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Product Description
Best Borehole 3C Geophone for Seismic Surveys – Full Guide 2026
Are you searching for a high performance downhole seismic sensor? You have come to the right place. In this article we present the Borehole 3C Geophone in three series: GDJ-DJ (electromagnetic), GDJ-JG (piston type), and GDJ-JF (non adjacent). Keep reading to see why this tool dominates the market.
Why 3 Component Matters for Borehole Seismic
A single component geophone only records waves moving in one axis. That is not enough for modern imaging. Our three component borehole geophone records the full wavefield. You get P waves and S waves separated cleanly. This leads to better velocity models and more accurate subsurface maps.
Frequency Options from 4Hz to 100Hz
Different depths need different frequencies. Shallow high resolution work uses 100Hz. Deep basin studies use 4Hz. Our geophone lets you choose any frequency between 4Hz and 100Hz. Common choices are 4Hz, 10Hz, 30Hz, 40Hz, and 100Hz. No need to buy multiple tools.
Three Mechanical Series Explained
GDJ-DJ Electromagnetic Series – Uses magnetic force to attach to steel casing. Ideal for cased boreholes where other tools slip.
GDJ-JG Piston Type Series – A mechanical arm presses against the borehole wall. Works in open holes and rough surfaces.
GDJ-JF Non Adjacent Series – No contact with the wall. Best for soft formations or highly deviated wells where clamping is risky.
All three share the same frequency range and temperature rating. Choose based on your borehole condition.
Temperature and Diameter Specifications
The tool operates from 25C to 55C. That covers most sedimentary basins and hard rock mines. Diameter varies: 55mm (DJ), 50mm (JG), 45mm (JF). The 45mm model can pass through NQ drill rods (about 60mm inner diameter). Height varies from 300mm to 500mm. Shorter is better for deviated holes because it bends easier around corners.
Lightweight Design Saves Field Costs
Heavy tools require stronger winches and more crew members. Our lightest model (JF with 60m cable) weighs only 6kg. The heaviest (JG with 120m cable) is 17kg. Compare that to older borehole geophones that often exceed 25kg. You will reduce shipping costs and improve field safety.
Parameter Table – Quick Comparison
| Model | GDJ-DJ | GDJ-JG | GDJ-JF |
|---|---|---|---|
| Series Name | Electromagnetic Borehole Geophone | Piston Type Borehole Geophone | Non Adjacent Borehole Geophone |
| Frequency Range (Hz) | 4 to 100 Optional | 4 to 100 Optional | 4 to 100 Optional |
| Minimum Borehole Diameter (mm) | 70 | 50 | Not Required |
| Maximum Borehole Diameter (mm) | 120 | 110 | Not Applicable |
| Max Temperature (C) | 55 | 55 | 55 |
| Tool Outer Diameter (mm) | 55 | 50 | 45 |
| Tool Length (mm) | 465 | 500 | 300 |
| Weight 60m Cable (kg) | 10 | 12 | 6 |
| Weight 120m Cable (kg) | 14 | 17 | 10 |
Product Description
| Low-Frequency (vertical, horizontal and three-component ) Geophones | |||
| Parameter\type name | CDJ—Z2A/P2A/S2A | CDJ-Z2B/P2B/S2B | CDJ-Z2C/P2C/S2S |
| Natural Frequency (Hz) | 2±10% | ||
| Sensitivity G | 1.2±10% | 3.5±10%% | 2±10% |
| (v/cm.s-1) | |||
| Coil Resistance Rc(Ω) | 1600±5% | 13000±5% | 6040±5% |
| Internal Resistance | 1540±5% | 12800±5% | 5800±5% |
| （Ω） | |||
| Damping Coefficient Bt | 0.7±10% | ||
| Harmonic Distortion D | ≤ 0.2 | ||
| Insulating Resistance | ≥ 20 | ||
| Ri (MΩ) | |||
| Coil’S Maximum Displacement P-P(mm) | 3 | ||
| Suspension Mass( g ) | 60 | ||
| Working Temperature | —25 ～ ＋55 | ||
| （℃） | |||
| Geophone Element Weight (K g ) | 0.25 | ||
| Low-Frequency (vertical, horizontal and three-component ) Geophones | |||
| Parameter\type name | CDJ—Z2.5A/P2.5A/S2.5A | CDJ-Z2.5B/P2.5B/S2.5C | CDJ-Z2.5C/P2.5C/S2.5S |
| Natural Frequency (Hz) | 2.5±10% | ||
| Sensitivity G | 1.2±10% | 3.5±10% | 2±10% |
| (v/cm.s-1) | |||
| Coil Resistance Rc(Ω) | 1600±5% | 13000±5% | 6040±5% |
| Internal Resistance | 1540±5% | 12800±5% | 5650±5% |
| （Ω） | |||
| Damping Coefficient Bt | 0.7±10% | ||
| Harmonic Distortion D | ≤ 0.2 | ||
| Insulating Resistance | ≥ 20 | ||
| Ri (MΩ) | |||
| Coil’S Maximum Displacement P-P(mm) | 3 | ||
| Suspension Mass( g ) | 60 | ||
| Working Temperature | —25 ～ ＋55 | ||
| （℃） | |||
| Geophone Element Weight (K g ) | 0.25 | ||
| Low-Frequency (vertical, horizontal and three-component ) Geophones | |||
| Parameter\type name | CDJ—Z3A/P3A/S3A | CDJ-Z3B/P3B/S3B | CDJ-Z3C/P3C/S3S |
| Natural Frequency (Hz) | 3±10% | ||
| Sensitivity G | 1.2±10% | 3.5±10% | 3±10% |
| (v/cm.s-1) | |||
| Coil Resistance Rc(Ω) | 1600±5% | 13000±5% | 6040±5% |
| Internal Resistance | 1540±5% | 12800±5% | 5650±5% |
| （Ω） | |||
| Damping Coefficient Bt | 0.7±10% | ||
| Harmonic Distortion D | ≤ 0.2 | ||
| Insulating Resistance | ≥ 20 | ||
| Ri (MΩ) | |||
| Coil’S Maximum Displacement P-P(mm) | 3 | ||
| Suspension Mass( g ) | 60 | ||
| Working Temperature | —25 ～ ＋55 | ||
| （℃） | |||
| Geophone Element Weight (K g ) | 0.25 | ||
