Volume 42 Issue 4
Jul.  2020
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LI Zheng. Comparison of oil-bearing properties and oil mobility of shale with different lithologies in continental basins: a case study of the upper fourth member of Paleogene Shahejie Formation in Dongying Sag, Bohai Bay Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2020, 42(4): 545-551. doi: 10.11781/sysydz202004545
Citation: LI Zheng. Comparison of oil-bearing properties and oil mobility of shale with different lithologies in continental basins: a case study of the upper fourth member of Paleogene Shahejie Formation in Dongying Sag, Bohai Bay Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2020, 42(4): 545-551. doi: 10.11781/sysydz202004545

Comparison of oil-bearing properties and oil mobility of shale with different lithologies in continental basins: a case study of the upper fourth member of Paleogene Shahejie Formation in Dongying Sag, Bohai Bay Basin

doi: 10.11781/sysydz202004545
  • Received Date: 2020-03-22
  • Rev Recd Date: 2020-06-22
  • Publish Date: 2020-07-28
  • The shale in the upper part of the 4th member of Paleogene Shahejie Formation in the Dongying Sag of Bohai Bay Basin can be divided into two lithology types: calcareous mudstone and argillaceous limestone. The differences of organic matter abundance, oil-bearing properties, reservoir properties and movable shale oil in the different lithologies were investigated using X-ray diffraction, microscopic observation, geochemical analysis, porosity tests and mercury injection. The calcareous mudstone has relatively higher organic matter abundance and better oil-bearing properties than the calcareous mudstone. The calcareous mudstone has relatively higher porosity, but the pore throats are generally smaller, while the argillaceous limestone porosity is relatively lower with more large pore throats. The shale oil mobility in the calcareous mudstone and argillaceous limestone was compared using the oil saturation index, mineral adsorption capacity for crude oil and clay mineral transformation degree. The shale oil in the argillaceous limestone has better mobility than the shale oil in the calcareous mudstone.

     

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