Modelling Matters undertook a full field static modelling project for Otto Energy in preparation for the field development plan for the Galoc Field Phase 2 development in the North West Palawan Basin, offshore Philippines. This piece of work assisted the successful Final Investment Decision taken in September 2012.
The main objective of the reservoir modelling was the construction of a reference case model in order to estimate the hydrocarbons in place and provide the reservoir engineer a model from which to estimate the incremental reserves and extend the field life with the planning of two additional development horizontal wells. An uncertainty matrix and associated Tornado plot were generated from sensitivity analysis, which highlighted that structural uncertainty had the main impact on volumes in place. Consequently, representative low and high structure case models were generated for simulation by the reservoir engineer.
A second phase of the project included the incorporation of a newly acquired 3D PSDM seismic data set for the update of the structural and stratigraphic model. The complicated lobate depositional setting of the Galoc turbidites were modelled through the inclusion of inversion volumes which allowed the identification of internal reservoir architecture and helped in the construction of robust facies and petrophysical properties. The inversion cube was used as a secondary variable to condition the population of the porosity. The Petrel uncertainty and workflow manager assisted in the generation of P10, P50 and P90 cases in order to refine the development well planning.
