METHOD FOR SEPARATING INDEPENDENT SIMULTANEOUS SOURCES
First Claim
1. A method of seismic exploration above a region of the subsurface containing structural or stratigraphic features conducive to the presence, migration, or accumulation of hydrocarbons, wherein is provided a blended source seismic survey containing at least two interfering seismic source excitations therein, comprising the steps of:
- (a) within a computer, accessing at least a portion of said blended seismic source survey;
(b) selecting one of said at least two interfering seismic source excitations;
(c) separating said selected source excitation from said at least two interfering seismic source excitations using sparse inversion, thereby producing a single source gather; and
(d) using said single source gather to explore for hydrocarbons within said region of the subsurface.
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Abstract
This is a method of separating simultaneous sources that uses an inversion-type approach. Each source will preferably activated at a random time with respect to the others. These random delays tend to make the interference between sources incoherent while the reflections create coherent events within a series of shots. The shot separation is performed via a numerical inversion process that utilizes the sweeps for each shot, the start times of each shot, and the coherence of reflection events between nearby shots. This method will allow seismic surveys to be acquired faster and cheaper.
94 Citations
13 Claims
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1. A method of seismic exploration above a region of the subsurface containing structural or stratigraphic features conducive to the presence, migration, or accumulation of hydrocarbons, wherein is provided a blended source seismic survey containing at least two interfering seismic source excitations therein, comprising the steps of:
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(a) within a computer, accessing at least a portion of said blended seismic source survey; (b) selecting one of said at least two interfering seismic source excitations; (c) separating said selected source excitation from said at least two interfering seismic source excitations using sparse inversion, thereby producing a single source gather; and (d) using said single source gather to explore for hydrocarbons within said region of the subsurface. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of seismic exploration above a region of the subsurface containing structural or stratigraphic features conducive to the presence, migration, or accumulation of hydrocarbons, wherein is provided a blended source seismic survey containing at least two interfering seismic source excitations from at least one seismic source, comprising the steps of:
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(a) within a computer, accessing at least a portion of said blended seismic source survey; (b) selecting one of said at least one seismic sources; (c) identifying at least one seismic source excitation from said selected seismic source; (d) separating at least one identified seismic source excitation from said at least two interfering seismic source excitations using sparse inversion, thereby producing at least one single source gather; and (e) using said at least one single source gather to explore for hydrocarbons within said region of the subsurface. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification