究为研究区的下一步油气探勘工作提供了新思路。

Tarim Basin is the largest petroleum potential resource in the west of China. In a co-prospecting project, some wells of the Devonian Kezirtag formation in Bashituo area give encouraging industrial oil flows. The statistical results show that the reservoirs of the target segments in the study area are all located along the faults, and the later tectonic movements produce a large-scale adjustment and reform of the structural form and reservoirs. So the tectonic movement and faulting in the accumulation process play important roles. In order to better understand the accumulation mechanism of the study area, the fault system of the target segments is analyzed. In this paper, the law of the main structural interpretation (the three dimension spread law of fault) and the coherence analysis are applied to the fault interpretation based on the comprehensive calibration of layers and the geological features in the study area. In the interpretation process, the compression, the enlargement, the combination of any lines, the isochronal slices, the coherent slices, the automatic tracking, the seed point tracking and the stereoscopic display of the seismic section are fully used to improve the accuracy and the efficiency of the fault interpretation. The results show that Bashituo's 1 and 2 of the main faults are developed in the study area, and the main active period is from early hercynian to later caledonian. At the same time, a series of grade derived fractures are developed near the main faults. The faults are more developed in the east of the study area, and are gradually weakened towards the west. In view of the tectonics, the Bashituo structure is located in the uplift side of the Bashituo fault, and the reservoir superface structures 1 and 2 with steep south wings are of long axis anticline. This study provides a new way for the future exploration of the study area.