Oil & Gas Geology ›› 2015, Vol. 36 ›› Issue (6): 975-984.doi: 10.11743/ogg20150612

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Depositional characteristics and tectonic control on sedimentation of the 1st Member of Shahejie Formation in Huanghua Depression,Bohai Bay Basin

Zhang Yaxiong1, Dong Yanlei2, Cheng Kenan3, Guo Lei2   

  1. 1. Petroleum Exploration & Production Research Institute, SINOPEC, Beijing, 100083, China;
    2. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    3. Mudlogging International Department, CNPC Greatwall Drilling Company, Beijing 100101, China
  • Received:2015-04-20 Revised:2015-08-20 Online:2015-12-08 Published:2016-01-08

Abstract: Huahua Depression is one of the most important petroliferous depressions in Bohai Bay Basin.Based on core observation,lithology association,sedimentary structure,paleontology and seismic data,this paper studied the depositional characteristics of the 1st Member of Shahejie Formation in Huanghua Depression.We divided the target formation into three 3rd order sequences,namely Es1(1),Es1(2) and Es1(3),and nine system tracts.The results show that five facies including braided river delta,meandering delta,nearshore subaqueous fan,gravity flow and lacustrine facies develop in the 1st Member of Shahejie Formation.We also analyzed the depositional characteristics and the space distribution of each facies.The braided river delta facies distributes in Banqiao sag,Beitang sag and the southwest of Qikou sag.The meande-ring delta facies mainly develops in the south of Huanghua Depression and the southeast of Chengning Uplift.The nearshore subaqueous fan facies develops near the foot of the Cangxian Uplift with steep fault side.The gravity flow facies occurs in the deep lake of the Qibei sag.Tectonic evolution,steepness of fault and palaeomorphology are the main controlling factors on the clastic sedimentary system of the 1st Member of Shahejie Formation.

Key words: clastic sedimentary facies, Shahejie Formation, Huanghua Depression, Bohai Bay Basin

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