[en] Interpretation of borehole geophysics data by means of conventional methods occurs to be unsatisfactory in cases of identification of reservoir rock horizons and valuation of their saturation. This makes a situation, when within any geological section only some selected horizons are practically considered, so that other interested horizons may be overlooked. Continuous and objective results through entire section are atteined by means of standard geophysical well logging, based on theoretic principles of classical interpretation. This method is of great value for regional studies of selected areas or formations, when number data of different value should be considered because of use of different equipment. Some variant procedures applied in interpretive works and solved with use of analog and computer techniques are discussed too. (author)

[en] The different methods of well logging for geological application have been presented. Especially, gamma logging, spectrometric gamma logging, gamma-gamma logging, neutron-gamma logging and logging with use of neutron sources have ben described in detail

[en] The report gives a summary of the theoretical and expeimental work on borehole probes that has been performed since 1971 at The Department of Electrophysics, The Technical University of Denmark. The first part of the report concerns the use of a spectral natural gamma-ray probe (SNG-probe), which is used for measurements of the spectral distribution of the gamma-rays of the geological strata around a borehole. In general the spectrum is divided into three parts - the gamma-rays from potassium-40, from thorium-232 and daughters, and from uranium-238 and daughters. A set of curves showing the intensities of the gamm-radiation from K, Th, and U versus depth is called a SNG-log. If proper calibrated, the SNG-log gives the concentration of Th, U, and K in the formation surrounding the borehole. Initially the basis for an interpretation of SNG-logs is discussed. Then follows a description og some SNG-problems designed and built by The Department of Electrophysics, and a discussion of the calibration of SNG-probes. Some examples of SNG-logs are presented, and some general comments on the use of SNG-logs are given. The second part of the report concerns mainly the development of theoretical models for neutron-neutron probes, gamma-gamma probes, and pulsed-neutron probes. The purpose of this work has been to examine how well the models correlate with measured results and - where reasonable agreement is found - to use the models in studies of the factors that affect the probe responses in interpretation of experimental results and in probe design. (author)

[en] This work presents the FLOZ program for nuclear well logging data interpretation. Program has been written in FORTRAN 1900 language for ODRA 1300 computers. The description of the program possibilities and the ways of its application are given. Short presentation of the interpretation method used here and the description of the program work with its complete listing, together with the explanatory commentaries are also presented. The type of interpretation performed by the program depends upon the kind of nuclear logging of interest. For neutron-gamma and gamma-gamma logging the program introduces the corrections for the following disturbing factors: the ratemeter time constant, the logging speed, the apparatus dead time, the gamma-ray background. The gamma-ray logging is corrected for the following disturbing factors: ratemeter time constant, the logging speed, the apparatus dead time of tool, borehole radius, gamma-ray absorbtion in the borehole liquid and the finite thickness of the layers. The calibration constant for gamma-ray probe can be introduced for calculations of radioactivity ore grades. The log deflections being the input data for the FLOZ program, are taken from specially prepared magnetic tape. The results of interpretation are written on magnetic tape, according to the X3GY system for the ODRA 1300 computers. The method of interpretation which is applicated in program FLOZ was elaborated by Prof. J.A. Czubek from Institute of Nuclear Physics in Cracow. (author)

[en] The principles and applications are outlined of gamma logging, gamma-gamma logging, gamma-neutron logging, X-ray fluorescence logging, neutron-neutron logging, neutron-gamma logging, and neutron activation logging. (Z.S.). 8 figs., 15 refs

[en] Experiences are described with logging in mines and using an electrologging resistance method in potential and gradient connections, an electrode potential and sliding contact method, spontaneous polarization, gamma logging, gamma-gamma logging, inclinometry, and magnetometric field measurement. A manually operated dipping equipment was developed for measurements in boreholes inclined by 0 to 180 deg from the vertical. The most difficult problem in mine logging is the organizational ensurance of measurement while all safety regulations are observed rather than technical questions. (Ha)

[en] A modular logging kit, G 1 was developed for narrow-profile boreholes of 46 mm in diameter in mines and complex terrain conditions. The following probes 30 to 32 mm in diameter are part of the kit: S-30-A radiometric probe for gamma logging, S-30-13 probe for gamma-gamma logging and neutron-gamma logging, a probe for measuring low energy (15 to 250 keV) gamna quanta, a probe for natural gamma radiation spectrometry, symmetric electrologging resistance probe SOM 0.5, a gradient resistance probe, and a probe for magnetic susceptibility measurement. In 1978 the equipment will be completed with a cavity meter, resistivity meter, and a thermometer. The operational capacity of the logging kit was tested by measurements in 80 boreholes in several localities. The results of selected logging measurements in carbonate rock deposits, a polymetallic sulfidic deposit, and in a magnetite deposit are given as examples. (Ha)

[en] As part of the Department of Energy's National Uranium Resource Evaluation (NURE) project's Technology Development effort, a number of computer codes and accompanying data bases were assembled for use in modeling responses of nuclear borehole logging Sondes. The logging methods include fission neutron, active and passive gamma-ray, and gamma-gamma. These CDC-compatible computer codes and data bases are available on magnetic tape from the DOE Technical Library at its Grand Junction Area Office. Some of the computer codes are standard radiation-transport programs that have been available to the radiation shielding community for several years. Other codes were specifically written to model the response of borehole radiation detectors or are specialized borehole modeling versions of existing Monte Carlo transport programs. Results from several radiation modeling studies are available as two large data bases (neutron and gamma-ray). These data bases are accompanied by appropriate processing programs that permit the user to model a wide range of borehole and formation-parameter combinations for fission-neutron, neutron-, activation and gamma-gamma logs. The first part of this report consists of a brief abstract for each code or data base. The abstract gives the code name and title, short description, auxiliary requirements, typical running time (CDC 6600), and a list of references. The next section gives format specifications and/or directory for the tapes. The final section of the report presents listings for programs used to convert data bases between machine floating-point and EBCDIC

[en] The possibility of using a standard complex of industrial geophysical methods to identify bitumen-saturated reservoirs in a ferrigenous-carbonaceous section of Upper-Kazan' substage with a compex structure, is considered. A significant role of radioactivity logging methods is shown. The gamma logging method records gamma radiation intensity against the stratum investigated and the key horizon; while the method of neutron gamma logging registers the intensity of gamma radiation of radiation capture of thermal neutrons in the stratum investigated and in the key horizon

[en] A description is given of a rugged, mobile, nuclear geophysical borehole logging system, designed and constructed as part of a research project to develop in situ methods of chemical analysis for the mining industry. Logging rates of up to 9m/min to a depth of 600 m are possible. Modular design permits rapid changeovers either of entire probes of modifications to shielding, detectors, and radiation source of any basic probe. The instrumentation is capable of high resolution scintillation spectrometry, presetting of vertical response profiles, and on-line output of both raw and processed response data on perforated paper tape suitable for computer imput. (author)