摘要
为研究Great South盆地的油气分布规律,分析了该盆地构造演化与油气成藏之间的关系。结果显示:该盆地划分为前裂谷期、裂谷期、漂移期与新的板块边界形成期4个构造演化阶段。该盆地构造演化对油气藏的形成起到了重要的控制作用,主力烃源岩的形成与分布受当时盆地构造位置与控凹断层的控制,主要分布于早期断陷湖盆的控凹断层下降盘,而断陷湖盆白垩系发育的储层是盆地最主要的储层。同时,构造演化也控制了与断垒、古基底凸起相关的圈闭发育及油气的运聚成藏,圈闭多具有继承性,可分为西部斜坡、中央凹陷与东部凸起三个构造带。垂向上,油气主要在断层比较发育的白垩系地层聚集成藏。平面上,油气以近源成藏为主,中央凹陷圈闭带为最有利的油气聚集带。
In order to study the petroleum distribution regularity of Great South Basin, the authors analyzed the relationship between the tectonic evolution and the hydrocarbon accumulation . The result shows that the tecton- ic evolution of the Great South Basin has been divided into four stages including of the pre-rift, rift, drift and forma- tion of new plate boundary. The tectonic evolution has played an important role in the formation of hydrocarbon ac- cumulation. The formation and distribution of main source rocks are controlled by the tectonic position and control- ling-depression faults of the basin, and develop mainly on the downthrown sides in early rift lake basin. While the main high-quality reservoirs in the Great South Basin distributed in the Cretaceous rift lake basin. Meanwhile, the traps associated with the faulted horst and the basement salient, and the hydrocarbon migration and accumulation, are controlled by tectonism. Most of the traps have inheritance, and can be divided into western slope, central de- pression and eastern embossment structural belts. Vertically, the oil and gas mainly accumulated in the Cretaceous strata where faults are developed. Laterally, the oil and gas central depression is the most favorable accumulation zone. mainly accumulated near the source rocks, and the
出处
《世界地质》
CAS
2015年第2期460-467,共8页
World Geology
基金
国家重大专项"亚太地区油气资源评价及未来战略发展方向"(2011ZX05028-006)
