Cgg Services Sas

Cgg Services Sa

Adel Khalil

Gordon Poole

Henning Hoeber

Roberto Pereira

Yu Zhang

Andrew Ratcliffe

Graham Roberts

Adriano Gomes

Lorenzo Casasanta

Margherita Maraschini

Francesco Perrone

Bernard Deschizeaux

James Sun

Chao Peng

Carlos Alberto Da Costa Filho

Bin Liu

Gregório Goudel Azevedo

Erik Hicks

Jeshurun Hembd

A non-blended dataset related to a same surveyed area as a blended dataset is used to deblend the blended dataset. The non-blended dataset may be used to calculate a model dataset emulating the blended dataset, or may be transformed in a model domain and used to derive sparseness weights, model domain masking, scaling or shaping functions used to deblend the blended dataset.

Method and apparatus for deblending seismic data using a non-blended dataset

Methods and apparatuses for seismic data processing perform a least-squares reverse time migration method in which surface-attribute-independent coefficients for the surface attribute gathers are demigrated to reduce the computational cost.

Prestack least-square reverse time migration on surface attribute gathers compressed using depth-independent coefficients

Seismic exploration of an underground formation uses seismic excitations to probe the formation's properties such as reflectivity that can be imaged using reverse time migration. Using an equal area spherical binning at reflection points improves and simplifies RTM imaging together with adaptability to the data acquisition geometry, while overcoming drawbacks of conventional cylindrical binning.

RTM using equal area spherical binning for generating image angle gathers

A method for spectral analysis of seismic data obtains imaged seismic data and generates orthogonally shifted imaged seismic data gathers. The orthogonally shifted imaged seismic data gathers are processed to generate a spectrally processed imaged seismic data. Alternatively, the imaged seismic data are obtained using a spectral processing filter that is a function of a magnitude of a total wavenumber of the imaged seismic data in three dimensions and a spatially variable velocity function.

Spectral analysis and processing of seismic data using orthogonal image gathers

Multi-vintage energy mapping selects a first seismic survey data and a second seismic survey dataset from a plurality of seismic survey datasets. The first seismic survey dataset includes a set of first energies associated with a first seismic survey geometry, and the second seismic survey dataset includes a set of second energies associated with a second seismic survey geometry. The first set of energies are mapped from the first seismic survey geometry to the second seismic survey geometry, and the second set of energies are mapped from the second seismic survey geometry to the first seismic survey geometry. An updated first seismic dataset and an updated second seismic dataset are generated such that only energies from the first and second seismic datasets associated with changes in a subsurface are preserved in the updated first and second seismic datasets.

Multi-vintage energy mapping

A device, medium and method for deblending seismic data associated with a subsurface of the earth. The method includes a step of receiving seismic data S recorded with one or more seismic receivers, wherein the seismic data S includes shot recordings generated by first and second source arrays that are simultaneously actuated; a step of detecting incoherent energy of the seismic data S using a median filter; a step of replacing incoherent parts of the seismic data with a projection filter to obtain deblended data for one of the two or more source arrays; and a step of generating in a computing device an image of the subsurface based on the deblended data.

Device and method for deblending simultaneous shooting data using an iterative approach

A method and apparatus for noise attenuation. The method includes receiving seismic data associated with at least two vintages (d, d) collected for a same subsurface, wherein the first and second vintages (d, d) are taken at different times; calculating a set of filters (f, fj) that minimizes an energy function (E), wherein the energy function (E) includes a term representing a 4D difference between the first and second vintages (d, d); calculating primaries (p, p) corresponding to the first and second vintages (d, d) based on the set of (f, fj); and calculating a 4D difference (&#x394;) based on the primaries (p, p). The 4D difference (&#x394;) is minimized.

Device and method for optimization of 4D and 3D seismic data

Computing device, computer instructions and method for calculating an image of a subsurface based on least square migration and image de-convolution using a matching operator F. The method includes receiving seismic data d; computing a first image m of the subsurface based on the seismic data d; computing a second image h of the subsurface based on the first image m; applying a transform operation to the first and second images m and h to obtain a first transform of the first image and a second transform of the second image; calculating the matching operator F by matching the first transform of the first image to the second transform of the second image; and generating an updated image mof the subsurface based on the matching operator F and the first transform of the first image.

Seismic data least-square migration method and device

A method for processing seismic data includes receiving seismic data and a velocity model (c(x)) for a plurality of locations (x), scaling a dimension of the seismic data according to the velocity model (c(x)) to provide a velocity normalized seismic data, and generating a final image (S(x)) of the subsurface using the velocity normalized seismic data. The velocity normalized seismic data may be a reverse-time migration image (I(x,&#x3be;)) corresponding to the plurality of locations (x) and a plurality of propagation distance offsets (&#x3be;). The method may also include transforming the reverse-time migration image (I(x,&#x3be;)) for the plurality of selected positions (x) to a wavenumber domain to provide velocity normalized wavenumber data (I(k,&#x3c8;)) and suppressing data components corresponding to non-physical or undefined reflection angles to provide enhanced wavenumber data (I'(k,&#x3c8;)) and using the enhanced wavenumber data (I&#x2032;(k,&#x3c8;)) to generate the final image (S(x)). A corresponding apparatus is also disclosed herein.

Method apparatus and system for migration noise attenuation and image enhancement

Methods and devices for seismic data processing deblend seismic data gathered using simultaneous source acquisition by applying two different deblending techniques. The second deblending technique is applied to residual data obtained after applying the first deblending technique. At least one of these first and second deblending techniques uses a signal-to-noise map.

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Aberdeen, United Kingdom

Adel Khalil