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JDX-2Dr Electrical Resistivity Probe
PRODUCT PARAMETERS
Description
Abstract
AbstractJDX-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?
① In SI, it is m·s-2, and one percent of it is the international unit abbreviation g.u.;
② Conversion between SI and CGS: 1g.u.=10-1 mGal
What are gravitational field and gravitational potential?
Gravitational field: The space around the earth with gravity is called the gravitational field.
Gravitational potential: The gravitational potential W in the gravitational field is equal to the work done by a particle of unit mass moving from infinity to that point.
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?
The gravitational field strength is equal to the gravitational acceleration in both numerical and dimensional terms, and the two are in the same direction. In gravity exploration, all references to gravity refer to gravitational acceleration. The gravitational field strength at a point in space is equal to the gravitational acceleration at that point.
What is gravity exploration?
Gravity exploration is an exploration method that is based on the density difference of rocks and ores. Since density difference will cause local changes in the normal gravity field of the earth (i.e. gravity anomaly), it is used to solve geological problems by observing and studying gravity anomalies.
