Feature of Multi Sediment-source Filling during the Late Oligocene at Baiyun Depression in the Deep-water Region, the Northern South China Sea

Abstract

Abstract:

This article firstly makes a comprehensive analysis about the features of depositional system during the Late Oligocene of Baiyun depression in the deepwater region of northern South China Sea, using single well facies, seismic facies and seismic velocitylithology analysis. Study shows that transgression started developing during the Late Oligocene. Probably, the sea water entered from the east and overlaped towards the west. Main depositional system tracts of Zhuhai sequence displays the consistent feature of multi sedimentsource filling. There is a large scale S-type progradational reflection configuration prograding to the south in northeast of the depression (around BY1-2)Another large scale S-type progradational reflection configuration prograding to the northeast exists in the south of the depressionIn northwest of the depression(Well BY1-1 and the west area of it), there are two middle-sized brush-like progradational reflection configurations prograding to the south . According to the sandstone index distribution converted from seismic velocitylithology analysis, there are several relative high sandy areas in the eastern part, northern boundary, west corner, southwest and southeast direction of the depression.There are three palaeodrainage patterns in LST: northern palaeodrainage pattern (fluvialfan delta), southern palaeodrainage pattern (fan delta) and eastern palaeodrainage pattern (fan delta). There are two palaeodrainage patterns in HST: northern palaeodrainage pattern (fluvial channels-fan delta) and western palaeodrainage pattern (delta-fan delta facies). The feature of multi sedimentsource filling shows that the depositional environment during the whole Late Oligocene likely was restricted sea circumstance. The fan delta front in the gentle slope of southern Panyu low uplift and delta regime in the long axis direction of southern Baiyun depression have great significance for exploration.

Key words: Northern South China Sea, deepwater region, seismic velocitylithology analysis, seismic facies, sedimentary facies, multi sedimentsource filling

CLC Number:

TE121.3

LIU Zhen, ZHANG Gong-Cheng, LV Rui, SHEN Huai-Lei, GUO Rui, TIAN Ji-Xian. Feature of Multi Sediment-source Filling during the Late Oligocene at Baiyun Depression in the Deep-water Region, the Northern South China Sea[J]. Geoscience, 2010, 24(5): 900-909.

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