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Geoscience ›› 2008, Vol. 22 ›› Issue (5): 794-802.

• Engineering Geology and Environmental Geology • Previous Articles     Next Articles

High Resolution Sequence Framework,Depositional Pattern and Litho-Stratigraphic Traps of Hanjiang Formation in Panyu Uplift,Pearl River Mouth Basin

  

  1. 1School of Energy Resources, China University of Geosciences, Beijing100083, China; 2Shenzhen Institute of CNOOC Limited,Guangzhou, Guangdong510240, China
  • Received:2008-03-27 Revised:2008-06-15 Online:2008-10-20 Published:2009-11-12

Abstract:

Panyu uplift is an important oil and gas-bearing district of the Pearl River Mouth Basin. Hanjiang Formation in the area can be divided into three thirdorder sequences, which are bonded by unconformities characterized by truncation or onlap contacts and its relevant conformity surfaces. Based on the flooding surfaces of the forth-order cycles, they can be subdivided into eleven forthorder sequences or systems tracts. The upper two forthorder sequences of the SQhj1 sequence consist of two sets of deltaic deposits showing progradational foresets. The lowstand systems tracts of the SQhj2 mainly include incised valley fills and lowstand wedges. Seismic sedimentology and paleo-geomorphology analysis, based on the 3D seismic data and combined with logging-restricted data, has revealed the facies distribution and revolution of important forth-order sequences in the area. The deltaic mouth bar and underwater distributary channel sandstones of the highstand systems tracts, incised channel and lowstand wedge deltaic sandy bodies and shoreline or beach sandbars comprise the major reservoirs in the study area. They are capped by overlying transgressive mudstones,so favorable reservoir and seal assemblages are formed. The economically important litho-stratigraphic traps could be formed around the onlap slope belts and the low slope or slope-break zones.

Key words: sequence framework, seismic sedimentology, litho-stratigraphic trap, Hanjiang Formation, Panyu low uplift

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