The technical approach to a successful gas appraisal campaign is presented in this paper. In 1990, appraisal of the Angel Field increased the technically proven reserves from 0.6 Tcf to 1.1 Tcf. The campaign was achieved on time and at a cost of A$9 million. A carefully planned program of seismic acquisition and an optimally positioned appraisal well was required to achieve the reserves target. These appraisal activities were optimised by use of a Monte Carlo program specifically written to model geological uncertainties.

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