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Structural and sedimentary basin transformation at the Cambrian/Neoproterozoic interval in Tarim Basin:Implication to subsalt dolostone exploration

Chen Yong-quan,Yan Wei,Han Chang-wei,Yan Lei,Ran Qi-gui,Kang Qian,He Hao,Ma Yuan   

  1. 1.Tarim Oilfield Company,PetroChina,Korla 841000,China; 2.Korla Branch,Research Institute BGP CNPC,Korla 841000,China; 3.PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China
  • Received:2018-07-26 Revised:2018-10-25 Online:2019-01-10

Abstract: As one of the important fields of oil and gas exploration in Tarim Basin,sub-salt dolomite in Cambrian has been restricted by the poor acknowledge of source rocks and reservoirs distribution.Based on the study of the unconformity characteristics of the Cambrian/Neoproterozoic,the seismic interpretation and mapping of the Cryogenian-Sinian and Middle-Lower Cambrian,this paper discussed the sedimentary basin transformation before and after Kalpin movement at the Cambrian/Neoproterozoic interval,in order to solve the problem of hydrocarbon-bearing depression and the dolomite reservoir distribution of the Xiaoerbulake Formation,guiding the optimal exploration zone.Results show that the Kalpin movement has more influence on the southern part of Tarim Basin than the northern part.In the southern part of the western platform,the Lower Cambrian onlaps towards southern paleo-continent.In the northern part of the basin,there is mainly parallel unconformity contact,and the stratigraphic sequence of the Lower-Middle Cambrian is complete.Kalpin movement caused a major paleo-structure transformation from the North-East in Neoproterozoic to the east-west and north/south in Cambrian,and sedimentary transformation from rifted-sedimentary to platform-basin sedimentary.According to the palaeogeography of the Cryogenian-Sinian and Early-Middle Cambrian,the most abundant Neoproterozoic-Cambrian source rocks in the Tarim Basin distribute in the Manxi Depression.The dolomite reservoirs of Xiaoerbulake Formation mainly distributes around the Manxi Depression.It is suggested at last that Central Tarim Uplift,Gucheng area and Lunnan areas should be preferentially prospected.

Key words: Tarim Basin, Kalpin movement, Sedimentary basin transformation, Subsalt dolostone, Exploration zones

CLC Number: 

  • TE121
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