Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (5): 37-48.doi: 10.12108/yxyqc.20230504

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary characteristics of Ma 55 sub-member of Ordovician Majiagou Formation in Sulige area,Ordos Basin

DU Jiangmin1,2, CUI Zihao1,2, JIA Zhiwei3, ZHANG Yi3, NIE Wancai4,5, LONG Pengyu1,2, LIU Boyuan1,2   

  1. 1. Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang 050031, China;
    2. College of Earth Sciences, Hebei GEO University, Shijiazhuang 050031, China;
    3. PetroChina Southwest Oil & Gas Field Company, Chengdu 610051, China;
    4. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    5. Department of Natural Gas Evaluation Project, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2022-09-23 Revised:2022-11-27 Online:2023-09-01 Published:2023-09-28

Abstract: The exploration potential of Ma 55 sub-member of Ordovician Majiagou Formation in Sulige area of Ordos Basin is huge. Through core observation,thin section identification,scanning electron microscope and geochemical testing,combined with geophysical technologies,the sedimentary characteristics of Ma 55 sub-member of Ordovician Majiagou Formation in Sulige area were studied,and its petroleum geological significance was discussed. The results show that: (1)The Ma 55 sub-member of Ordovician Majiagou Formation in Sulige area belongs to carbonate platform facies which inclines to the east under the background of overall transgression and late regressions. Open platform and restricted platform subfacies are developed,which can be subdivided into dolomite flat,carbonate flat,and intraplatform shoal,dolomite-carbonate flat and carbonate-dolomite flat according to the composition.(2)In the plane,the sedimentary environment is typical banded distribution,the salinity of the sedimentary water in the western region is relatively high,with restricted platform characteristics,while the salinity of the sedimentary water in the eastern region is low and has the characteristics of open platform.(3)The low-lying areas within the restricted platform and the open platform in the study area,where high-density and Mg-rich seawater converges,are favorable areas for dolomite development.(4)The restricted/open dolomite flat,intraplatform shoal and gypsum-bearing dolomite flat microfacies mainly develop various kinds of dolomite reservoirs. The western and northern areas with contiguous dolomites are potential replacement areas for oil and gas exploration.

Key words: open platform, restricted platform, dolomite reservoir, Ma55 sub-member, Majiagou Formation, Ordovician, Sulige area, Ordos Basin

CLC Number: 

  • TE121.3
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