SU737903A1 - Electric geosurvey method - Google Patents

Description

(54) GEOELECTRIC METHOD

one

The invention relates to the field of exploration geophysics by the method of isolines and can be used for prospecting ore sites).

The known method of geoelectrical exploration according to the method of isolines, according to J, the second one, investigates the potential field of two supply electrodes located on the 1I surface.

The known method has a significant drawback. Since the field of linear electrodes in most parts of the tablet has a horizontal direction, THAT; the vertical dimensions of the ore bodies practically have no significant effect on the nature of the isolines. Therefore, when screening them, the effect of the surface layers of the loose formations of the known method has a low depth of search.

The known method is geoelectroscopic, which consists in creating an electric field with two pi electrodes, one of which (point) is placed in the well, and the second on the day surface, and then measuring the potential of the electric field and fixing its isolines 2, However, the known method does not allow the isolation of isomalies.

JHiiM fertbiSiV shale lines caused by shale, - - The purpose of the invention is to increase the depth of exploration in conditions of ore bearing bg body in low-grade Shykh; Shantsy - ----- -

  The goal is achieved by supplying the electrode with a pinch, and the isolates of the potential are produced, ieo, in the feed zone. installations behind a linear electrode; at the same time, 1fr1CH: ayyayey distance between the squash and-linear electrode at

5 surfaces are chosen not more than 0 0 ,, and the immersion depth of the point electrode is in inverse relationship within 1.25-0.5 6/2, where is the length of the linear electrode.

20

FIG. 1 is a schematic representation in terms of the relative position of the point light (B) in the well and the linear electrode (A) on the surface, and also shows the area

25 observations within which the potential is monitored

(shaded privately); FIGS. 2 and 3 give a cross sectional arrangement of the electrodes, as well as

Claims (2)

30 interaction of vectors of the stress of an electric field at a point at a certain depth; fih, 4 shows the nature of the isolines of the potential of the electric floor; in fig. 5 graphically shows the results of an experiment at the Chusovsk copper-pyrite deposit. The method is obscure. in the following way. . . A linear electrode is fixed on the surface of the earth and at a distance from it in the well bore; The point electrode is placed in, In the circuit, the electrodes are connected to a constant or alternating source and in the outer zone of the power plant, behind the linear electrode, electrically crawled by measuring the potential and fixing its isolines. .. I:, - Tai; as a veteran, for example, gender Gen U and Ets are approached from a certain angle, then there is some compensation from the maximum; Because of the horizontal component of the vector E, the relative field gradient is. the observation plane should increase and, therefore, ftp6 will increase the anomaly gain. Under, the relative gradient of the floor is the ratio of the anomalous and the normal and the ry with the averaging of the floor. h -. In addition, there is a vertical composition. l the tension field, and the resultant vector is located inclined. Therefore, with such a structure, the floor will be actively used with the vertical size of the ore body, which is shown; 3.; 1 a1: 1b about size, used by sov-,. the field of the point electrode (the ground in the well) and the linear type electrode; moreover, the anromality examines V CH only against the background of the Zero, linear electrode. It was established at what depth of the electron point s. the well and at what distance of the well from the distance, the non-DFM electrode is the occurrence of a three-dimensional electric switch on the Yellow Line, observed from the outside (floor) of the Linear Bridge. For this, this was done; Theoretical calculations and laboratories: general experiments, which allowed choosing the optimal dimensions of the installation, with KOTOpbix, the electric field in the exterior is the most homogeneous. In figs; 4 shows the character of the isolines of /, this bil at one of the optimal installation dimensions (, 5,, 5). Here, H is the depth to the point-type electrode, L is the shortest distance between the well and the linear electrode along the surface. Both of these values are given in heaps of noon; now electrf. As in fvV4, the electric field, in the outer zone of the installation, HoiW is valid-uniform.; On a considerable area, it is established by calculations that the uniformity of the floor can be reached, at the following values of H and L; ; , 0.750.10-0.25 0.500.25-0.50 1.00. 0.10 1.25. . 0-0.10. Model tests proposed. method showed that it has a much greater depth than the known method. In addition, it allows the object to be detected to be located even if the linear electrode is located parallel to the long side (sweeping) of the body. The latter is quite significant when the ore body is located in a regionally elongated band of metamorphic shale, which is sash. have significant electrical conductivity. The method was tested in the order of the experiment at the Chusovskoy copper-nickel deposit. FIG. 5 shows the results obtained. The point electrode was placed in borehole 2063 at a depth of 145 m and its projection was 84 m along the horizontal of an ohm linear electrode. The length of the linear electrrda was 500 m. At a time, the river 15k was complicated by the bed of the Chusovoi River flowing here. The ore zone, represented by three small ore bodies, is clearly distinguished by the intense bends of the isolines. For comparison, two contour lines were traced when assigning the to infinity of the crimped electrode to i. investigated the field of only one linear electrode. Ka, it can be seen, bends on these lines Very weak. The examples given make it possible to judge the high resolution of the proposed method. The invention The method of geoelectrical exploration, which consists in the creation of electrical. floor using two feed-electrodes,. one of which is point-like and placed in the well, and the second is scattered on the surface, measuring the potential and fixing its isolines, oh, l and h and y with the fact that, in order to increase the depth of development, x ore deposits are located in low-resistance conductive shales, the second supply electrode is spread parallel to the strike of the shale, and the potential measurement is taken over the surface of the supply unit behind this electrode; the shortest distance between the well and the linear electrode choose not more than 0.5 E / 2, and the immersion depth of the point electrode is in inverse relationship within 1.25-0.52 / 2, where e is the length of the linear electrode. Sources of information taken into account during the examination 1. P. RODIONOV F., Pruzhinsky L.M. somemetodi on metpicchk-ichiptomElektrometri method equipoten 737903 social lanes in the Urals, Trudy. VNIGRI, 1936, W., vol.54. 2. Sakovtsev GP, Redozubov A, A. Methods of borehole electrical prospecting Kypby-Kyo-1t Gyozhk 1) torii, f., Nedra, 1968, yr tjt-gatitt p.83 (prototype). By Wt iput.l BUT s t. L res. tpui 2