Marine Technical Center

The Marine Technical Center (MTC) company effects the sale and delivery of the Russian state-of-the-art CRAB Ocean Bottom Seismic System. MTC performs furnishing, packaging, delivery and installation as well as warranty maintenance and after sales support of the System.

CRAB System

Mobile seismic system for marine surveys and monitoring on the shelf and in transition zones.

The system based on 4C Ocean Bottom Nodes which are controlled by the system’s lab containers.

Designed for offshore seismic exploration and regional studies.

CRAB Composition

Ocean Bottom Nodes

Ocean Bottom Node - operation in any orientation

Operation in any orientation at the seabed

Ocean Bottom Node - autonomous operation during 45 days

Autonomous operation during 45 days

Ocean Bottom Node - battery recharging time

Battery recharging time is 24 hours

Ocean Bottom Nodes - CRAB
Ocean Bottom Node - diameter

Diameter 245 mm

Ocean Bottom Node - height

Height 132 mm

Ocean Bottom Node - weight

Weight in air 12 kg

Lab container

Purpose

  • Charging batteries of the Ocean Bottom Nodes
  • Controlling the Ocean Bottom Nodes
  • Downloading recorded data from the Ocean Bottom Nodes
Lab container - CRAB

Specifications

  • Up to 400 Ocean Bottom Nodes
  • Can be powered by different supply source (220V, 380V, 440V)

CRAB System Features

CRAB Ocean Bottom Seismic System - operated onshore or at depth

Can be operated onshore
or at depth up to 500 meters

CRAB Ocean Bottom Seismic System - Repreparation time is 24 hours max

Repreparation time
is 24 hours max.

CRAB Ocean Bottom Seismic System - Operating temperature from -10° to +50° C

Operating temperature
from -10° to +50° C

CRAB System Applicability

Regional Studies

The object of regional studies is a large geological structures (both lateral and deep scale). The purpose of these works is to study the structure of the sedimentary cover and consolidated crust.

CRAB System Applicability - Regional Studies

Hydrocarbon exploration

Hydrocarbon exploration is aimed at a geological structures of sedimentary cover detailed study. The purpose of these works is detailed study of the explored area with the allocation of small-scale structural elements and hydrocarbon deposits.

CRAB System Applicability - Hydrocarbon exploration

CRAB Specifications

Ocean Bottom Nodes

Electric technical specifications

Recorder
4 channels
Orthogonal oriented Geophones BH-20MT OMNI
Hydrophone
ADC
24 bit, delta-sigma with sample interval 0.25, 0.5, 1, 2, 4 ms
Gain
0, 6, 12, 18, 24, 30, 36 dB
Max input signal
1.8 V (rms)
Equivalent input noise
0.08 – 3 μV (rms)
Gain accuracy
≤ 1%
Instant dynamic range
126 dB at 0 dB gain
Flash memory
32 GB
Power autonomy
45 days

Geophone electric technical specifications

Natural frequency
20 Hz
Distortion (in any orientation)
< 0.5%
Coil resistance
2720 Ω
Open loop sensitivity
28 V/m/s
Sensitivity at 70% Damping
15 V/m/s
Damping
0.7

Hydrophone electric technical specifications

Capacity
(at temperature 25°C, pressure 1 atm)
≥ 2250pF
Sensitivity
25 V/Bar

CRAB System Manufacturing

Contacts

Marine Technical Center Limited Liability Company

+7 921 788-58-56

Marshala Govorova st., 29 litera O,
space 8-H, office 1,
St. Petersburg, Russia, 198095

info@mtcgeo.com​