How to Integrate Wireline Formation Tester, Logs, Core and Well Test Data to Get Hydraulic Flow Unit Permeability’s: Application to Algeria Gas Field

Abstract

Reservoirs in Algeria typically contain multiple rock types from different facies depositional systems, and their identification and their evaluation in some areas, is becoming more challenging. It's not easy to get a unique permeability value for specific flow-unit without combining different formation evaluation disciplines. Logs, cores and Well tests data, provide information not only of different kinds of permeability but also at different scale measurements.The presented methodology is a case study of an integrated work performed during an exploration and appraisal stage in a gas field in Algeria.The integration technique steps consisted of: • Identifying facies and hydraulic units from core data analysis • Computing permeability curve in the entire reservoir including the non-cored zones by combining logs and porosity/permeability relationship of each hydraulic flow unit. • Analyzing well testing transient pressures and estimating flow capacity.• Computing permeability at the identified flow-unit scale by the analysis of wireline formation tester data using its inflatable straddle packer configuration.The synthetic permeability curve showed a good correlation between core data and predicted values. A thickness that is actively contributing to the flow has been identified. Permeability values at the flow-unit scale were then computed.The obtained results from the integrated technique provide accurate dynamic characteristics in a gas-bearing formation and constrain the producibility knowledge of a reservoir.