The depositional pattern and dynamic principle of chasmic stage in the northwestern margin of Beibu-gulf Basin

Abstract

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

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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