Method and system for applying dispersive normal moveout correct

Details Method and system for applying dispersive normal moveout correct Method and system for applying dispersive normal moveout correct

1996-11-12

1999-08-03

McElheny, Jr., Donald E.

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

367 48, 367 52, 702 13, G06F 1900

Patent

active

059337893

ABSTRACT:
A method and computer system for deriving and applying normal moveout phase and time shift corrections to seismic survey traces is disclosed. Normal moveout time-shift corrections are first applied to traces in a common midpoint (CMP) or common depth point (CDP) gather, based upon stacking velocity analysis applied to envelopes of the traces. One offset in the survey, preferably the maximum offset, is selected as the reference point; the NMO time shift at this reference offset is then selected as a reference NMO time-shift. The traces in the gather are each phase-shifted based upon iterated reference phase dispersion values at the reference offset, times the ratio of the normal moveout time-shifts for the trace in the gather to that of the reference offset (raised to a power). Semblance analysis is performed to identify, for each point in normal incidence time and thus for each reflective event, the optimum reference phase dispersion value. Phase corrections, based upon the optimum reference phase dispersion value as a function of normal incidence time multiplied by the ratio of the normal moveout trace and reference time shifts, are then applied to the traces in the gather. Interpolation may be used to define the optimum reference phase dispersion for CMP gathers lying between the midpoints of analyzed gathers.

REFERENCES:
patent: 5684754 (1997-11-01), Byun et al.
Dix, "Seismic Velocities from Surface Measurements", Geophysics, vol. XX, No. 1 (1955), pp. 68,86.
Taner and Koehler, "Velocity Spectra--Digital Computer Derivation and Applications of Velocity Functions", Geophysics, vol. 34, No. 6 (1969), pp. 859,881.
Shapiro, et al., "Frequency-Dependent Anisotropy of Scalar Waves in a Multilayered Medium", J. Seismic Exploration, vol. 3 (1994), pp. 37-52.

Affiliated with

Also associated with

Rating

Method and system for applying dispersive normal moveout correct does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and system for applying dispersive normal moveout correct, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for applying dispersive normal moveout correct will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-860058