Modelling the geomechanics of gas storage: A case study from the Iona gas field, Australia

Constraining Surface Deformation Predictions Resulting from Coal Seam Gas Extraction

“…This 'forward modelling' process provides useful input into the design of baseline monitoring networks. Before showing the results of the surface deformation predictions of the analytical model (SURDEF) in the Surat Basin, we compare the predictions from SURDEF to a 3D geomechanical model (Tenthorey et al, 2011;2013) based on the change in pressure at a gas storage field in Victoria.…”

“…Using data provided by EnergyAustralia, Tenthorey et al (2011;2013) undertook a 3D geomechanical modelling study of the Iona gas storage field. They assessed the reservoir deformation and surface deformation induced by pressure changes throughout the history of the storage field.…”

“…They assessed the reservoir deformation and surface deformation induced by pressure changes throughout the history of the storage field. Given the proprietary nature of data acquired by energy companies, the information provided by EnergyAustralia relating to the pore-pressure change, along with in situ rock property data measured by CO2CRC, make the study of Tenthorey et al (2011;2013) a rare source of comparison for the analytical model used in this report.…”

“…Undrained and drained moduli refer to the rock response for flow (drained) and no flow (undrained) conditions in rock testing while static and dynamic refers to whether the testing of the rock properties are measured using wave velocity (dynamic) or mechanical (static) testing. Table 3.2 Iona gas field properties as described by Goiye (2009) and Tenthorey et al (2013).…”

Statistical based hydromechanical models to estimate poroelastic effects of CO2 injection into a closed reservoir

“…Coupled hydromechanical modeling is typically used for evaluation of the poroelastic effect of injection as well as the resulting geomechanical outcomes such as the potential for fracturing in reservoirs, analysis of slippage along faults, surface uplift, and associated seismicity . Different numerical approaches including finite element method, finite difference method, discrete element method, and boundary element method have been used to address in situ stress changes and rock deformation . Combinations of different methods have also been developed to address the poroelastic response of injection.…”