METHOD FOR GEO-ELECTRO-SURVEYING WITH FOCUSING OF ELECTRIC CURRENT (VARIANTS) Russian patent published in 2006 - IPC G01V3/06 

FIELD: geophysical research, possible use for finding and contouring oil-gas deposits.

SUBSTANCE: method includes excitation of electromagnetic field within thick portion of researched environment, by letting through it a periodical series of rectangular current pulses with pauses between each one of them serially from two dipole sources. Between current pulses in pauses along whole length of these, momentary values of first and second axial and second orthogonal potentials differences are measured when resulting first difference of potentials between extreme measuring grounding parts is equal to zero. Along whole duration of each pause two momentary values positioned adjacently in time of first and second differences of potentials are selected, determining differences between their values. From values of differences, three normalized electrical parameters are calculated. Reverse problem is solved on basis of differential fading wave equation of mathematical physics for strength of dipole source in electrochemically self-polarizing conductive environment. Model of environment, most close to geometrical structure and electrical parameters of researched environment, is determined, and temporal cuts are constructed by electric conductivity, coefficient of caused polarization and time of fading of difference of potentials of aforementioned caused polarization.

EFFECT: increased success coefficient of searches for oil-gas deposits.

2 cl, 4 dwg, 1 tbl