SU66588A1 - Electric Intelligence Method - Google Patents

Description

In the case of electrical prospecting, both direct and alternating current, only the difference in electrical conductivity of rocks is usually used. Thus, for example, structural reconstructions are based on non-conductive or, on the contrary, well-conducting horizons, which, by their elements of the occurrence, sufficiently characterize the explored tectonic form. In the design of metallic minerals (for example, sulphide lenses), the difference in electrical conductivity of the mineral and host rocks, etc., is used directly.

The proposed method is based on the use for reconnaissance of some of the elements occurring in the ground when an alternating current passes through it. It is well known that the series of minerals has the property of detecting alternating current {a well-known example is galena). Experience has shown that some rocks also possess the same property, although “to a lesser extent. Therefore, during the passage of alternating current in the ground, one can observe the emergence of a constant electromotive force. associated with such MiH events as direct detection, the difference in electrochemical reactions, the difference in the accumulation of electrical energy, etc.

The proposed, according to the specifications; The method of elactric reconnaissance is to measure these constant electromotive forces on the earth's surface. in mining workings or boreholes and the study of their dependence on direction, power and frequency of the alternating current.

The proposed method can also be applied to determine the direction of movement and the velocity of groundwater.

The invention is illustrated in the drawing, in which FIG. 1 principle scheme of the method., FIG. 2 shows an example of the execution of a measuring value circuit, and FIG. 3 is a variation of the application of the method for the case of carotene observations.

An alternating current supply (Fig. 1) with a frequency of 5 hertz to radio frequencies inclusive is created in the earth by a generator 1 using an inductor for electrode-electrodes, or by other means. By-time, the direction of which is shown by blatant lines, produced by explored object 2, the latter being considered as a source of direct current. The direction of the direct current is shown by dotted MI lines. Permanent electromotive forces on the surface of the earth; The forces are determined by the measuring device 3, which, at frequencies of supplying alternating current of about 25 hertz or more, can be used as a direct current galvanometer.

Prc low frequencies of the alternating current to compensate for the alternating current appearing in the measuring circuit: Due to the difference between the potential; the potentials on the M and N electrodes, induction "etc., and bypassing an alternating current compensator, an example of which is given in FIG. 2. The supply circuit, including the generator / and ammeter 2, is connected to the overcurrent compensator / C by means of a transformer 5 (it is also possible to connect directly). The compensator consists of a variometer 4, in the primary winding of which the alternating resistance is switched on 5. If the keys are set to b. and phase (lower key position).

In addition to the compensator, the measuring circuit includes a QI | 0 meter 8 type of Schlumberger with a compensator polarization 9 (or a semi-tactile 1p | Giotrator).

The measurement process is as follows. Prior to the passage of the alternating current IB, the supply circuit is compensated for the potential difference in the measuring circuit MN

with the help of a polarization compensator 9. Then the alternator is turned on / and the current / measured by the supply circuit AB is measured by an ammeter 2. By selecting the connection between the primary and secondary windings of the variometer 4 and the resistance 5, there is no sound in the telephone 10 (when the halvanometer of Schlumberger potentiometer 8 is locked). Thereafter, a drop in the DC voltage U U is measured.

The ratio D f /: / is a par. Meter 01.m to characterize the geological structure of the study area.

The reciprocal arrangement of the soaring and measuring circuit may be different. It is thus possible to observe according to the scheme of vertical electric zandirovany or any type of profiling. In particular, a similar method can be used as an auxiliary when conducting vertical electrical soundings in oil exploration and profiling by measuring resistance in coal exploration, ozokerite, etc.

As a self-propelled method, the proposed technique can be used in the exploration of metallic minerals, in profiling, at the position of the supply chain; in the form of the Lundberg floor or the floor of the Sundberg square (intensity method), an infinitely long straight cable l.

As an auxiliary method, it can be attracted when isolines are used to measure contours of alternating magnetic fields (interest induction) by isolines.

The range of frequencies used in the method can be very wide - from several periods per second (for example, the frequency of the pulsator) to radio frequencies (used in the method of measurement and one-meter methods).

Instead of the variometer 4, parts of the device can be used,

for example, Geiger or Thomson bridge.

In case of carotene research, the device of FIG. 2 may be used to avoid the effect of the inductance effect and the wires. 3

On a three-wire cable into the well. A projectile is inserted, from which a DC motor 1 and an alternator 2 coupled with it are enclosed. The motor / is driven from the power source 3 by two wires.,

From the generator 2, through the bottom of the projectile, two wires terminated, terminating in the supply electrodes L and S.

A third cable cable is passed through the casing, skimming along with one of the measuring electrodes M.

In addition, the 1 given electrode M in FIG. 3, may be a suitable position and any other position depending on the optimum working conditions.

The other measuring electrode N is on the surface. The observation is maintained by the three aid of the semi-automatic recorder ,.

The part of the MN wire (from M to-o) should be represented by the armored cable, the armor of which (covered with insulation).

The frequency range can be significant, from several periods per minute (for example, when combining 1-battery and 2 - pulsator) to radio frequencies. In the latter case, 1 will be the nutrient circuit, and 2 will be the oscillating circuit. In this case (. Because all the power can be

concentrated in the snare (1 d in vi; de dry batteries) for the measurements all three cores of the cable can be used in various combinations. When using the method to determine the direction of movement and velocity of groundwater, one of the electrodes of the orty supply circuit is bore into the well to the level of the studied horizon, into which salt or electrolyte is introduced, and the other electrode is at a considerable distance. An alternating current of arbitrary frequency (from 5 hertz to radio frequencies inclusive) is passed through the power supply circuit. On the surface of the earth, constant e are measured. d. with., arising in the earth at passage of alternating current in it.

Subject invention

Claims (2)

1. The method of electro-intelligence of minerals with the help of alternating current (frequency from 5 hertz to radio frequencies inclusive), created in the earth one way or another (for example, by means of grounding electrodes or inductively) and with the fact that on the surface of the earth, in mine workings or boreholes, constant electromotive forces arising in the ground during the passage of alternating current are measured (or applied) and the dependence of these electromotive currents is studied. d. on the direction, strength, and frequency of the AC power. 2. The application of the method according to p. 1 d. Of determining the direction of the two: e11 and the velocity of groundwater. №-66588 , "