Seismic method of performing the time picking step

Details Seismic method of performing the time picking step Seismic method of performing the time picking step

2005-03-15

2005-03-15

Moskowitz, Nelson (Department: 3663)

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

C367S028000, C367S030000, C367S059000, C702S014000, C702S017000, C181S103000, C175S040000, C175S041000, C175S050000

Reexamination Certificate

active

06868038

ABSTRACT:
The present invention provides a method of performing the time picking step in a VSP (vertical seismic profile) survey. In a preferred embodiment of the invention the time picking step is carried out on a combined three-component amplitude of the received seismic energy, which contains the amplitude of all the seismic energy received at the receiver. The amplitude of the direct pulse in the combined trace will not decrease to zero as the offset of the source is changed, as can be the case for the single-component amplitude of the direct pulse. In a particularly preferred embodiment of the invention, the combined three-component amplitude is calculated by summing the Hilbert instantaneous amplitudes of the x-, y- and components of the seismic data using the equation (I). The present invention also provides two new time picks. One time pick involves finding the maximum positive gradient of A(t). The other time pick entails extrapolating to A(t)=0 from the time at which A(t) has its greatest positive gradient, using the maximum positive gradient for the extrapolation.

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