CONTINUOUS COMPOSITE RELATIVELY ADJUSTED PULSE
First Claim
1. A process for acquiring seismic data and provide information about geologic structures in the earth, wherein the process comprises:
- a) providing a plurality of seismic receivers to receive seismic energy;
b) providing at least one pulse-type seismic source to emit pulses of seismic energy into the earth;
c) firing a distinctive series of pulses of seismic energy into the earth to create a seismic energy wavefield response from geologic structures in the earth where the distinctive series of pulses of seismic energy are delivered in a continual loop or near continual loop from said at least one pulse-type seismic source in a planned order where the loop is of sufficient length to provide listening time to receive the wave field response from the geologic structures in the earth from a portion of the loop defined as a composite pulse before the distinctive series of pulses of the loop end and are restarted and wherein the series of pulses within the loop are sufficiently distinctive so as not to confuse parts of the loop with other parts of the loop and sufficiently distinctive so as to distinguish the wavefield caused by the loop from seismic energy in the environment that arises from other sources;
d) receiving seismic energy with the plurality of seismic receivers including the seismic energy wavefield response from the geologic structures in the earth;
e) recording the seismic energy wavefield response received by the seismic receivers to form data traces; and
f) processing the data traces of recorded seismic energy to separately identify within the data traces the composite pulses of the pulse-type seismic source when the composite pulses were fired.
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Accused Products
Abstract
The invention relates to continuously or near continuously acquiring seismic data where at least one pulse-type source is fired in a distinctive sequence to create a series of pulses and to create a continuous or near continuous rumble. In a preferred embodiment, a number of pulse-type seismic sources are arranged in an array and are fired in a distinctive loop of composite pulses where the returning wavefield is source separable based on the distinctive composite pulses. Firing the pulse-type sources creates an identifiable loop of identifiable composite pulses so that two or more marine seismic acquisition systems with pulse-type seismic sources can acquire seismic data concurrently, continuously or near continuously and the peak energy delivered into the water will be less, which will reduce the irritation of seismic data acquisition to marine life.
42 Citations
28 Claims
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1. A process for acquiring seismic data and provide information about geologic structures in the earth, wherein the process comprises:
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a) providing a plurality of seismic receivers to receive seismic energy; b) providing at least one pulse-type seismic source to emit pulses of seismic energy into the earth; c) firing a distinctive series of pulses of seismic energy into the earth to create a seismic energy wavefield response from geologic structures in the earth where the distinctive series of pulses of seismic energy are delivered in a continual loop or near continual loop from said at least one pulse-type seismic source in a planned order where the loop is of sufficient length to provide listening time to receive the wave field response from the geologic structures in the earth from a portion of the loop defined as a composite pulse before the distinctive series of pulses of the loop end and are restarted and wherein the series of pulses within the loop are sufficiently distinctive so as not to confuse parts of the loop with other parts of the loop and sufficiently distinctive so as to distinguish the wavefield caused by the loop from seismic energy in the environment that arises from other sources; d) receiving seismic energy with the plurality of seismic receivers including the seismic energy wavefield response from the geologic structures in the earth; e) recording the seismic energy wavefield response received by the seismic receivers to form data traces; and f) processing the data traces of recorded seismic energy to separately identify within the data traces the composite pulses of the pulse-type seismic source when the composite pulses were fired. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification