Cgg Services Sas

Sercel Inc.

Thomas Mensch

Risto Siliqi

Damien Grenie

Gordon Poole

Hélène Tonchia

Thomas Elboth

Jean-Pierre Degez

Nicolas Bousquie

Julie Svay

Timothée Moulinier

Thierry Favier

Damien Grenié

Mickael Landais

Chu-Ong Ting

System and method for shooting plural seismic sources Si in a marine acquisition system with a deblending-designed dithering sequence DS. The method includes generating the deblending-designed dithering sequence DSto include random dithering times D, a range of the dithering times Dbeing larger than a preset, non-zero, minimum value pmv; selecting a shooting sequence SS for the plural seismic sources Si; and shooting the plural seismic sources Si with the deblending-designed dithering sequence DS, based on the shooting sequence SS. All odd or all even members of the shooting sequence SS are shot with zero dithering times.

System and method for generating dithering sequences with minimum value for seismic exploration

A method for steering a marine seismic acquisition system by determining a steering point associated with towed seismic equipment is described. Coverage boundaries for a current line in a seismic survey and for an already acquired adjacent line in the seismic survey are computed. Cross-line distances between the coverage boundary for the current line and the coverage boundary for the adjacent line are computed based on a set of specifications for the seismic survey. A steering point associated with towed seismic equipment is determined based on the computed cross-line distances. A least one steering command for a steering element in the marine seismic acquisition system is generated based on the determined steering point.

Steering for coverage in seismic surveys

System, medium and method for de-blending seismic data. The method for acquiring blended seismic data associated with a subsurface of the earth includes receiving coordinates of a sail line associated with first and second shot point locations; towing first and second source arrays in water along the sail line; shooting the first and second source arrays with a constant delay parameter so that a seismic trace recorded by a seismic sensor has at least a first uncontaminated portion that includes seismic energy generated substantially only by one of the first and second source arrays and a second portion that includes seismic energy generated by both the first and second source arrays; and recording blended seismic data generated by the first and second source arrays with the seismic sensor.

Acquisition system and method for blended seismic data

Method and system for acquiring seismic data. The marine seismic acquisition system includes a first vessel that follows an inline direction (X); a first source array (S) configured to generate first seismic waves; and a second source array (S) configured to generate second seismic waves. The first and second source arrays are towed by the first vessel along the inline direction (X) and a first inline distance (d) between (i) a first center of source (CS) of the first source array (S) and (ii) a second center of source (CS) of the second source array (S) is different from zero.

Staggered source array configuration system and method

Method and system for acquiring seismic data. The system includes a first streamer vessel configured to tow a first source array and a first streamer spread; a first source vessel configured to tow a second source array; and a second source vessel configured to tow a third source array. The first to third source arrays are distributed along a non-linear profile while the first streamer vessel and the first to second source vessels move along an inline direction (X).

Multi-vessel seismic acquisition system and method

Systems and methods for acquiring blended and unblended seismic data during a single seismic survey. The blended and unblended seismic data is generated with a plurality of sources that are fired in a dedicated sequence. The sequence involves firing all the sources at a first time, advancing the sources along a given path, firing only a first source at a second time, later than the first time, advancing the sources, firing again all the sources at a third time, later than the second time, advancing the sources, firing only a second source at a fourth time, later than the third time, and so on until a desired subsurface is fully surveyed.

Mixed sequential and simultaneous source acquisition and system

Presented are methods and a system for efficiently acquiring seismic data based on a virtual seismic spread. A streamer vessel and a source vessel are used in combination and in a specific spatial arrangement collect seismic data. The source arrays can be fired simultaneously, creating blended seismic data that is separated with a deblending algorithm or sequentially to collect seismic data directly. The virtual seismic spread can be configured to reduce survey time or decrease capital costs and health safety and environment exposure based on the size of the streamer array towed by the streamer vessel.

Virtual marine seismic spread acquisition

There is a method for acquiring seismic data over a survey area. The method includes deploying streamer and source vessels to acquire seismic data along a survey line; performing one pass with the streamer and source vessels along the survey line for collecting wide azimuth (WAZ) data; and performing another pass with the streamer and source vessels along the survey line for collecting narrow azimuth (NAZ) data.

Combined wide and narrow azimuth seismic data acquisition system and method

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.

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Paris, France

Thomas Mensch