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PETROMAKS-Maksimal utnyttelse av petroleumsreserver

Stretch-free high-order moveout correction, multiple attenuation and seismic imaging

Tildelt: kr 3,4 mill.

The 1st part of the project is motivated by the wish to better exploit the information recorded in seismic data at large offsets. Generally, data at large offsets suffer from: • Residual moveout. • NMO stretch (usually treated by discarding long offsets). • Coherent noise (e.g. multiples and diffractions). This deteriorates the resolution of stacked sections/images and strongly affects AVO analysis: standard processing techniques do not allow an efficient use of the information available at large offsets . To solve these problems we will use a new type of Radon transform: instead of a hyperbolic or parabolic traveltime equation (hyperbolic and parabolic Radon transforms), the new Radon transform will use a high-order non-hyperbolic equation. Better trav eltime equation means better focusing of energy in the new Radon domain, better separation between primaries and multiples, and hence more efficient multiple attenuation. Choosing an equation with a linear relation between the traveltime and the equatio n parameters, moveout correction can be performed directly in the new Radon domain, by moving energy laterally (cf project description). This operation does not stretch the data. This eliminates a very serious problem that has bothered generations of geop hysicists! In this 1st part of the project we will develop the necessary computer codes and apply them to adequate field data. This will provide high-resolution stacks/images and a much better input for AVO analysis. The 2nd part of the project will be devoted to extending the results and tools developed in the first part to the case of dipping reflectors and media with lateral velocity variations. The long-term objective is to obtain a robust high-resolution imaging tool for seismic exploration. This s econd part will contain more fundamental research. Our goal will be to obtain sufficiently convincing preliminary results for generating an industrial project and start a PhD project for further work.

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PETROMAKS-Maksimal utnyttelse av petroleumsreserver

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