Seismometers

SE3NT 4D Microfracturing Monitoring System

( Overview

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With an array of highly sensitive 3-component geophones, our system can continuously monitor the microseismic signals with high precision, high sampling rate, wide signal band, and wide dynamic rang. All geophones are synchronized with GPS. Using Semblance scanning algorithm, the correlation factor of the signals from geophones array are used to determine the starting time and the spatial location of microseismic activity. By plotting a series of microseismic events in 3D, the development of the fracture can be reconstructed.

 
 

( Main Function

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Applications of SE3NT microseismic monitoring system include oil exploration, hydra-fracturing operation and natural disaster monitoring. The geophones are designed to endure outdoor environment for long term.

Each geophone has three high precision (24bit) velocity sensor and is able to sample the data up to 2kHz. The data are stored in onboard Micro SD card (4~64GB available). The operation routine can be manual and preset.

 
 

( Main Features

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1.Small size, light weight, very portable and endurable

2.Highly sensitive sensor, high precision ADC and wide bandwidth sampling

3.High precision GPS timing system

4.Highly sensitive three component receivers

Features of Microseismic Monitoring Technology
1. Semblance Method:

Extensive search in the dimensions of start time, wave speed and x, y, z location can be performed in the semblance method. Uncertainly in the wave propagation speed can be compensated. The whole progress is intelligent and automatic, manual detection of potential signal is not needed.

2. Easy setup on-site:

Only an array of geophones needs to be dropped in swallows holes in the area of interest. GPS signals are used to synchronize the operations of all geophones.

3. Fracture Visualization:

A series of microseismic events can be plotted in a timely fashion to reconstruct the development of the fracturing.

 
 

( Pictures

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( Technical Specifications

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1 Number of channels: 3
2 Bandwidth: 0~500Hz
3 Dynamic range: ≤142dB
4 A/D converter: △∑ 24bit
5 Sampling rate: 10, 20, 50, 100, 500, 1000 Hz
6 Sampling data length: >= 1GB/ch
7 Maximum input voltage: 10 V (G=1)
8 Preamplifier gain: G=1, 2, 4, 8, 16, 32, 64
9 Equivalent input noise: 31nV
10 Input resistance: 10Mohm
11 Built-in core processor: ARM-9
12 Built-in GPS: timing error 30 ns, positional accuracy 2.5 m, sensitivity -162 dB (operable in densely wooded areas)
13 Built-in wireless communication: 2.4 GHz, line of sight range 3.2 km, actual range in mountainous terrain 300 m (can select GPRS remote communication).
14 Memory: 4 - 16 GB SD card
15 Average power consumption: 140 mA operating, 30 mA standby
16 Battery: 7.2V/8.8Ah, 50 hours operating time or 300 hours standby
17 Size: 180 x 180 x 80 mm
18 Operating conditions: -20 to 85 degrees Celsius, rainproof
19 Geophone: 100V/m/s, 4.5Hz three component geophone
 
 

( Standard Software

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( Possible Extensions

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( Recommended Configuration

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