Fracture Characterization and Modeling Various Oil-Recovery Mechanisms for a Highly Fractured Giant Light-Oil Carbonate Reservoir

摘要

Proper fracture characterization and a good understanding of the fracture-matrix system are critical to properly predict oil recovery from naturally fractured reservoirs. In this work, we use an integrated analysis of image logs, production logs, and production history to help constrain matrix and fracture properties. This is done by extracting a sector from the history-matched full field model of a naturally fractured giant light oil carbonate reservoir and explicitly studying matrix fracture flows. Even with constraints provided by the above analysis, there is still significant uncertainty regarding matrix permeability in our reservoir. We built simple mechanistic models to study the impact of this uncertainty on various oil recovery mechanisms such as miscible gas injection and primary depletion. We also quantified the impact of capillarity, diffusion and gravity on recovery mechanisms.