珠江口盆地21Ma和13.8Ma陆架边缘三角洲对比

doi:10.11743/ogg20140512

Abstract

Abstract:

Shelf-margin delta,an important type in the dynamic classification of delta,has become the focus of science researches and hot spot in oil & gas exploration.According to the driving factors,shelf-margin delta can be categorized into two types,namely sediment supply-driving delta and accommodation-driving delta.The Pearl River Mouth Basin had favorable geological condition for shelf-margin delta development at 21 Ma and 13.8 Ma.Shelf-margin deltas(21 Ma and 13.8 Ma)are analyzed in respects of topography,relative sea-level change and sediment supply through integration of well logging,logging curves and seismic data.The forming condition analysis shows that the delta at 21 Ma is of sediment supply-dri-ving type,while the delta at 13.8 Ma is of accommodation-driving type.Although SQ2 and SQ9 are obviously different in respects of topography,relative sea-level change and sediment supply,they both are type I sequences,and have well-developed lowstand fans,shelf-margin delta and delta-front slumping deposits,which belonging to stable shelf-margin deltas.

Key words: sediment supply-driving type, accommodation-driving type, slope break, shelf-margin delta, Pearl River Mouth Basin

CLC Number:

TE121.3

Yi Xuefei, Zhang Changmin, Li Shaohua, Du Jiayuan, Luo Ming, Li Xiangyang. Comparison between shelf-margin delta of 21 Ma and 13.8 Ma in Pearl River Mouth Basin[J]. Oil & Gas Geology, 2014, 35(5): 670-678.

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Comparison between shelf-margin delta of 21 Ma and 13.8 Ma in Pearl River Mouth Basin

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