Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (2): 210-214.doi: 10.11743/ogg20090212

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Characteristics of hydrocarbon pooling in the east of the Maichen sag of the Beibu Gulf Basin

Su Yongjin1,2, Tang Yuegang1, Shi Shengqun3, Fang Xinna4   

  1. 1. China University of Mining and Technology, Beijing 100083, China;
    2. China Petroleum & Chemical Corporation, Beijing 100728, China;
    3. Research Institute of Geophysical Technologies, Sinopec Jiangsu Oilfield Company, Nanjing, Jiangsu 210046, China;
    4. Sinopec Management Institute, Beijing 100012, China
  • Received:2009-01-03 Online:2009-04-25 Published:2012-01-16

Abstract:

Based on the analysis of regional tectonic evolution,structural unit division and characteristics of strata development,the reservoirs,hydrocarbon pooling conditions and main controlling factors were studied to set up pool-forming models in the east of the Maichen Sag of the Beibu Gulf Basin.The Paleogene Liushagang and Weizhou formations (El and Ew respectively) are the dominant oil-bearing formations which include four sets of reservoir-seal combinations;the dark mudstone in the El2 and the upper El3 are the main source rocks;the El3 and Ew are two important sandstone reservoirs.The traps are mainly faulted nose,faulted block and stratigraphic overlap traps with good timing and spatial configurations.The predominant factors controlling pool-forming could be mature source rocks,reservoirs development,fault features,sealing conditions,configuration of traps and their workable degree.There are three hydrocarbon pooling models,including the inner-slope zone in the deep sag,fault bench in the south,outer-slope and far slope zone.The western part of inner slope zone is the most favorable area for further exploration.

Key words: reservoir, pool-forming characteristics, main controlling factor, Maichen sag, Beibu Gulf Basin

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