Set trinomial devices for electro


(57) Abstract:

Usage: in the prospecting for downhole or surface works when searching tanks filled with hydrocarbons, to search for other minerals, geological mapping and other geological studies. The invention each device, set the distance between the measuring electrodes, the distance between one of the excitatory and its nearest measuring electrode and the distance between the exciting electrodes are members of a number: Lr=Lr-1+Lr-2where r = 3, 4, ..., L1= G, L2=2G, G - base series. To select distances can be used similar members of the series. The package may be formed in various sets. 2 C. p. F.-ly, 1 Il

The invention relates to Geophysics, in particular to electrical exploration, and can be used for downhole or surface works when searching tanks filled with hydrocarbons, to search for other minerals, geological mapping, geothermal, geotechnical and hydro-geological studies, etc.

When conducting electro-permanent fields, in the process definition is helirovanie, and by using the methods of the natural electric field, induced potentials and intelligence variables fields are frequently used four-point or three-member probe, device, installation, characterized by the arrangement on the same line two current electrodes (source field) and two measuring (foster). Thus the second current electrode is slightly off and his influence (potential) cannot be neglected (see Y. C. Jakubowski and L. L. Lyakhov. Electromagnetics.-M.: Nedra, 1974).

In particular, the well-known symmetric probe containing two current and two potential electrodes located on one straight line (see patent Austria 378854, G 01 V 3/04, 1985). Current electrode connected to the constant current source.

However, this device does not have sufficient resolution, it is not possible with sufficient reproducibility and accuracy to detect subsurface geological features.

To eliminate these disadvantages, attempts were made to change the device configuration, i.e., the use of complex trinomial probes with the aim of obtaining redundant information, the processing of which would allow much greater confidence willsometimes complexity of the measurement process and the data processing algorithm.

The closest to the invention is a kit of three-membered devices, each of which contains two excitatory and two measuring electrodes, placed on the same line (see EP 0 013 068, G 01 V 3/06, 1979). Current electrodes connected to an AC power source, the measuring unit registers the phase shift between current and voltage. In addition, there are more pronounced electrodes.

In this complex resolution enhancement is also achieved by the complexity of the device and algorithm information processing. At the same time, not in all cases, the results of the survey using a known kit is able to interpret unambiguously.

This is because when solving specific geological problems improving the accuracy and precision of the result is determined by the comparability and aggregation of information. At the same time, the depth, resolution, and accuracy of the device depends on the distance between their elements, angles, and ratios between them, and whether these parameters are fundamental structural characteristics of geological objects and used electric fields. Pointed to by is to eliminate these disadvantages, as well as to create on the basis of the known devices standardized and unified measurement system, the complex electric probes.

Thus, the technical result expected from the use of the invention is to simplify the set and algorithm processing the measurement information while increasing its reliability, reproducibility and accuracy. In addition, the use of the kit will allow you to create a unified complexes for the study of geological objects at different levels of the hierarchy.

This result is achieved in that in a set of three-membered devices for prospecting, each of which contains two excitatory and two measuring electrodes, the distance between any pair of electrodes trinomial devices are members of a number of rules:

Lr= Lr-1+ Lr-2,

where r=3, 4 ..., L1=G-L2=2G

G - base line.

In addition, the choice of distances using the adjacent members of the series.

It is also useful to divide the set into multiple sets with the base member number of the form (1).

Thus, each device of the set measuring electrode and the distance between the exciting electrodes are members of the series (1).

The drawing schematically shows a ternary device for em.

The device includes electrodes 1, located at points A, B, M, N, and called in the future in accordance with these points, key 2, source 3 DC and a voltage meter 4.

The ratio of the distances MN/AM/AB is equal to the ratio Lm/Ln/Lk, m<n<k. For example, when G=1 m, MN, AM, and AB can be 1, 2, and 5 m, 3, 5 and 13 m, 5.8 and 34 m, etc.

When used in a set of multiple sets, you can take G1= 1 m, G2= 3 m, G3= 5 m

Devices that make up the kit, can run on AC or DC, and the electrodes M, N can be outside of the line segment AB.

Conducted comparative tests of sets of known and proposed probes for lateral logging sensing. In the known probes of size MN, AM, and AB was 0,1/0,4/2,0; 0,1/1,0/4,0; 0,5/2,0/8,0; 0,5/4,0/8,0; 1,0/8,0/16,0 m, and offer accordingly 0,28/0,42/4,76; 0,70/1,12/4,24; 1,82/2,94/12,46; 0,14/0,28/20,16; 0,42/0,70/20,16; 1,12/1,82/20,16 m

In working with probes and comparative tests have identified the following benefits of the proposed probes:

the set of probes is formalized, standardized,

- coefficientsa significantly, that allows to increase sensitivity by 30-40%,

- the same depth of research was achieved with the smaller sizes of the probe and, consequently, at lower current supply electrodes

for reliable detection of anomalies had to use a smaller number of probes.

1. Set trinomial devices for prospecting, each of which contains two excitatory and two measuring electrodes, characterized in that the distance between any pair of electrodes trinomial devices are members of several types:

LrLr-1+ Lr-2(I)

where r is 3,4. L1G; L22G;

G base number.

2. Kit p. 1, wherein selecting distances use the adjacent members of the series.

3. Kit p. 1, characterized in that it consists of several sets with bases that are members of a number of species (I).


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