Full-Field History-Match of Stacked Reservoirs across Fault Blocks to Investigate Cross-Fault Block Communiation

Abstract

A stacked series of fault juxtaposed reservoirs across four fault blocks in an offshore field were being considered for further development, but communication across fault blocks remained an uncertainty even after 40 years of production from these reservoirs. Providing a reliable forecast associated with a development plan required understanding of the impact of these faults to the reservoirs' historical production and how it may impact future development opportunities. A full field simulation model containing all the reservoirs in the field, which can capture the impact of the communication across the fault blocks was built but due to the large number and coarse scale of grid blocks as well as mulyiple reservoirs, it was decided to use the results from the pressure-match work done on the full-field model and work with smaller, but finer scale, full-field simulation models with less number of reservoirs which were more likely to be communicating to produce a model which could answer these questions and provide a reliable forecast associated with the development opportunities.This paper describes a full field, three-dimensional, three-phase, black-oil simulation model of several reservoirs in Bayelsa field (not real name) which was used to investigate across fault block communication and identify further development opportunities in these reservoirs.