Oil & Gas Geology ›› 2004, Vol. 25 ›› Issue (5): 528-532.doi: 10.11743/ogg20040510

Previous Articles     Next Articles

Reservoir characteristics and genesis of turbidite fans in the 3rd member of Shahejie Formation in central Dongying depression

Wang Jufeng1,2, Zheng Herong3, Su Faqing2   

  1. 1. China University of Geosciences, Beijing;
    2. Geological Science Research Institute of Shengli Oilfield Company Ltd., SINOPEC, Dongying, Shandong;
    3. Exploration and Development Research Institute, SINOPEC, Beijing
  • Received:2004-08-24 Online:2004-10-25 Published:2012-01-16

Abstract:

Turbidite fans in the 3rd member of Shahejie Formation in central Dongying depression,mainly distributed in the deepest sag of the depression,can be divided genetically into three types:slump turbidite fan,slope-sliding turbidite fan and sublacustrine fan.Their formation was closely related to the fluctuation of base level.Slump turbidite fans were formed during the short-term falling of base level,as a result of redeposition of the slumped frontal sediments of the prograding delta.Slope-sliding turbidite fans were formed during the short-term rising of base level,as a result of redeposition of sediments sliding from marginal slope of the lake basin to deep lake area,due to erosion and washing of delta front and plain by dynamic force of lake-and flood-water.Sublacustrine fans were formed during the medium-term rising of base level and located in the sequence stratigraphy corresponding to the lowstand fans in the lowstand system tract in classical sequence stratigraphy.Of these three types of turbidite fans,the sublacustrine fans and slope-sliding fans,with large thickness,good poroperm characteristics and petroliferous properties,are the main reservoirs in this area,while slump turbidite fans are characterized by smaller sizes and relatively poor poroperm characteristics.

Key words: base level cycle, turbidite fans, genesis of reservoir, the 3rd member of Shahejie Formation, Dongying depression

CLC Number: