Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (2): 86-94.doi: 10.12108/yxyqc.20220208

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and geological significance of stromatolite dolomite of Ma 55 submember of Ordovician Majiagou Formation in Mizhi area, central-eastern Ordos Basin

LUO Zhenfeng1, SU Zhongtang1,2, LIAO Huihong1, HUANG Wenming3, MA Hui1, SHE Wei1   

  1. 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610059, China;
    3. Sulige Project Management Department, Chuanqing Drilling Engineering Co., Ltd., CNPC, Chengdu 610051, China
  • Received:2021-05-24 Revised:2021-09-17 Online:2022-03-01 Published:2022-03-14

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Abstract: A set of stromatolite dolomite developed at the bottom of Ma55 submember of Majiagou Formation in Mizhi area, central-eastern Ordos Basin, which is a good material for studying microbial rocks and microbial dolomitization. The stromatolite dolomite was studied through the analysis of petrology, mineralogy, cathodoluminescence, scanning electron microscope, carbon, oxygen and strontium isotopes, geochemistry, the sedimentary environment of Ma 55 submember was determined, and the genesis and geological significance of this set of stromatolite dolomite were discussed. The research results show that:(1) The stromatolites in the study area can be divided into columnar and dendritic according to the morphological characteristics, the dolomite crystal is microcrystalline, and it is dark red in the cathodoluminescence, and the dolomite is granular under the scanning electron microscope.(2) The δ13C value of stromatolite dolomite(-4.15‰--0.80‰) is generally within the range of seawater value in the same period, and the δ18O value(-13.19‰--6.62‰) is obviously negative compared with the seawater value in the same period. The 87Sr/86Sr value(0.708 9-0.709 8) is higher than that of seawater in the same period. The contents of Fe, Mn, Na of the stromatolite dolomite are relatively high, and the Sr content is relatively low. The dolomitization fluid of the stromatolite dolomite of Ma 55 submember in the study area is mainly marine-derived fluid, mixed with atmospheric fresh water, which is the product of shallow buried infiltration and reflux in the intertidal-subtidal zone.(3) The intertidal zone with seawater salinity conversion in the early stage of transgression is a favorable area for oil and gas exploration of stromatolite dolomite.

Key words: stromatolite dolomite, seepage reflux dolomitization, tidal flat, Ma 55 submember, Ordovician, Mizhi area, Ordos Basin

CLC Number: 

  • TE122.2
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