Oil & Gas Geology ›› 2013, Vol. 34 ›› Issue (6): 751-757.doi: 10.11743/ogg20130606

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Microfacies characteristics and sedimentary models of the third member of Funing Formation in Zhangjiaduo oilfield

Chen Qianqian1, Ding Xiaoqi1,2, Wan Youli1, Zhang Shaonan1,2   

  1. 1. Energy College, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2012-12-31 Revised:2013-10-10 Online:2013-12-08 Published:2014-01-04

Abstract: Four types of lithofacies are identified in the 3rd member of Funing Formation in Zhangjiaduo oilfield,the Su-bei Basin,including dark mudstone,bioturbated siltstone,siltstone-fine sandstone lithofacies with argillaceous laminates and burrow as well as fine sandstone with parallel bedding.Upward-coarsening reverse rhythm is the main section structure,followed by first upward-coarsening and then upward-thinning composite rhythm,while positive rhythm is very rare.All the features of lithofacies,section structure,logging facies and cumulative grading curve show that the 3rd member of Funing Fm is typical shallow lake beach-bar facies.According to the sedimentary characteristics and spatial distributions,the reservoirs are further divided into sandstone of bar microfacies and sandstone of beach microfacies.A beach-bar sedimentary model is proposed.The sandstone reservoirs of bar microfacies are high in hydrocarbon fullness,due to its low shale content and high porosity.In contrast,the sandstone reservoirs of beach microfacies show great variance in hydrocarbon fullness as argillaceous laminations are well developed,heterogeneity is week,and hydrocarbons mainly fill in the fine sandstone lithofacies with parallel bedding and argillaceous laminates+burrow fine sandstone lithofacies.

Key words: shallow lacustrine, beach-bar, sedimentary microfacies, sedimentary model, Funing Formation, Zhangjiaduo oilfield, Subei Basin

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