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Many prospects that are drilled today are supported by some kind of seismic pore-fluid indicator, i.e.bright spot, dim spot, flat event, AVO anomaly etc. When this technology was first introduced, it was referred to as a direct hydrocarbon indicator (DHI). Subsequent experience with dry holes drilled on prospects with a “DHI” has demonstrated that one of the challenges we face as explorers is to risk correctly these prospects, avoiding any success case bias.
GeoX provides a systematic Bayesian approach to using the seismic indicator information. The method is called DFI (Direct Fluid and matrix Indicator) risk modification. The DFI label signals that the method does not pre-judge the message of the seismic anomalies; risk modification signals that the approach also makes effective use of the traditional bases for geological risking of prospects. A critical element in the method is generating a complete set of possible alternative non-success fluid and pore conditions that might produce the same seismic indicators. The procedure is equally well suited to treating situations where there are no apparent seismic anomalies, but where they are expected.
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