塔里木盆地巴楚隆起油气保存条件与勘探方向

Hydrocarbon preservation and exploration in Bachu Uplift of Tarim Basin

巴楚隆起经历了加里东中期(晚奥陶世末)、海西早期(中泥盆世末)、海西晚期(晚二叠世)、印支—燕山和喜马拉雅等多次构造运动,其中喜马拉雅中期运动是其最重要的隆起形成期。不同期次的构造演化对该区油气保存条件影响极大。中寒武统膏盐岩、中、下石炭统泥岩、下二叠统库普库兹满组泥岩是区内较好的区域性盖层。综合分析盖层特征及油气保存条件影响因素,认为巴楚隆起平面上存在巴楚隆起南缘和巴楚隆起东部2个保存条件较好的部位,纵向上存在中、下寒武统盐下保存条件比较好的层位,巴楚隆起南缘、巴楚隆起东部及中下寒武统盐下是下步有利的勘探区带。

The Bachu Uplift of the Tarim Basin had experienced several tectonic movements during the middle Caledonian （the end of the Late Ordovieian）, the early Hercynian （the end of the Middle Devonian）, the late Hercynian （the Late Permian）, the Indosinian-Yanshanian and the Himalayan, among which the middle Himalayan was the most important stage for uplift formation. Different stages of tectonic movements had great effects on hydrocarbon preservation conditions. The Middle Cambrian gypsum-salt rocks, the Middle-Lower Carboniferous mudstones and the Lower Permian Kupukuziman Formation mudstones were good regional cap rocks in the region. Based on integrated analyses of seal properties and hydrocarbon preserving conditions, it was pointed out that there were 2 locations with better conditions for hydrocarbon preservation in the uplift： the southern margin and the east part. Vertically, horizons under the Middle-Lower Cambrian salts were favorable for preservation. Therefore, the southern margin and the east part of the Bachu Uplift as well as the Middle-Lower Cambrian subsalt reservoirs are the favorable targets for future petroleum exploration.