oa Unconventional Gas and HP-HT Reservoirs : Overview of Main Challenges and Use of 4D Seismic and Geomechanics as a Monitoring and Risk Mitigation Tool

etion. The presentation will focus on two main topics : • An integrated workflow that combines results from 4D seismic inversion, geomechanics modelling and reservoir simulations in a shared earth model • Application to the Elgin and Franklin HP/HT fields located in the UK Central Graben of the North Sea : o Interval time-shifts using an in-house warping method o A coupled faulted reservoir and geomechanical models to determine both the stress redistribution within and around the reservoir including associated reactivated fault slips, and to derive synthetic 4D time-shifts with the help of a rock physics model o Closing the loop by achieving reasonable match between the observed and the synthetic 4D time-shifts. This integrated study proved to be a useful tool for progressing understanding of the reservoir and production behaviour of the Elgin and Franklin Fields, with the ultimate goal being identification of new drilling targets, mitigation of casing integrity risks, safe infill drilling.