SU1226385A1 - Method of geoelectric prospecting - Google Patents

Abstract

This invention relates to the exploration of minerals by the method of induced polarization. The purpose of the invention is to increase the reliability of the allocation of anomalies associated with the effect of induced polarization, improve measurement accuracy and reduce the time spent on interpretation. In electrical prospecting by the method of induced polarization, the electric or magnetic field is measured with several configurations of the supply line placed along an arbitrary closed loop, with one of the configurations being a non-speci fi c loop. 6 Il. (L 1C Od 00 CX SP

Description

This invention relates to geophysics. and more specifically to methods of intelligence method evoked potentials (VP).

The purpose of the invention is to increase the reliability and accuracy of the isolation of galvanic effects.

Figures 1 to 6 show a series of power line configurations with grounding,

The square contour is formed by a 1-D dot-ud, selected on the ground, located at the vertices of the square. A point of 5 measurements is selected inside the contour. Grounds are placed at selected points 1–4, selected points are connected by wire segments 1–2, 2 ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– a line, the direction of the current in which is indicated by an arrow (the generator group is included in the line break and in FIGS. 1-6 is not shown).

Thus, in FIG. 1, there are four earths at points IA and four pieces of wire l - 2j 2-3, 3-4 and 4-ij in FIG „2 - two zazeg-shadows at points 2 and 3 and one U-shaped Ms. Line 3-4-1-2; in fig „3 - two zazg-stes in points 3 and 4 and one U-shaped supply line 4--1-2-3 in fig, 4 two ground connections in points 1 and 4 and one 1Т shaped supply line 2-3-4; Fig. 5 shows two ground connections at points 1 and 2 and one U-shaped peak of the line 2-3-4-1 j in FIG. b, all ground connections are disconnected, the excitation is performed with a non-erect loop.

Sspchsob implement as follows.

Ra.skla, tsyvagot on the surface of the Earth along a square contour with vertices at the points of four segments of the wire -25 2-3. 3-4 and 4-1. Having provided in each of the points 1-4 of the excitation circuit, the possibility of switching for connecting the ends of the wires to the specimens with simultaneous connection of the resulting supply line to the generator. Then sequentially switching the segments wires 1-2, 2-3, 3-4r 4-1 in accordance with the table.

ten

35

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After drying, each of the combinations is measured at a given point 5, the resulting signal of the induced polarization is obtained and, and, Uj5 and ,, Uj, and the average value for measurements with the peak line 1 is calculated. four

and U; (. + i),

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30 then the signal due to galvanic currents is sent without affecting induction effects;

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about rmu l and inventions

The method of geoelectromagnetic exploration in which the systems are laid out on the ground, which are exciting in the form of wire segments connected to the generator at selected points and forming an excitation circuit of a given shape, measure the induced polarization signal at the given point that differs from that. The reliability and accuracy of electroplating effects are carried out successively at selected points of the excitation circuit, switching the wire segments, connecting them to grounding, forming a series of power supply configurations with grounding and one ungrounded power supply. measure signal

55 induced polarization in the selected

point after each switch, calculate the arithmetic average of the signals measured by the configurations of the supply

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about rmu l and inventions

312263854

the lines with ground connections, and by differences of the signal from the ungrounded arithmetic average of the signals from the power line, judge the electrical configurations of the power cable with the ground parameters of the medium under study.

Claims (1)

Claim The method of geoelectrical exploration, in which an excitation system is laid out on the ground in the form of wire segments connected to a generator at selected points and forming an excitation circuit of a given shape, a signal of polarization induced at a given point is measured, characterized in that, in order to increase the reliability and accuracy of galvanic isolation effects, carry out sequentially at selected points in the excitation circuit the switching of wire segments, connecting them to the ground, forming a series of configurations of the supply line to the ground and one non-grounded supply line, measure the signal of induced polarization at the selected point after each switching, calculate the arithmetic average of the signals measured for the supply line configurations with grounding, and the difference of the arithmetic average of the signal configurations from the supply line with grounding and the signal from the non-grounded supply line judge the electrical parameters of the medium under study. ^σ h 5 '---- 1 ⁴ 3 Figure 1