Simultaneous performance of multiple seismic vibratory surveys
First Claim
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1. A method of conducting n seismic surveys simultaneously at substantially the same location where n is a whole number greater than two comprising:
- simultaneously transmitting n times with n vibratory sources, n signals;
detecting the n signals resulting from the n simultaneous transmissions of the n signals;
varying the initial phases of said transmitted signals among n initial phases to enable the signal transmitted by each of the n vibratory sources to be separated from the n detected signals by data processing.
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Abstract
The invention is a method of performing a plurality of vibratory seismic surveys simultaneously. A plurality of vibratory sources transmit signals into the earth. Each vibratory source successively transmits the same signal, except that an offset phase of the signal is selectively shifted for successive transmissions. The offset phase of the signal transmitted by each vibratory source is selected to enable the signal from each of the vibratory sources to be recovered by data processing.
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Citations
16 Claims
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1. A method of conducting n seismic surveys simultaneously at substantially the same location where n is a whole number greater than two comprising:
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simultaneously transmitting n times with n vibratory sources, n signals; detecting the n signals resulting from the n simultaneous transmissions of the n signals; varying the initial phases of said transmitted signals among n initial phases to enable the signal transmitted by each of the n vibratory sources to be separated from the n detected signals by data processing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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11. The method of claim 8 wherein n=3 and the initial phase angles are 0°
- , 120°
, and 240° and
the initial phases of the signals transmitted by each vibratory source during each transmission are;
space="preserve" listing-type="tabular">______________________________________ Sweep 1 Sweep 2 Sweep 3 ______________________________________ Vibrator 1 0°
0°
0°
Vibrator 2 0°
120°
240°
Vibrator 3 0°
240°
120°
______________________________________
- , 120°
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12. The method of claim 8 wherein n=4 and the initial phase angles are 0°
- , 90°
, 180° and
270 and the initial phases of the signals transmitted by each vibratory source during each transmission are;
space="preserve" listing-type="tabular">______________________________________ Sweep 1 Sweep 2 Sweep 3 Sweep 4 ______________________________________ Vibrator 1 0°
0°
0°
0°
Vibrator 2 0°
90°
180°
270°
Vibrator 3 0°
180°
0°
180°
Vibrator 4 0°
270°
180°
90°
______________________________________
- , 90°
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13. The method of claim 8 wherein n=5 and the selected phase angles iare 0°
- , 72°
, 144°
, 216° and
288° and
the initial phases of the signals transmitted by each vibratory source during each sweep are;
space="preserve" listing-type="tabular">______________________________________ Sweep 1 Sweep 2 Sweep 3 Sweep 4 Sweep 5 ______________________________________ Vibrator 1 0°
0°
0°
0°
0°
Vibrator 2 0°
72°
144°
216°
288°
Vibrator 3 0°
144°
288°
72°
216°
Vibrator 4 0°
216°
72°
288°
144°
Vibrator 5 0°
288°
216°
144°
72°
______________________________________
- , 72°
-
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14. A method of simultaneously conducting n seismic vibrator surveys, where n is a whole number greater than 2, comprising:
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(a) selecting n phase angles such that the vector summation of n vectors, each having a phase angle corresponding to a different one of said selected phase angles, is substantially zero for equal length vectors; (b) simultaneously transmitting n times with n vibrators n signals; (c) detecting the n signals resulting from the n simultaneous transmission of the n signals; (d) varying the initial phases of said transmitted signals among said selected phase angles to enable the signal transmitted by each of the n vibrators to be separated from the n detected signals by data processing. - View Dependent Claims (15, 16)
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16. The method of claim 14 wherein an even number of vibrator sources are used and the phase angles are selected such that for any given selected phase angle, the phase angle 180°
- out of phase with said given selected phase angle is also selected.
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Specification