G - Physics – 01 – V
Patent
G - Physics
01
V
349/14
G01V 1/28 (2006.01)
Patent
CA 1202110
ABSTRACT OF THE DISCLOSURE "METHOD OF SEISMIC COLLECTION UTILIZING MULTICOMPONENT RECEIVERS FOLLOWED BY TIME DOMAIN MIGRATION OF AT LEAST TWO SETS OF RESULTING ELASTIC WAVE FIELDS UTILIZING WAVE TRACKING OF THE FIELDS FOLLOWED BY COMPOSITE IMAGING" By using wave tracking rather than a downward continuation concept, two sets of elastic wave fields (one generated by a seismic source, the other recorded by mul- ticomponent geophones) are migrated separately and are then imaged. The process is repeated for common shot gathers, and then the images (associated with each common midpoint gathers), are stacked. As a consequence of wave tracking, migration operations are preferably performed in the time domain using finite difference discretization equations involving vector properties of the fields but without having to reduce the latter to one-way wave equations. Result: the method of the present invention (i) easily handles reflectors of arbitrary dip angle; (ii) handles interspatial elastic conversions; (iii) eliminates multiples generated by known velo- city contrasts; (iv) takes account of different field source- receiver geometries: (v) provides higher signal-to-noise ratio character- istics since a larger portion of wave energy is migrated than in conventional migration methods of which I am aware; and (vi) has a symbiotic relationship when used with modern vector-based computing systems such as the Cray I, Cray Corporation, Cupertino, California, based on the fact that since the fields themselves are defined by vector properties, operations are surprisingly sped.
446031
Chevron Research And Technology Company
Sim & Mcburney
LandOfFree
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