西非Termit盆地白垩纪层序充填样式的时空演化规律研究

发布时间：2018-06-29 09:44

本文选题：资源地层 + 层序地层　；参考：《地层学杂志》2016年01期

【摘要】：Termit盆地是东尼日尔盆地中极为重要的中—新生代叠合型裂谷盆地,盆地油气资源丰富,具有多期构造演化、多种构造样式、多次沉积充填等特点,形成了极具特色的层序充填样式。以层序地层与沉积学基础理论为指导,结合盆地构造演化特征,系统开展了白垩纪层序地层充填样式研究,针对不同时期盆缘古地貌背景的演变,系统总结出5种层序充填样式。研究表明,盆地宏观上经历了三大构造演化阶段,形成了多种盆缘古地貌背景,发育了5种典型的层序构成样式:早白垩世TS1层序沉积期受断裂活动控制,发育断控陡坡带和多级断阶带两种层序充填样式;晚白垩世TS2沉积期受特提斯洋和南大西洋海侵影响,沉积古环境经历了"陆—海—陆"演变,发育挠曲坡折带、简单坡折带及沉积坡折带3种充填样式。层序充填样式的差异控制了沉积体系与砂体空间展布特征,进而影响了砂体的平面分布和空间堆积样式,从而控制了油气运聚富集条件。因此,层序充填样式演化规律分析对于研究下步岩性油气藏勘探具有重要指导意义。
[Abstract]:Termit basin is an important Meso-Cenozoic superimposed rift basin in the eastern Niger basin. The basin is rich in oil and gas resources and has the characteristics of multi-stage tectonic evolution, multiple structural styles and multiple depositional filling. The formation of a highly distinctive sequence filling style. Based on the basic theory of sequence stratigraphy and sedimentology, the Cretaceous sequence stratigraphic filling style is systematically studied in combination with the tectonic evolution characteristics of the basin, aiming at the evolution of paleogeomorphic background in the basin margin in different periods. Five kinds of sequence filling styles are summarized systematically. The results show that the basin experienced three stages of tectonic evolution, forming various paleogeomorphological settings in the basin margin, and developed five typical sequences: the early Cretaceous TS1 sequence sedimentary period was controlled by fault activity. The late Cretaceous TS2 sedimentary period was influenced by the Tethys Ocean and the South Atlantic transgression, and the sedimentary paleoenvironment underwent the evolution of "land-sea-land", and developed a flexural slope break zone. There are three filling styles of simple slope break and sedimentary slope break. The difference of sequence filling style controls the spatial distribution characteristics of sedimentary system and sand body, and then influences the plane distribution and spatial accumulation style of sand body, thus controlling the condition of hydrocarbon migration and accumulation. Therefore, the analysis of the evolution law of sequence filling pattern is of great significance for studying the exploration of lithologic reservoirs in the next step.
【作者单位】：中国石油大港油田公司勘探开发研究院;
【基金】：中石油“Agadem区块白垩系成藏规律研究及勘探目标优选”(No.CNPCNP/01/2014-0700)项目资助
【分类号】：P534.53;P618.13

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