GEANT4 like computational tool of nuclear geophysics

Nuclear geophysical methods are considered to be the most informative and important for monitoring oil and gas fields. Traditionally for their development statistical calculations by Monte Carlo method are used, which allows from one side to reduce natural modeling, and from the other side to obtain parameters fundamentally not achievable by direct measurement, for example, the basic gamma spectra. This technique, though quite expensive in terms of computing resources is both versatile to accommodate a variety of physical processes and to modeling facilities with complex geometries and elemental composition. There are several multi-purpose software packages for the simulation of nuclear processes in the material, among which are the MCNP, FLUKA and GEANT4.

For the nuclear logging methods simulation authors have chosen the GEANT4 package - a multipurpose program complex with open-source software, which has the required functionality. GEANT4 package has been developed at CERN to simulate the physical processes taking place during the passage of elementary particles through matter.

The paper describes the experience of GEANT4 use to simulate the main nuclear-geophysical methods: gamma spectrometry logging, neutron-neutron and pulsed neutron-gamma spectrometry logging.