珠江口盆地惠州凹陷珠江组K系列陆架砂脊沉积演化与成因

doi:10.11743/ogg20140312

Abstract

Abstract:

Based on the principles of seismic sedimentology and sequence stratigraphy,a high resolution sequence stratigraphy framework was established for the MFS18.5-SB17.5(K set)in Huizhou sag of Pearl River Mouth Basin with 8 sand layers or sand groups recognized.Based on the time-slices of seismic attributes under the constraint of sequence boundary surface,maximum flooding surface and the sub-flooding surface,we studied in detail the seismic facies and sedimentary facies in combination with the well logging and drilling data,cores and regional sedimentary backgrounds.Two depositional systems were recognized in K set of Zhujiang Formation in Huizhou sag,namely the river mouth bar of delta front-sheet sand depositional system in the west,and the shelf ridges system in the southeast.The shelf ridges are characterized by the follows:being located in the front of delta lobes;parallel to the coast in NEE direction,and in stripped distribution;and thinning towards to both edges.Some ridges are thick in one limb and having sharp edges,while the other limb thinning gradually and having irregular edges.This paper discussed the formation mechanism of those striped ridges on the shelf,and pointed out that the striped ridges were resulted from transportation and transformation of delta front sands by waves.And they laterally change into mudstone,thus are important domains for exploration of lighologic reservoirs.

Key words: delta front, shelf sand ridge, Zhujiang Formation, Huizhou sag, Pearl River Mouth Basin

CLC Number:

TE121.3

Ding Lin, Zhang Changmin, Du Jiayuan, Shi Hesheng, Luo Ming, Wang Xiangshu, Jia Peimeng. Depositional evolution and genesis of K set of shelf sand ridges in the Zhujiang Formation of Huizhou sag,Pear River Mouth Basin[J]. Oil & Gas Geology, 2014, 35(3): 379-385.

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Depositional evolution and genesis of K set of shelf sand ridges in the Zhujiang Formation of Huizhou sag,Pear River Mouth Basin

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