P-T-X Reconstruction

Confocal

  • In the case of oil inclusions, Confocal Scanning Laser Microscopy is used to determine the Gas Oil Ratio (GOR) of individual fluorescent inclusions; GOR varies with temperature and is characteristic of oil chemistry. It serves as an input parameter for thermodynamic modelling.
  • GOR vs Th graphs are used to determine hydrocarbon types: black oils, heavy oils, light oils, critical oils, gas condensates, wet gas, and dry gas.
Observation and 3D modeling of an oil inclusion
Observation and 3D modeling of an oil inclusion
Observation with confocal microscope
Observation with confocal microscope

Modelling

  • Thermodynamic modelling of aqueous inclusions is based on the Duan equation of state (H2O-NaCl-CH4 system).
  • Thermodynamic modelling of oil inclusions is based on the Peng-Robinson equation of state (PIT software).
  • The superimposition of the oil and aqueous isochores gives the trapping temperature and pressure at the intersect.
Intersection of isochores of an aqueous and hydrocarbon inclusion
Intersection of isochores of an aqueous and hydrocarbon inclusion