Coal Seam Gas 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’ Reservoir Assessment services cover:

  • Program specification and design
  • Validation of existing reservoir data
  • Laboratory testing
  • Definition of the gas reservoir
  • Exploration program planning
  • Integrating grid-based geological model data from a number of the major geological packages

Gas Reservoir Characterisation

Key benefits of reservoir characterisation are:

  • Clearly targeted studies to satisfy end-user 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. Grid outputs from geological modelling packages, along with geophysical logs provide 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 within the reservoir along with 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, underground in-seam (UIS) boreholes and roadway emission data.

Understanding both the strengths and uncertainties of the reservoir model is a critical part of the characterisation process with the information used to underpin:

  • Strategies employed for mine gas management
  • Coal seam gas reserves and productions assessments
  • Estimating and reporting fugitive emissions from coal seam gas sources

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