塔西南坳陷寒武系含油气系统及勘探目标

The Petroleum System and Objective Interval for Exploration of Cambrian in Southwest Depression of Tarim Basin

通过研究古构造格局的演化，结合烃源岩热演化史、油气运聚史进行分析，首次在塔西南坳陷内划分了出寒武 系含油气系统。通过对已知油气藏成藏过程和圈闭形成期的分析，确定了出含油气系统关键事件和关键时期，认为海西 运动期以聚油为主，喜马拉雅运动期以聚气为主；寒武系含油气系统与其它含油气系统在垂向和平面上有复杂的组合 关系；最有利的油气勘探区带为群库恰克扭褶带和玛扎塔格扭褶带；主要勘探目标为海米塔格构造带的海米面背斜，其 次为巴楚隆起西端的家武系盐下圈闭——结东断鼻。

The study of evolution of paleostructural framework and the analysis in combination with the thermal evolution history of hydrocarbon source rock and petroleum migration and accumulation history were made, by which the Cambrian petroleum system was firstly classified. Based on known reservoir-forming processes and trap-formed period, the critical event and critical timing for shaping a petroleum system were determined. The petroleum system assumes complex combinations vertically and horizontally compared with the others. This paper suggested that the most favorable zones for oil/gas exploration would be Qunkuqiake and Mazatag torsional and folded belts, and the major prospecting oh-' jective might be Haimixi anticline in Haimitag structural belt, the secondary one be Jiedong fault-nose within Cambrian 'salt base' trap in west end of Bachu uplift.