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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2017  >  39(1): 24-31
Xu Bo, Wang Baoqing, Sun Liuyi, Wang Hongwei, Liu Baoxian, Jing Xianghui, Liu Liping. Middle Cambrian oolitic carbonate rocks in the central ancient upwelling area, the Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(1): 24-31. doi: 10.11781/sysydz201701024
Citation: Xu Bo, Wang Baoqing, Sun Liuyi, Wang Hongwei, Liu Baoxian, Jing Xianghui, Liu Liping. Middle Cambrian oolitic carbonate rocks in the central ancient upwelling area, the Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(1): 24-31. doi: 10.11781/sysydz201701024
shu

Middle Cambrian oolitic carbonate rocks in the central ancient upwelling area, the Ordos Basin

doi: 10.11781/sysydz201701024
  • 1.

    Xi'an Shiyou University, Xi'an, Shaanxi 710065, China

  • 2. PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China

  • 3. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an, Shaanxi 710018, China

  • Received Date: 2015-08-26
  • Rev Recd Date: 2016-11-30
  • Publish Date: 2017-01-28
    Abstract
  • Middle Cambrian oolitic carbonate rocks were deposited in small shoals of the ramp in a central ancient upwelling area in the Ordos Basin. The oolitic carbonate rocks mainly consist of calcites and dolomites. The δ18O and δ13C values range from -11.3‰ to -4.9‰ and from -1.7‰ to 0.3‰, averaging -6.5‰ and -0.8‰ V-PDB, respectively. Since they were deposited in oolitic shoals under meteoric leaching and experienced deep burial diagenesis, the δ18O values of the oolitic carbonate rocks are obviously low. During diagenesis, the influence of organic materials was slight, leading to normal δ13C values for the oolitic carbonate rocks. The δ18O values of dolomites are higher than those of limestones. The results of analyses by laser-microsampling indicate that the δ18O and δ13C values of ooids are lower than those of the cements because the ooids formed in turbulent environments, and were leached by meteoric water after their formation. The cements precipitated in pore water with marine characteristics and high salinity, and were slightly influenced by meteoric water after their formation. The oolotic carbonate rocks are characterized with low Na and Sr, very high Fe, and medium Mn contents because of deep burial diagenesis. Most dolomites with low order degrees and high MgCO3 contents generally formed through replacement in brine during the burial stage. Deep burial diagenesis and good development of cements resulted in the development of extremely low porosity in the oolitic carbonate rocks.

     

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