Controlling Lithologic Reservoirs Study bout Paleogene-Neogene Slope-break Belts in Southwestern Qaidam Basin

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  • 1.Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China; 2.College of Geosciences, China University of Petroleum, Beijing 102249, China; 3.Yangtze University College of Technology and Engineering,Jingzhou 434023,China

Received date: 2013-03-18

  Revised date: 2013-11-20

  Online published: 2014-04-10

Abstract

Systerm researches about types,distribution and evolution of Paleogene-Neogene slope-break belts in Southwestern Qaidam Basin have been finished to find that the short cycle sedimentary slope-break belt,propering to plateau salty lake,and the fracture slope break belt are developed.The former exists in almost formations except N1, and has a NS distribution.This kind of slope-break belts control the LST,and are the mutational boundaries of distributary channels(underwater distributary channels) between underwater distributary channels(beaches and bars or slump turbidite fans).Kunbei,Alaer,Qigequan,Hongliuquan and Alaerdong,Ⅷ Faults ,which are regulatory,have the characteristics of continuous developing.Ⅺ fault belongs to the discontinuous belt because it is relatively inactive.Inverse fault slope-break belts,which are south-dipping have a more accommodation below the belts.Nevertheless,following fault slope-break belts,north-dipping,have two increscent accommodations.The first is the small reverse fault trough over belts and the second is below belts,which are the profitable zones for sandbodies.Seven lithologic reservoirs having already been found have been analysised to suggested that they are all below the slope-break belts,which have controled the developments of lithologic traps and structure-lithologic traps.On the other hand,those two kinds of belts can make up fracture-sandbody conducting system,which has dominated the hydrocarbon migration paths.So in a word,slope-break belts have the dual functions of controling sand and accumulating oil and gas.The next key drection of lithologic reservoirs is to explore the zones nearby the slope-break belts.

Cite this article

SHI Hui,LI Hui,LIU Zhen . Controlling Lithologic Reservoirs Study bout Paleogene-Neogene Slope-break Belts in Southwestern Qaidam Basin[J]. Natural Gas Geoscience, 2014 , 25(4) : 516 -525 . DOI: 10.11764/j.issn.1672-1926.2014.04.516

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