Schlumberger Technology Corporation

Westerngeco L.l.p.

Xiang Du

Robin Fletcher

Philippe Caprioli

Paul N Childs

Eugene William Starr

A method can include receiving input that specifies a type of partitionable pre-stack seismic data for a geologic environment and corresponding partitions; receiving an elastic model parameterized via elastic properties; generating synthetic seismic data for at least a portion of the geologic environment based at least in part on point spread functions and the elastic model; for the partitions, comparing the pre-stack seismic data and the generated synthetic seismic data; based at least in part on the comparing, updating the elastic model; and outputting values for at least one of the elastic properties.

Amplitude inversion on partitioned depth image gathers using point spread functions

A technique includes determining an image of a subsurface geologic region of interest, where the image represents at least in part ghost energy that is attributable to reflections caused by a reflecting interface. The technique includes deghosting the image, which includes processing data representing the image in a processor-based machine to determine at least one impulse response of a modeling and migration of at least one point scatterer for the region and use the impulse response(s) to attenuate the ghost energy.

Deghosting after imaging

To perform inversion to produce a model of a structure, a filtering operator based at least on an angle between a propagating direction of a source wavefield and a propagating direction of a back-propagated receiver wavefield is computed. The filtering operator is used in performing the inversion to produce the model of the structure.

Inversion using a filtering operator

A technique includes modeling a seismic wavefield in a vertical transversely isotropic media as a second order derivative of a first wavefield function with respect to a vertical direction and not with respect to crossline and inline directions and as second order derivatives of a second wave field function with respect to the inline and crossline directions and not with respect to the vertical direction. The method includes processing seismic measurements of the media in accordance with the modeled seismic wavefield to obtain information about the media. In another technique, a seismic wavefield in a tilted transversely isotropic media are modeled based at least in part on orientation of the symmetry axis and a nonzero shear velocity for the media; and seismic measurements of the media are processed in accordance with the modeled seismic wavefield to obtain information associated with the media.

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Crawley, United Kingdom

Xiang Du