Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (4): 13-20.doi: 10.12108/yxyqc.20190402

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Stratigraphic division and sedimentary evolution characteristics of Lower Cambrian in the southern margin of Ordos Basin

WANG Hongbo1, GUO Wei2,3, ZHANG Guisong2,3, JING Xianghui2,3, LI Xiangbo1, WANG Jing1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    3. National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi'an 710018, China
  • Received:2019-03-25 Revised:2019-05-05 Online:2019-07-21 Published:2019-06-21

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Abstract: In order to study the stratigraphic development and sedimentary evolution of Lower Cambrian in the southern margin of Ordos Basin,geotectonic background,stratigraphic correlation and lithofacies palaeogeography were studied. The results show that:(1)Dongpo Formation and Luoquan Formation are the main source rocks developed under Xinji Formation in the southern margin of Ordos Basin,which can be classified into Lower Cambrian. The TOC mass fraction is 0.19%-11.18%,with an average of 3.14%,so they are the best source rocks of Cambrian.(2)The entire North China region transgressed in the early Early Cambrian and deposited a set of transgression strata. The southern margin of Ordos Basin underwent deep-water bay deposition,coastal deposition and carbonate gentle slope deposition.(3)The sedimentary thickness of Cambrian in the southern margin of Ordos Basin is 500-1 300 m,and it can reach more than 1 500 m locally. The oolitic shoals of Zhangxia Formation are widely distributed,with dissolved pores and intergranular pores developed. They are relatively high-quality reservoirs and form a good source-reservoir assemblage with Dongpo Formation and Luoquan Formation. The research results are of great significance to the Cambrian oil and gas exploration in Ordos Basin.

Key words: stratigraphic division, sedimentary evolution, Dongpo Formation, Luoquan Formation, Lower Cambrian, southern margin of Ordos Basin

CLC Number: 

  • TE121.3
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