Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (2): 1-9.doi: 10.3969/j.issn.1673-8926.2017.02.001

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Exploration discovery and prospects of Cretaceous stratigraphic-lithologic reservoirs in Erlian Basin

ZHAO Xianzheng1, WANG Quan2, DAN Weining2, WANG Wenying2, QIAO Xiaoxia2, REN Chunling2   

  1. 1. PetroChina Dagang Oilfield Company, Tianjin 300280, China;
    2. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China
  • Received:2017-01-09 Revised:2017-02-20 Online:2017-03-21 Published:2017-03-21

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Abstract: The Erlian Basin is a group of small Meso-Cenozoic rift basin,which act as an important oil production zone. During its early stage,structural reservoirs were taken as the main objects. With the deepening of exploration, it is more difficult to find them,and the output of oil production declines rapidly. Therefore,it is urgent to search new fields of hydrocarbon exploration for reserve replacement. The hydrocarbon accumulation conditions of the Erlian Basin were understood again. It is characterized by small lake basins,multiple sources,rapid deposition and abrupt change of facies belt,which are favorable for the formation of stratigraphic-lithologic reservoirs. Therefore,a new exploration thought was proposed to change the exploration focus from structural reservoirs to stratigraphic-lithologic reservoirs. Based on exploration practice,the exploration method for the stratigraphic-lithologic reservoirs was developed:“evaluating resource to determine potential,studying structure to figure out the settings,analyzing sedimentation to search for sandbodies,comprehensive research to build the model,rolling evaluation to determine the scale”. By virtue of this method,hydrocarbon exploration is newly broken through in some sags where new oilfield has not been discovered for over 20 years,such as Bayindulan Sag. Meantime,in A'er Sag newly discovered,A'er oilfield with a hundred million reserves was discovered efficiently and quickly by focusing on stratigraphic-lithologic reservoirs according to the successful exploration experience of oil-rich sags. The success of stratigraphic-lithologic reservoirs exploration in the Erlian Basin launches the new hydrocarbon exploration fields in this basin,and can be used as the important reference for the hydrocarbon exploration in similar basins.

CLC Number: 

  • TE121.1
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