Cgg Services Sas

Compagnie Generale De Geophysique

Nicolas Bousquie

Julie Svay

Risto Siliqi

Thomas Mensch

Philippe Herrmann

Anna Sedova

Methods and systems for similarity indicator calculation associated with seismic data acquisition are described. A similarity indicator value can, for example, be based on a normalized partitioned intensity uniformity (PIU) metric. In another aspect, shot imprints are compared by mapping a base (reference) shot imprint onto a current sample of a shot imprint before calculating the similarity indicator value. The similarity indicator value is associated with the shot imprint location used in the calculation and allows re-shooting of only the areas where an insufficient quality of shot data is detected based on a preconfigured threshold value for the similarity indicator.

Repeatability indicator based on shot illumination for seismic acquisition

Methods and systems for target oriented 4D binning of seismic data are presented. A target depth horizon is selected in the vicinity of where 4D changes are expected. Respectively for each data vintage, relationships between the seismic traces and reflection bins, associated with the depth surface, are established and the seismic traces are divided into common reflection angle subsets. The best matching traces from both vintages are selected for each reflection bin and output for further processing.

Target-oriented 4D binning in common reflection point

The invention relates to an estimate of the seismic illumination fold (x, p) in the migrated 3D domain at an image point x, for a dip of vector p characterized in that the illumination fold I (z, p; s, r) is estimated for each (source s, receiver r) pair in the seismic survey, by applying the following steps:&#x2014;determination of the reflection travel time t(&#xb7;x(p);s&#xb7;r) from the source s to the specular reflection point z, on the plane reflector passing through the image point x and perpendicular to the dip vector p, and then return to the reflector r; starting from the diffraction travel time t(&#xb7;z;s&#xb7;r) from the source to the said image point x and then return to the reflector r;&#x2014;incrementing the said illumination fold I (X, p; s, r) related to the said (source s, receiver r) pair as a function of the difference between the diffraction travel time t(x;s,r) and the reflection travel time tr(xr(p)issr).

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Longpont sur Orge, France

Nicolas Bousquie