Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1974-10-04
1977-05-31
Moskowitz, Nelson
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181116, 181401, 175 50, G01V 112, G01V 104
Patent
active
040263827
ABSTRACT:
This invention describes an apparatus and method for generating seismic waves in the earth for seismic geophysical prospecting. It involves a slender pipe open at the lower end, which can be driven into the earth to a shallow depth. The upper end is closed. Means are provided for introducing oxygen and acetylene through a pair of control valves and check valves, for a selected period of time. The oxygen and acetylene are mixed in the pipe and flow downward through the pipe and through the perforations into the earth, and fill the voids and fissures in the shallow sediments. Means are provided in the top end of the pipe to detonate the gas mixture. The detonation wave travels down the pipe and eventually reaches the openings at the lower end, and detonates the gas in the pores and fissures of the earth. The resulting explosion opens up the fissures and provides a larger void space than was there before. The seismic waves generated by the explosion are detected in the normal manner by means of transducers, cables, amplifiers, recorders, etc.
The pipe is pressed further into the ground as the result of the expansion of the void space, and the operation of filling the void space with combustible gas and detonating the gas is repeated, until on each succeeding operation, the volume of gas introduced becomes large enough to create a seismic wave of sufficient intensity to provide a satisfactory seismic record.
REFERENCES:
patent: 1627991 (1927-05-01), Owen
patent: 2073493 (1937-03-01), Salvatori
patent: 2353484 (1944-07-01), Merten et al.
patent: 2614804 (1952-10-01), Carlisle
patent: 2721617 (1955-10-01), Piety
patent: 2816618 (1957-12-01), Piety
patent: 3623570 (1971-11-01), Holloway
patent: 3752256 (1973-08-01), Mollere
Field Harold S.
Mitchell Donald K.
Moskowitz Nelson
Silverman Daniel
Silverman Daniel
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