THE FORMATION AND PETROLEUM-BEARING CAPACITY OF TRAPS IN THE FRONTAL UPLIFT OF THE FORELAND BASIN——TAKING THE SHAYA UPLIFT OF THE TARIM BASIN AS AN EXAMPLE
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摘要: 前陆盆地前缘隆起是一重要油气聚集带,其特殊的构造部位及复杂的动力学演化过程决定了在该部位有多种圈闭形成和分布。塔里木盆地库车前陆盆地由三叠系、侏罗系烃源岩发育而成的成油体系中的前缘隆起——沙雅隆起区经历了海西期挤压形成雏形、印支—燕山早期挤压定型、燕山晚期—喜马拉雅中期拱张、喜马拉雅晚期挤压拗陷等构造活动阶段,圈闭形成与构造活动相关,成藏与烃源岩演化、幕式构造运动有关,因此各圈闭带的含油气性与圈闭形成期和油气运聚期的匹配有很大关系,由此划分出沙雅前缘隆起区的3级有利构造带。Abstract: The frontal uplift of the foreland basin is an important petroleum accumulation zone.Its special tectonic location and complicated dynamic evolution process have led to the formation and distribution of traps.The Shaya Frontal Uplift in the petroleum system sourced from Triassic and Jurassic in the Kuqa Basin of the Tarim Basin has experienced 4 stages of tectonic movement:compression and rudiment formation(Hercynian),compression finalization(Indosinian-early Yanshanian),arch(late Yanshanian-middle Himalayan),compression and depression(late Himalayan).Relation exists between trap formations and tectonic movements,accumulations and source rock evolutions as well as episodic tectonic movements;hence the petroleum-bearing capacity of traps is closely related to trap formation and petroleum migration stages.3 levels of favorable tectonic zones are divided in the Shaya Frontal Uplift.
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Key words:
- tectonic dynamics /
- traps /
- frontal uplifts /
- foreland basins /
- the Tarim Basin
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