Delineation Of Oil And Gas Fields In The Bredasdorp Basin, Offshore South Africa, Using Seismic Attribute Mapping, Seismic Inversion And Avo <br>Techniques

The E-BD oil and the E-CE oil and gas accumulations occur as separate reservoirs<br>consisting of amalgamated deep-marine sandstones. Large areas of these reservoirs<br>are close to or below seismic tuning thickness. A suite of geophysical techniques<br>have been applied to a 3D seismic data volume covering these fields in order to<br>determine their geometries. The techniques employed include seismic amplitude<br>mapping, seismic correlation, seismic inversion and AVO processing. These<br>methods were evaluated and used to assist the interpretation, often complementing<br>each other. In this way, geological models for sandstone distribution have been<br>derived which explain the lack of communication between hydrocarbon-bearing and<br>water-bearing sandstones, and the nature of the reservoir facies encountered in<br>boreholes. This has led to a better assessment of the in-place hydrocarbon volumes<br>and upside potential of these fields.