JDX-2Dr Electrical Resistivity Probe | Geotech Instrument Co., Ltd.

PRODUCT PARAMETERS

The probe digitizes the measured formation information and transmits it to the surface in encoding, avoiding the influence of cables on the measured data.
Constant power and adaptive measurement, no manual operation is required.

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Description

FAQ

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Description

Abstract

JDX-2Dr Electrical Resistivity Probe is a classic combination probe that can measure parameters such as gradient resistivity, potential resistivity and natural potential through different electrode layout methods. Through interpretation, information such as formation permeability, porosity, water quality, and formation interface can be obtained.

Applicable Conditions

● Bare hole

● Fill with water or mud

Applications

● Pumping test calculation

● Identify aquifer locations

● Verify penetration zone

● Casing Leak Detection

Features

● The probe digitizes the measured formation information and transmits it to the surface in encoding, avoiding the influence of cables on the measured data.

● Constant power and adaptive measurement, no manual operation is required.

Specifications

Instrument power supply	DC 200V ± 20%, current ≤ 40mA
Electrode arrangement	N 0,6 M21,3 M10,3A
Natural gamma detector	Nal crystal
Measuring range	Apparent resistivity: 1~4000Ωm (customized up to 10000Ωm) Natural potential: ±1200m V Natural gamma: 0~32768cps
Measurement accuracy	2% (10~4000Ωm) or ±1Ωm
Signal output	Bipolar encoding

FAQ

In gravity exploration (SI), what is the unit of gravity? How to convert gravity units between SI and CGS?

What are gravitational field and gravitational potential?

What is the normal gravity field of the earth? What are the rules for the change of the normal gravity field with latitude and altitude?

① The normal gravity field of the earth: Assuming that the earth is a rotating ellipsoid (reference plane), the surface is glossy, the internal density is uniform, or it is distributed in concentric layers, the density of each layer is uniform, and the deviation of the shape of the ellipsoid from the geoid is very small, then the gravity field generated by the earth is the normal gravity field.
② The normal gravity value is only related to the latitude, the smallest at the equator and the largest at the poles, with a difference of about 50,000 g.u.; the rate of change of the normal gravity value with latitude is the largest at 45° latitude, and zero at the equator and the poles; the normal gravity value decreases with increasing altitude, and its rate of change is -3.086 g.u.. The main feature of the long-term change is the "westward drift" of the geomagnetic elements, both the dipole field and the non-dipole field drift westward, and have a global nature.

What is the relationship between gravitational field strength and gravitational acceleration?

What is gravity exploration?