Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Reexamination Certificate
2007-05-22
2009-08-18
Keith, Jack W. (Department: 3663)
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
Reexamination Certificate
active
07577061
ABSTRACT:
Evolution of an hydrocarbon reservoir in the process of producing is carried out by co-analyzing the changes in the propagation times and seismic amplitudes of a seismic wavelet along propagation paths in the ground. A base survey of the reservoir is provided, with a set of seismic traces at a first time T associated to a first velocity field Vb; a monitor survey of the reservoir is provided, the monitor survey being taken at a second time T+ΔT, with a set of seismic traces associated to the same positions as in the base survey; the monitor survey is associated to a second velocity field Vm. For a set of points i in the base survey, one computes over the points of the set the sum S of a norm of the difference betweenthe amplitude biof the seismic trace in the base survey at each point i andthe sum of the amplitude mi′of the seismic trace at a time-corresponding point i′ in the monitor survey and the amplitude due to the reflectivity change local to the time-corresponding point i′ induced by the difference between the first velocity field Vband the second velocity field Vm;the time-corresponding point i′ being shifted in time by a time-shift derived from the velocity changes along the propagation path from the surface to time-corresponding point i′. This sum is minimized to characterize the evolution of the hydrocarbon reservoir and derive the velocity changes from the base survey to the monitor survey.
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Cherrett Adam John
Sexton Paul
Williamson Paul
Hirsch Simpson LLC
Keith Jack W.
Saito Krystine
Total S.A.
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