A method for measuring resistivity of rock ore specimens

Abstract

Provided is a resistivity measurement method of a rock and ore specimen. One end of a resistance box is connected with one end of the rock and ore specimen, and a given voltage is applied between the other end of the resistance box and the other end of the rock and ore specimen. First, the resistance of the resistance box is adjusted to be a large value, the resistance box is ensured to be passed through a safe supply current even the resistivity of the rock and ore specimen is low under the given supply voltage, if the current passing through the resistance box is large, the resistance R1 of the resistance box is increased, then U1 and U2 are measured again, and R2 and the resistivity are calculated. According to the invention, direct measurement of the current is prevented, and high-precision measurement of the current is realized through measuring the voltage of a high-precision resistor loaded on the resistance box, hence the problem that the current is too large or too small to measure caused by the measurement current directly though an ammeter is prevented.

Description

technical field [0001] The invention relates to the field of geophysical exploration, in particular to a method for measuring the resistivity of rock ore samples. Background technique [0002] Electrical prospecting is the main geophysical method for solid mineral, geothermal, groundwater and oil and gas exploration. The resistivity of rock ore specimens provides necessary supporting data for electrical exploration design and electrical exploration data interpretation, and is a key parameter that must be used in electrical exploration. The resistivity measurement of rock ore specimens is a necessary step to obtain the resistivity of rock ore specimens. The accuracy of the measurement results is directly related to the effect of electrical exploration and the understanding and evaluation of rock physics. The traditional method for measuring the resistivity of rock ore specimens is directly based on Ohm's law. The specific procedure is as follows (see figure 1 ): [0003] ...

AI Technical Summary

Problems solved by technology

The defect of this measurement method is that when the resistivity of the rock ore specimen is extremely low, the current passing through the rock ore specimen is very large, which may cause the ammeter to saturate or burn out, so the rock ore specimen with extremely low resistivity cannot be measured

Another problem is that when the resistivity of the rock ore specimen is very high, the current passing through the rock ore specimen is very small, and the ammeter cannot measure the weak current, which leads to the inability to accurately measure the resistance of the sample.

Therefore, high-resistivity rock ore specimens cannot be measured with high accuracy by using existing devices, and sometimes even because the resistivity of rock ore specimens is too high to measure

The above-mentioned problems have greatly limited the measurement range of the resistivity of rock ore specimens, and neither rock ore specimens with low resistivity nor high resistivity rock ore specimens can achieve high-accuracy measurement

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