CSG Reservoir Assessment

With GeoGAS’ laboratory methods, data validation and leveraging techniques we believe we can define any coal seam gas reservoir for the least cost and highest certainty (lowest risk).

GeoGAS’ CSG Reservoir Assessment services cover:

  • Program specification and design
  • Field support (through our alliance partner Geological Solutions Pty. Ltd.)
  • Laboratory testing
  • Definition of the gas reservoir.

These activities provide the basis for downstream studies on:

  • Mine gas management
  • Coal seam gas reserves and productions assessment
  • Greenhouse gas emission reporting..

Our work is supported by the use of geological modelling packages (MINEX, MINESCAPE)

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Gas Reservoir Characterisation

Key benefits of reservoir characterisation are:

  • Clearly targeted studies to satisfy end use demands.
  • Quantification of parameter uncertainty as inputs to downstream probability modelling.
  • Leveraging gas reservoir parameters through gas domain modelling of gas content and permeability.

Gas reservoir characterisation specifically includes:

  • Geometry and properties of coal seams and interburden materials. It utilises geological modelling packages and geophysical logs which provides the basic properties of seam geometry, coal rank, type, grade, depth and structure.
  • Gas content, composition and desorption rate indices.
  • Gas sorption isotherms, which together with gas content, pore pressure and reservoir temperature are used to calculate gas saturation and critical desorption pressure.
  • Permeability assessment using third party well test results or results of GeoGAS history match modelling from surface to in-seam (SIS) wells and underground in-seam (UIS) boreholes.

Supporting more specific studies are our petrographic laboratory’s coal maceral and vitrinite reflectance analyses.

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