Seismic wave generator
OwnerDaniel Silvermaninventor
Life of this patent
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Abstract
A seismic wave generator and method of using it, which comprises a vertical array of sources at known spacings, for detonation in a seismic wave propagating medium of known seismic velocity; means to initiate the sources in time sequence in a selected series of known different time intervals and recording the seismic waves at a distant location to provide a first electrical signal; and correlating the first electrical signal with a second electrical signal derived from the pattern of initiation, as modified by the travel times of the waves between the several separate charges.
Claims34
In an apparatus for generating seismic waves which includes a substantially vertical array of separate impulsive sources (ISs) spaced apart in a wave propagating medium, and at least a first seismic sensor, for converting the received seismic waves to electrical signals, said first seismic sensors spaced apart from said array, amplifier means, and recording means;
- the method of operation to provide optimum information of the subsurface, comprising the step of;
- (a) initiating sequentially the plurality of ISs in said vertical array in a first time sequence;
- (b) detecting the seismic waves at said first seismic sensor generated by said initiations after travel through the earth, and producing, and at least temporarily storing a first electrical signal;
- produced by said first seismic sensor;
- (c) determining the time intervals between downtraveling seismic waves from said ISs in said array and producing a second electrical signal;
- which is an electrical signal facsimile of said downtraveling seismic waves;
- (d) correlating said first electrical signal with said second electrical signal to produce a first correlogram;
- whereby said first correlogram will indicate the presence of upwardly reflected seismic waves from below said array, generated by the downtraveling seismic waves from said array.
Apparatus for generating seismic waves which includes a seismic wave propagating medium and at least a first seismic sensor for receiving seismic waves from said apparatus after traveling through the earth, and to produce a first signal which is an electrical signal, which is a facsimile of the seismic waves received by said seismic sensor;
- (a) a substantially vertical array of impulsive sources (ISs) spaced apart, in said propagating medium;
- (b) means to initiate successively said ISs in a first known time sequence;
- (c) means to determine the time intervals between the downtraveling seismic waves from said array, and means to produce a second electrical signal, which is an electrical facsimile of said downtraveling seismic waves;
- (d) means to correlate said first signal with said second signal to produce a first correlogram.
In a seismograph exploration system, including a seismic wave generator, comprising an array of a plurality of impulse sources (IS) which can be activated in the earth in a known time sequence, said ISs positioned at different depths below the surface of the earth, the depths of at least two being known, at least one seismic sensor spaced apart from said ISs, amplifier means and recording means, the method of operation to provide optimum information of the subsurface, comprising the steps of;
- (a) initiating sequentially the plurality of ISs in said vertical array in a first known time sequence;
- (b) detecting the seismic waves generated in the earth by said initiations, at a first sensor displaced from said array, and producing, and at least temporarily storing, a first electrical signal;
- produced by said first sensor;
- (c) producing a second electrical signal comprising a time series of electrical pulses, equal in number to said ISs, in a time sequence equal to said first time sequence, as modified by the relative vertical positions of said ISs and the known velocity of seismic waves in the earth;
- (d) correlating said first signal with said second signal to produce a first correlogram;
- whereby said first correlogram will indicate the presence of upward reflected seismic waves from below said array, generated by the downtraveling seismic waves from said array.
Dependencies are inferred from the claim text.