Tracking Fracture Corridors in Tight Gas Reservoirs - An Algerian Case Study

Abstract

The interpretation of faulted systems is an essential step in E&P business, from a proper understanding of prospects to optimal development well placements. The identification of fractured zones within a reservoir, usually characterised by sub-seismic faults, is often neglected, while it can add significant value to the development of a project. The present case study is focused on the very prolific Algerian Ordovician tight reservoir target. It highlights a structure at the end of an appraisal well campaign, where an integrated fracture reservoir study had been performed in order to track efficiently subtle fault corridors. The utilization of advanced seismic attributes using the Multifocusing technique has proven valuable when determining the detection and extension of fracture corridors within the reservoir. At the well locations, results matched reasonably well with the fracture orientation and density interpreted from cores, borehole images and DST interpretations. This approach has a great value when planning well trajectories, for production predictions, and eventually for locating any future development wells in the area.