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- W2266755775 abstract "Summary Significant stress changes are generated when producing reservoirs compact due to large reductions in the reservoir pore-pressure. These stress changes are not confined to the reservoir. The stress and strain is redistributed to the surrounding formations, modifying both velocity and thicknesses in these formations. These changes often manifest themselves as significant timelapse time differences on migrated 4D images. Various authors (Hatchell et al, 2003 and Barkved et al, 2005) have used geomechanical modelling to explain these 4D timeshifts, thereby gaining valuable insight into the behaviour of the whole subsurface around some compacting reservoirs. This has so far been accomplished by assuming a simple relationship between thickness and velocity changes. The modelling is presumably repeated using various updated relationships until a match is obtained with the observed 4D timeshifts. We present an approach in which the 4D time differences are measured on prestack data. Without relying on any assumed relationship between velocity and thickness changes, we use the additional non-zero offset information combined with raytracing and linear least squares inversion techniques to derive the thickness and velocity changes. These resulting velocity and thickness changes combined with density and pore-pressure well data can then be converted to stress and strain changes. The technique should therefore help to close the loop between seismic 4D time differences and geomechanical stress and strain" @default.
- W2266755775 created "2016-06-24" @default.
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- W2266755775 date "2006-01-01" @default.
- W2266755775 modified "2023-09-27" @default.
- W2266755775 title "Estimation of production induced stress changes from 4D finite offset timeshifts" @default.
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- W2266755775 doi "https://doi.org/10.1190/1.2369830" @default.
- W2266755775 hasPublicationYear "2006" @default.
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