西南石油大学学报(自然科学版)

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A Study on Sedimentary Facies of Oil Group I in Member 2 of Zhujiang Formation in Wenchang 19-1 Oilfield

Lei Xiao1, Hu Yu2, Liang Wenfeng1, Liao Jijia2*, Liao Mingguang2   

  1. 1. Zhanjiang Branch,China National Offshore Oil Corporation(China),Zhanjiang,Guangdong 524057,China
    2. School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China
  • Online:2015-08-01 Published:2015-08-01

Abstract:

The aim of this paper is to study the characteristics of sedimentary facies of oil group I in Member 2 of Zhujiang
Formation in Wenchang 19 1 Oilfield,west Pearl River Mouth Basin,according to the analysis of lithology and logging
facies as well as regional structural and sedimentary background. The research shows that this stratum is littoral facies. And the
littoral facies can be divided into foreshore and shoreface,which include foreshore beach bar microfacies,shoreface beach sand
microfacies,shoreface beach mud microfacies,and flooding mud microfacies. Foreshore beach bar microfacies developed in
the intertidal zone,the lithology of which is mainly flesh pink terrigenous clastic mass bioclast limestone and gray calcareous
sandstone,with massive structure,unobvious beddings,and reverses rhythm vertically. The low range gamma ray takes the
forms of date pit,zigzag or box curves. Shoreface beach sand microfacies and shoreface beach mud microfacies developed in
the subtidal zone. The lithology is mainly fine sand and politicsilt stone,and occasional pelitic strip. with ripple bedding,poor
cementation,good sorting,and bioturbation structure. The middle range gamma ray form of shoreface beach sand microfacies
are funnel curves. The high range gamma rays of shoreface beach mud microfacies are bell curves. Flooding mud microfacies
developed in the area where the water deepened,and the hydrodynamic force weakens. And it is a set of widely scattered
fine-grained sediments,the lithology of which is mainly mudstone and silty mudstone. With lentoid bedding,and bioturbation
structure. The high range gamma rays are zigzag or bell curves.

Key words: oil group I in Member 2 of Zhujiang Formation, marine strata, clastic rocks, sedimentary facies, depositional
model