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Computer-based system for acquisition of nuclear well log data

  • US 4,471,435 A
  • Filed: 08/03/1981
  • Issued: 09/11/1984
  • Est. Priority Date: 08/03/1981
  • Status: Expired due to Fees
First Claim
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1. Apparatus for acquisition of spectral gamma ray well logging data from electrical pulse signals produced by detection of gamma ray emmissions from a subsurface formation, comprising:

  • a signal recovery unit for receiving electrical pulse signals indicative of the energy of detected gamma rays and producing digital data representative of the spectrum of the detected gamma ray energies, said signal recovery unit comprises a pulse height analyzer responsive to an electrical pulse signal for producing a digital code representative of the peak amplitude of the pulse signal, a random access memory for accumulating counts of detected gamma rays according to energy level in addressable locations therein said memory being coupled to the pulse height analyzer so as to be addressed by the digital code, and means for incrementing the count in a memory location addressed by the pulse height analyzer digital code and control logic coupled to the pulse height analyzer, the memory and the incrementing means for controlling the incrementing of a count in an addressed memory location;

    a spectrum display coupled to the signal recovery unit for formating and processing for presentation of spectral gamma ray well logging data as a plot of relative gamma ray emissions activity versus energy level; and

    a central processing unit, for issuing control commands to the signal recovery unit control logic and the spectrum display to sequence the acquisition and presentation of spectral gamma ray well logging data.

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