Abstract

It is a considerable challenge to effectively develop hetero-geneous fractured reservoirs in complex structural settings. Here we present a case study of a fractured basement reservoir hosted in structural highs formed by fault-controlled blocks in a rift setting. A wide range of data were available to study the current reservoir. The seismic database includes a wide-azimuth data set, as well as an extensive set of derived attributes and structural interpretation. Azimuthal anisotropy, automatic fault detection, and rms amplitude proved to be most useful in the description of the fracture network, the fracture corridors, and a thin, permeable sandstone layer above the basement, respectively. An additional advantage of the wide-azimuth survey was that it provided an optimum illumination in complex structural settings such as the current case. To complete this large-scale data set, conventional log suites and image logs were acquired in most of the wells. Borehole image-log studies were conducted to interpret and recognize fracture features. Regarding dynamic information, flowmeter logs were acquired in addition to the production history. The main objectives of this integrated study were the creation of a conceptual model for well planning and to constrain the static and dynamic properties of the reservoir model.

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