Multiple stacking and spatial mapping of seismic data

Details Multiple stacking and spatial mapping of seismic data Multiple stacking and spatial mapping of seismic data

1987-01-28

1988-04-05

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 56, 367 53, 364421, G01V 120, G01V 136

Patent

active

047363479

ABSTRACT:
Seismic traces are stacked in a plurality of orthogonal measures to form multiple stacked traces at a positive offset. The stacking process determines the apparent velocities as functions of the travel time at the positive offset. The interval acoustic velocity of the first layer is then determined from knowledge of surface topography, source-receiver offset, two-way travel times and the first reflector apparent velocities. The first layer velocity information enables the incident and emergent angles of the raypaths at the surface to be calculated, as well as enabling the dip angles and spatial coordinates of the reflection points on the first reflecting boundary to be determined.
Seismic data corresponding to the second reflecting boundary are then spatially mapped to the first reflecting boundary by ray tracing and by a new method for calculating the apparent velocities at the first boundary. The process is repeated for each succeedingly deeper boundary. The derived acoustic velocity model of the earth is displayed as a stacked seismic section in spatial coordinates. This process may be applied to obtain earth models and seismic sections in both two and three dimensions.

REFERENCES:
Gjoystdal et al, "Inversion of Reflection Times in Three Dimensions", Geophysics, vol. 46, #7, pp. 972-983, 7/81.
Gray et al, "Velocity Determination in a Complex Earth", 1983, SEG Convention, Las Vegas, Nev., pp. 1-17, plus figures.

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