The Potential Implications of Stress-Induced Anisotropy for 4D Seismic

F046 THE POTENTIAL IMPLICATIONS OF STRESS- INDUCED ANISOTROPY FOR 4D SEISMIC Summary 1 HOUSHANG MANSOURI AND COLIN MACBETH Heriot-Watt Institute of Petroleum Engineering Edinburgh UK It is predicted that stress-induced anisotropy is likely to have a moderate to large impact on the interpretation of 4D seismic signatures. The effect is most obvious when base and repeat surveys are shot along different azimuths but can also be important in surveys shot along similar azimuths. The stress-induced anisotropy effects equate to a very large error in estimating pressure from the top reservoir event in the Paleocene sands of the Nelson field and