Passive geophysical prospecting apparatus and method based upon

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

324344, G01V 312, G01V 340

Patent

active

057774781

ABSTRACT:
An apparatus and method for passively determining the depth and thickness of a subterranean geologic formation bearing hydrocarbons, e.g., oil and/or gas, or commercially important ore deposits, e.g., precious metals. The apparatus has an antenna to pick up extremely low frequency signals naturally emanating from the Earth's surface. In a preferred embodiment, the received signal is amplified and filtered. The signal is then modulated onto a carrier wave. The modulated signal is then filtered to eliminate one of the sidebands, for example, the lower sideband. An oscillator generates a tuning frequency which is then beat against the filtered, modulated signal in order to tune to a particular frequency. The oscillator sweeps through the range of frequencies, e.g., in the upper sideband portion of the filtered, modulated signal. For each desired frequency within this range which corresponds to a certain depth in the Earth, the tuned signal is adjusted to the desired frequency and is sent to a voltage level detector for detecting the tuned information and converting same to pulses. The pulses are counted over a desired time period to determine the pulse density, i.e., number of pulses per unit of time. A counter may be used and set as a trigger to send an output signal when a specific number of pulses per unit time is achieved. The pulses or output signal may be displayed, recorded and/or sent to a computer and later manipulated by varying the specified unit of time, i.e., the time span, to examine the pulse density information.

REFERENCES:
patent: 2246542 (1941-06-01), Smith
patent: 2608602 (1952-08-01), Muffly
patent: 2623923 (1952-12-01), Zimmerman
patent: 3087111 (1963-04-01), Lehan et al.
patent: 3136943 (1964-06-01), Slichter
patent: 3197704 (1965-07-01), Simon et al.
patent: 3361957 (1968-01-01), Hings
patent: 3510766 (1970-05-01), Russell et al.
patent: 3662260 (1972-05-01), Thomas et al.
patent: 3679978 (1972-07-01), Hopkins, Jr.
patent: 3700933 (1972-10-01), Harkenrider et al.
patent: 3942101 (1976-03-01), Sayer et al.
patent: 3986207 (1976-10-01), Gerbel et al.
patent: 4198596 (1980-04-01), Waeselynck et al.
patent: 4409551 (1983-10-01), Norton
patent: 4434508 (1984-02-01), Sommer
patent: 4507611 (1985-03-01), Helms
patent: 4584530 (1986-04-01), Nicholson
patent: 4658215 (1987-04-01), Vinegar et al.
patent: 4686475 (1987-08-01), Kober et al.
patent: 4724390 (1988-02-01), Rauscher et al.
patent: 4825165 (1989-04-01), Helms et al.
patent: 4841250 (1989-06-01), Jackson
patent: 4945310 (1990-07-01), Jackson
patent: 5148110 (1992-09-01), Helms
Proceedings of the IEEE, vol. 67, No. 7, Jul. 1979, "The Fundamental Model of Magnetotelluric Sounding", Dmitriev and Berdichevsky.
Geophysics, vol. 50, No. 4 (Apr. 1985), pp. 656-664, "Geophysical exploration with audiofrequency natural magnetic fields", Labson, Beker, Morrison, Conti.
"Geophysical Exploration by Telluric Currents, with Special Reference to a Survey of the Haynesville Salt Dome, Wood County, Texas", Eric Boissonnas and Eugene G. Leonardon, Geophysics, Jul. 1148, pp. 387-403.
The Art of Electronics, Second Edition, Horowitz and Hill, Cambridge University Press 1980, 1989, pp. 641-655, 889, and 895-901.
Electronics Engineers' Handbook, First Edition, Fink and McKenzie, McGraw-Hill Book Company, 1975 pp. 19-23 through 19-25; pp. 22-62 through 22-64.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Passive geophysical prospecting apparatus and method based upon does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Passive geophysical prospecting apparatus and method based upon , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Passive geophysical prospecting apparatus and method based upon will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1209967

All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.