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Three exploration wells drilled in the West of Shetlands targeted crystalline Lewisian Basement as the primary reservoir. The objective of these wells was to demonstrate the presence of movable oil in basement and the viability of fault zones within the Lewisian Basement as an exploration target. Lewisian Basement reservoir properties were defined pre-drill through a combination of fieldwork, offset well data, global basement analogues and detailed 3D seismic interpretation. Dip, azimuth and similarity attributes were analysed within the 3D seismic volume in order to delineate the fault network, complimenting manual fault interpretation. Once the fault network had been defined, two fault zones were chosen as a reservoir target for an inclined basement well, based on their length and location within the reservoir.

After drilling over a kilometre of basement across three wells, significant understanding has been gained of the basement reservoir. The comprehensive suites of log data obtained from the wells have allowed some leading edge techniques to be used to bridge the gap between wellbore data and seismic data, with fault zones identified from log data tying to fault zones that had been interpreted using seismic data. The well results have been used to feed back into the predicted fault model to increase the number of mapped faults and to constrain rock properties including lithology and fracture frequency. This paper summarizes the above process and provides specific details regarding the seismic characterization of the fault network.

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