北部湾盆地西北缘裂陷期沉积模式与动力学机制

摘要/Abstract

摘要： 北部湾盆地西北缘是重要的生烃富集区域，古近纪为主要裂陷期，发育陆源碎屑岩沉积；垂向上粒序变化呈粗—细—粗，色序韵律为红—暗—杂，沉积环境由陆相冲积体系逐渐过渡到湖泊体系再到河流、三角洲体系，为一个完整的沉积旋回。在此基础上，分析了沉积演化史并建立了始新统流沙港组沉积模式，初步探讨了影响沉积体系形成和发育的动力学机制为构造动力、充填动力和气候动力共同作用的结果：从古新世到渐新世，构造动力强度不断减弱而充填动力基本保持稳定；同时在气候动力调节下，涠西南凹陷和海中凹陷沉积速率在始新统流沙港组二段和渐新统涠洲组沉积时期均超过100m/Ma，塑造出古近系最有利的两套沉积储层。

关键词: 动力学机制, 北部湾盆地, 西北缘, 裂陷期, 沉积模式

Abstract: The northwestern margin of Beibu-Gulf Basin, a significant area for hydrocarbon generation and accumulation, is characterized by main chasmic stage of Paleogene and deposition dominated by terrigenous clastic rocks. With vertical grain-size and color variation showing coarse-fine-coarse and red-dark-motley respectively, the sedimentary environment gradually transmits from continental alluvial, lacustrine, fluvial to delta environment, forming a whole sedimentary cycle. The sedimentary history was analyzed and Eocene Liushagang Formation depositional pattern is established. Moreover, the paper preliminarily considers that the dynamic principle determining sedimentary system formation and development is jointly affected by tectonic power, filling power and climatic power. From the Palaeocene to Oligocene, the tectonic power was continually decreasing and the climatic power kept stable; while adjusted by the climatic power, the deposition rates of the Weixinan depression and the Haizhong depression were more than 100m/Ma during the deposition of both 2th member of the Eocene Liushagang Formation and the Oligocene Weizhou Formation, creating the most two favorable sets of the Paleogene reservoirs.

Key words: Jiang Hui1, Yu Xinghe

姜　辉, 于兴河. 北部湾盆地西北缘裂陷期沉积模式与动力学机制[J]. 中国石油勘探, 2016, 21(4): 93-98.

Jiang Hui, Yu Xinghe. The depositional pattern and dynamic principle of chasmic stage in the northwestern margin of Beibu-gulf Basin[J]. China Petroleum Exploration, 2016, 21(4): 93-98.

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