Integration of Wide Azimuth Seismic with Static and Dynamic Well Data for Fractured Reservoir Characterization

摘要

Open fractures can have a significant influence on porosity and permeability of hydrocarbon reservoirs. In such cases, knowledge about the lateral distribution of fracture parameters such as preferred orientation and density is crucial for deciding drainage strategies. Well data like FMI logs, cores and well tests are commonly used to analyze open fracture properties of the reservoir. Seismic data has a wider spatial coverage than well data and might be used to estimate fracture parameters away from the wells. By analyzing the azimuthal anisotropy in the seismic data, different parameters of the fracture systems (e.g. Fracture density and the dominant direction of fractures) can be estimated. A major challenge is to do build an effective workflow integrating static and dynamic well test data with multi azimuth seismic data. One such workflow is illustrated here using data from the Tiguentourine Field, which is located in the Southern part of the Illizi Basin of Eastern Algeria and operated by a joint venture between Statoil, BP and Sonatrach. The gas condensate production from the Cambrian and Ordovician reservoir units is partly dependent on the existence of natural open fractures.