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Natural Gas Geoscience ›› 2011, Vol. 22 ›› Issue (4): 582-587.doi: 10.11764/j.issn.1672-1926.2011.04.582

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Study of Character on Sedimentary Water and Palaeoclimate for Chang7 Oil Layer in Ordos Basin

ZHANG Cai-Li, GAO A-Long, LIU Zhe, HUANG Jing, YANG Ya-Juan, ZHANG Yan   

  1. 1.Research Institute of Exploration and Development,Changqing Oilfield Company,PetroChina,Xi′an 710021,China;
    2.National Engineering Laboratory for Low\|permeability Petroleum Exploration and Development,Xi′an  710021,China;
    3.No.3 Oil Recovery Plant of PetroChina Changqing Oilfield Company,Yinchuan 750006,China;
    4.Department of Exploration,Changqing Oilfield Company,PetroChina,Xi′an  710021,China
  • Received:2011-02-22 Revised:2011-05-12 Online:2011-08-10 Published:2011-08-10

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Abstract:

Based on Sr concentration,the ratios of Sr/Br and Th/U,and biogliph fossil,we discuss the water condition and paleoclimate for the deposition of Chang7 oil layer in the Ordos basin.The results show that the ratio of Sr/Br and Th/U is from 0.19 to 0.65,and 0.36 to 5.03,respectively,indicating the water during the Chang7 Period was continental freshwater.The V/Ni ratio of 1.75-5.53 is fallen into the score of the reducing environment.The element assemblage,biogliph fossil,and Co quantitative match indicate that the water depth at the Chang7 Period was half-deep to deep lake,with the maximum depth of 50, 120m.The paleoclimate was confirmed as warm and humid climate by sporopollen assemblage.

Key words: Paleosalinity, Palaeo-depth;Paleoclimate, Chang-7 oil layer, Ordos basin.

CLC Number: 

  • TE121.3+1

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