Vibrator and processing systems for vibratory seismic operations
First Claim
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1. Apparatus for seismic prospecting, comprising;
- a. a force generating means reference sweep signal comprising a square wave analog signal having succeeding plus and minus zero crossings, of variable frequency, of selected band width, and of selected time duration;
b. a force generating means responsive to said square wave reference sweep signal to create a train of alternately reversing forces on the earth, creating an oscillatory displacement of the earth at a first point on the earth;
c. means responsive to a sensor means to generate an oscillatory analog electrical signal responsive to said oscillatory displacement of the earth at said first point, and to provide a transmitted signal digitized to 1 bit;
d. means to detect the seismic wave generated by said force generating means after passing through the earth, at a second point distant from said first point, and, means to produce a detected signal.
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Abstract
Method and apparatus for carrying out vibratory seismic operations and processing seismic records, involving generating a square wave analog sweep signal for driving a vibrator, generating a square wave analog, or 1 bit digitized transmitted signal, digitizing the received signal to 1 bit, and correlating the 1 bit digitized received signal with the 1 bit digitized transmitted signal, and stacking a plurality of such 1 bit correlograms. Simple logic means are disclosed for performing a 1 bit × 1 bit correlation. Means are disclosed for generating a square wave analog sweep signal.
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Citations
20 Claims
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1. Apparatus for seismic prospecting, comprising;
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a. a force generating means reference sweep signal comprising a square wave analog signal having succeeding plus and minus zero crossings, of variable frequency, of selected band width, and of selected time duration; b. a force generating means responsive to said square wave reference sweep signal to create a train of alternately reversing forces on the earth, creating an oscillatory displacement of the earth at a first point on the earth; c. means responsive to a sensor means to generate an oscillatory analog electrical signal responsive to said oscillatory displacement of the earth at said first point, and to provide a transmitted signal digitized to 1 bit; d. means to detect the seismic wave generated by said force generating means after passing through the earth, at a second point distant from said first point, and, means to produce a detected signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A seismic prospecting system comprising;
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a. means to generate an oscillatory time function of ground motion in the earth, responsive to a square wave reference signal, of a variable frequency, of selected frequency content and time duration, at a first point on the earth; b. means to provide an electrical transmitted signal of said oscillatory time function of ground motion, and wherein said electrical transmitted signal varies in phase from said reference signal due to phase shift in said means to generate, and means to digitize said electrical transmitted signal to 1 bit; c. means at a second point distant from said first point to detect said ground motion after transmission through the earth, and to produce a received signal, and means to digitize said received signal to 1 bit; and d. means to correlate said 1 bit electrical transmitted signal with said 1 bit received signal. - View Dependent Claims (12)
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13. An improved seismic system comprising;
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a. a vibrator comprising two parts relatively reciprocable, one part attached to a reaction mass, and the other part attached to a base plate positioned on the earth; b. a reference sweep signal comprising a square wave signal of variable frequency of selected frequency range and time duration; c. means responsive to said square wave reference signal to drive said vibrator so as to impress alternately reversing forces on the earth at a first point on the earth; d. means to detect the alternating displacement of said baseplate, and to provide a transmitted signal representative of the seismic wave generated in the earth; and e. means to digitize said transmitted signal to 1 bit. - View Dependent Claims (14)
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15. Apparatus for seismic prospecting comprising;
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a. a timing means to generate a train of time-spaced unidirectional electrical pulses of continually changing time interval between adjacent pulses; b. means to invert alternate pulses to provide a train of alternately reversing electrical pulses; c. force generating means responsive to said train of alternately reversing electrical pulses to apply to the earth a corresponding train of alternately reversing forces, at a first point on the earth; and d. means to detect the seismic wave generated by said force generating means after passing through the earth, at a second point distant from said first point, and means to produce a detected seismic signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification