Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1991-07-31
1992-07-21
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 48, G01V 130
Patent
active
051329387
ABSTRACT:
A method to adjust a common subsurface feature on seismic traces associated with line misties is provided so that the seismic traces are consistent about the common subsurface feature. The method uses traces which are uniquely located in an x-y coordinate system to reflect the actual location of the traces with respect to an intersection. In this method traces can be associated with a line of seismic data or can be isolated traces such as well-log synthetics or vertical seismic profiles. The traces make up sets of data. An intersection is selected and representative traces from two sets of data are initially selected and form trace pairs. A time gate is determined about a common subsurface features of interest on the representative traces. The time gate isolates a trace gate about the common subsurface feature on each trace leaving only the trace gates in the trace pairs. A time delay is determined for each trace pair. A least squares planar fit of the time delays of the trace pairs is made with respect to the intersection and a phase shift for the intersection is determined. The method is then repeated at additional intersections with other combinations of sets of data. After all of the sets of data and intersections have been processed, the phase shifts and time delays determined for each intersection are harmonized by a least squares fit to determine a single time shift and phase shift for each set of data. The traces from each set of data can then be adjusted by the determined time delay and phase shift for that set of data to make all sets of data consistent at the intersections. Additional embodiments provide methods for amplitude spatial equalization of the trace gates and trace calibration.
REFERENCES:
patent: 4837752 (1989-06-01), Pepchinski
patent: 4893694 (1990-01-01), Houck et al.
"Linearized Simultaneous Inversion for Source Wavelet Equalization and Mis-Tie Adjustment," M. Henry and George R. Mellman, 58th Annual Society of Exploration Geophysics International Meeting (Anaheim, Calif.), Abstracts 1988, pp. 953-955, (ISBN 0-931830-69-9; Paper No. S-11 6; abstract only).
Lobo Ian J.
Reynolds, Jr. Fred S.
Shell Oil Company
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