Oil & Gas Geology ›› 2005, Vol. 26 ›› Issue (3): 323-328.doi: 10.11743/ogg20050310

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Buried hill reservoirs in Bamianhe area of Dongying depression,Bohai Bay basin

Yu Hongfeng1,2, Wang Yingmin1,2, Li Xue3   

  1. 1. Key Laboratory for Petroleum Accumulation, Ministry of Education, Beijing;
    2. Basin & Reservoir Research Center, China University of Petroleum, Beijing;
    3. Qinghe Oil Recovery Plant, Shengli Oilfield Co.Ltd, SINOPEC, Dongying, Shandong
  • Received:2005-05-08 Online:2005-06-25 Published:2012-01-16

Abstract:

Cambrian and Ordovician carbonates in Bamianhe area on the southern slope of Dongying depression in Bohai Bay basin have experienced leaching and denudation during the long period of outcropping,resulting in well developed dissolution rugs.Moreover,fractures resulting from tectonic activities communicate with the dissolution vugs lead to the formation of good weathered-crust reservoirs.The brown oil shales and dark-colored mudstones in the 4th and 3rd members of Shahejie Fm in Niuzhuang and Boxing sags have large hydrocarbon-generating potentials,thus they are the major source rocks.The grey and dark-grey mudstones in the 2nd member of Kongdian Fm have relatively good hydrocarbon-generating capacity,thus they are also relatively good source rocks.The hydrocarbons generated from these source rocks might have migrated through the pathways,composed of faults in the southern slope zone,the unconformities between Neogene and Paleogene and between Paleogene and Mesozoic,as well as the sandbodies or cartier beds in Paleogene Kongdian and Shahejie Formations,and upward along the slope.When they migrated into the Cambrian-Ordovician carbonate weathered-crust reservoirs in Bamianhe area,they might have accumulated and become pools,due to the sealing of mudstones in Guantao Fm,the 4th member of Shahejie Fm and Kongdian Fm.

Key words: buried hill, hydrocarbon migration, reservoiring of hydrocarbon, Bamianhe area, Dongying depression, Bohai Bay basin

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