Method and apparatus for processing seismic signals from low energy sources
First Claim
1. In a seismic prospecting system, having;
- a. a low energy seismic source;
b. a plurality of geophones at spaced positions distant from said source;
c. means to amplify and digitize the geophone signals;
the method of operation and processing the seismic data comprising;
1. operating said source in C.D.P. format, whereby each source operation is at a different spaced-apart independent position;
2. amplifying and digitizing the geophone signals to 1 bit;
3. C.D.P. stacking said 1 bit digitized signals; and
wherein4. the C.D.P. fold is at least 40.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for carrying out seismic operations with low energy sources, which involves operating the source at spaced points along a seismic spread, the source points are spaced far enough apart so that their seismic waves originate at different points and travel by different paths to the geophones. The geophone outputs cannot be time stacked. The geophone signals are amplified at constant gain and digitized to 1 bit. If the low energy source is a vibratory source, the 1 bit signals are correlated with a 1 bit version of the sweep signal. The resulting correlograms are digitized to 1 bit and then C.D.P. stacked and displayed. If the low energy source is impulsive, the 1 bit amplified signals are C.D.P. stacked and displayed.
14 Citations
19 Claims
-
1. In a seismic prospecting system, having;
-
a. a low energy seismic source; b. a plurality of geophones at spaced positions distant from said source; c. means to amplify and digitize the geophone signals;
the method of operation and processing the seismic data comprising;1. operating said source in C.D.P. format, whereby each source operation is at a different spaced-apart independent position; 2. amplifying and digitizing the geophone signals to 1 bit; 3. C.D.P. stacking said 1 bit digitized signals; and
wherein4. the C.D.P. fold is at least 40. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 18)
-
-
13. In a seismic prospecting system having;
-
a. a vibratory source driven by a reference sweep signal; b. a plurality of geophones at spaced positions distant from said source; c. and means to amplify and digitize the geophone signals;
the method of operation and processing the seismic data, comprising;1. operating said source in C.D.P. format, whereby each source operation is at a different spaced-apart independent position; 2. amplifying and digitizing said received signals to form a 1 bit received signal; 3. digitizing said reference sweep signal; 4. correlating each 1 bit received signal with said digitized reference sweep signal to form multi bit correlograms; 5. digitizing said correlograms to 1 bit; and 6. C.D.P. stacking said 1 bit digitized correlograms; and
wherein7. the C.D.P. fold is at least 40. - View Dependent Claims (14, 15, 16, 17)
-
-
19. In a seismic prospecting system, having;
-
a. a strong seismic source; b. a plurality of geophones at spaced positions distant from said source; c. and means to amplify and digitize the geophone signals;
the method of operation and processing the seismic data comprising;1. operating said source in C.D.P. format, whereby each source operation is at a different spaced-apart independent position; 2. amplifyng and digitizing the geophone signals to 1 bit; 3. C.D.P. stacking said 1 bit digitized signals; and
wherein4. the C.D.P. fold is at least 40, and 5. the number of channels is at least 80.
-
Specification