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Integrating Multi-Disciplinary Data for Building Fit-For-Purpose 3D Mechanical Earth Model

Summary Understanding geomechanics influence early in the field development phase facilitates reservoir management planning. To capture complex geology and associated field development, a 3D Mechanical Earth Model (3D MEM) with Finite Element Method (FEM) approach was selected to analyse the geomechanical related risks associated for two fields in North West Shelf, Australia. The 3D MEMs were constructed using the geological static models, and seismic derived horizons and faults. The 3D properties were propagated based on core calibrated 1D properties and controlled by stratigraphy, 3D facies and seismic inversion volumes. FEM was used to calculate the equilibrium of stresses and strains within the 3D MEMs. The 3D properties and pre-production stresses were validated in blind test wells prior to forward modelling. The 3D MEMs were linked to the dynamic reservoir models to capture the pressure evolution throughout the field lifecycle. The results were used to analyse the risks associated with compaction, subsidence, fault instability, completion integrity and drilling stability of infill wells through depleted reservoirs. The results provided insight in managing the risk early in field development stage. The study’s largest challenge was integrating large volume of data to ensure that the structural complexity and rock heterogeneity are captured and consistent with the geological understanding of the field. A multi-disciplinary team of Earth scientists, reservoir, and geomechanics engineers worked together, and the value of data integration, good communication and teamwork were key success factors. Lessons learned and best practices were captured throughout the study and provided valuable feedback for future works.