Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (6): 914-922,943.doi: 10.11743/ogg20120613

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Sedimentary characteristics and evolution of the Banqiao reservoir in Banqiao oilfield,Huanghua Depression

Song Fan1, Su Nina1, Hou Jiagen2, Yang Shaochun1, Zhu Chunyan1, Zhang Ruixiang1   

  1. 1. School of Geosciences, China University of Petroleum, Qingdao, Shandong 266580, China;
    2. College of Geosciences, China University of Petroleum, Beijing 102249, China
  • Received:2011-10-15 Revised:2012-11-30 Online:2012-12-28 Published:2013-01-10

Abstract:

The sedimentation of the Banqiao reservoir in the Banqiao oilfield occurred during the most active tectonism of the Huanghua Depression in the Bohai Bay Basin.The basin expanded so quickly that the accommodation space it provided was far more spacious for sedimentation.The typical deep-water gravity flow deposits were formed in the northern and central parts of the oilfield,while the shallow-water beach-bar deposits were formed in the southern part under the control of palaeo-geomorphology.Eight sedimentary micro-facies were identified in the study area through core observation and study of facies markers and logging facies.The gravity flow channel facies can be divided into 4 microfacies including main channel,distributary channel,channel flank and overflow.The beach-bar facies also can be divided into 4 microfacies,including main bar,bar flank,inner-margin beach and outer-margin beach.The sedimentary scale shrunk vertically due to many factors such as lake basin expansion,sediment input,palaeo-geomorphology and palaeo-climate.At the end of deposition,the gravity flow channel deposits were only developed in the northern part and the winding and forking phenomenon can be easily observed,while the beach-bar disappeared.The fine study of the sedimentary characteristics and evolutions in the area lays a sound foundation for adjustment of development well pattern.

Key words: beach bar, gravity flow, sedimentary characteristics, sedimentary facies evolution, Banqiao oilfield, Huanghua Depression, Bohai Bay Basin

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