Congenital Reservoir Rock Characterization of Weak Hydraulic Properties

Abstract

Abstract Weak hydraulic units occur frequently in many Niger Delta fields. This makes the characterization of reservoirs in such fields quite challenging. In this work the interpretation procedure, adopted model and algorithm were chosen such that each unit is treated separately to make the evaluation process as detailed as possible. Also, a conscious effort was made to incorporate functions in our adopted model that take care of the factors responsible for the weak hydraulic units in the reservoir. The application of cut-offs was done in a manner that blocked properties and predictive algorithm only relate to intervals that will contribute to production. This approach is necessary to improve the precision and predictive algorithm of porosity, permeability and water saturation that form part of the reservoir evaluation process. Usually the inclusion of units with weak hydraulic properties in the evaluation of hydraulic storage at the onset will decrease and weaken the precision of the evaluation process if cut-off were not applied. Also, the approach resulted to a construction of the simplest dynamic model that is compatible with the static model which is the objective of every reservoir characterization. The prime aim of this approach is a more precise reservoir characterization as against a mere approximate.