Equipment:

The seismic equipment is used by YMG for offshore exploration of hydrocarbons site surveys and helps YMG find the best solutions with optimum performance.

Recording equipment


ARAM ARIES II recording System (Canada)

The system designed to carry out 2D-3D seismic surveys and has a modular structure, i.e. consists of a central station and a set of independent and interchangeable RAM field modules. Each module is connected to a seismic cable, which contains 8 seismic channels. DT-25-11A hydrophones (depth from 1m) and SVG-6 geophones (depth up to 1m and on land) used as sensors. Information from seismic channels transmits by cable to a central recording station (CRS) and records on an electronic storage in the required format. Basic mode of the system operations is the real-time telemetry, i.e. information is transmitted to a central station immediately after each shot.

ARAM ARIES II» field equipment
Remote data collection module (RAM) 200 pcs.
Communication module (TAP) 10 pcs.
Marine cases for modules 200 pcs.
Seismic cable 200 pcs.
Rechargeable lithium-ion battery 210 pcs.
Battery Charger 2 pcs.
Manual tester for remote RAM module 5 pcs.
DT-25-11A hydrophone 1600 pcs.

Principle layout scheme of ARAM ARIES II recording equipment

Remote Acquisition Module, RAM, used to gather seismic data in analog form from seismic receivers with subsequent digitization and transfer to the Seismic Processing Module, SPM.

The main parameters of Remote data acquisition modules (RAM)
ADC Resolution 24 bit (23 plus a sign)
Number of traces on RAM field module 8 seismic channels
Sample interval ¼, ½, 1, 2, 3, 4 ms
Cross impact >130 (with discretization interval 2 ms and 25 °С)
Harmonic distortion 0,0002 %
Preamplification 12, 24 and 30 dB
Equivalent input noise <61 mkV RMS with a coefficient of 12 dB
Frequency response from 3 to 1640 Hz
Full-scale input 0,944 В RMS @ 12 dB preamplification,
0,214 В RMS @ 24 dB preamplification,
0,122 В RMS @ 30 dB preamplification
Dynamic range 135 dB
Time standard ±2,5 ppm from −45 °С to 70 °С
Channel similarity more than 1%
Operating voltage 18÷30 V
Common mode suppression >105 dB
Input impedance 20 ohm (differential)
Anti-alias filter

Digital filter with a linear phase characteristic.

For a sampling interval of 2 ms:
f0 (cutoff frequency, point - 3 dB) = 0,82fN = 205,9 Hz

Operating temperature range from −45°C to +70°C

 

TAP communication module interconnects base lines and broadcasts data from RAM modules to a data processing module.
Maximum length of the receiver line - 132 km (2400 channels with 55m spacing, with a sample interval of 2 ms), for interline cable - 6000 channels.
The maximum distance between RAM modules - 656 m.
TAP interconnection module with built-in RAM provides interline connection of receiver lines.

Each receiver line requires one TAP module. TAP modules connect by a cable, which connect to a seismic station.

Lithium ion battery specifications: 

voltage 24 В DC
capacity 14 Ah
utilization time 120 hours at 20° С
charging time 4 hours using a SMART Charger
weight 4,54 kg
Marine case
weight 16 kg with RAM and lithium ion battery
Operating depth Up to 75 m
Cable
Tensile strenght up to 727 kg
Cable braid double, completely waterproof
weight 17,5 kg / 100 m

 

Charge of lithium ion batteries 

Characteristics of DT-25-11A hydrophones
Natural frequency 10 Hz
Response 11,2 V/bar
Resistance 160 ohm
Impedance 250 ohm
Operating temperature 0 ÷ +35 °С
Working depth < 80 m
Length 12,4 cm
Diameter 5,3 cm
Weight 400 g

 

Main characteristics of the central recording system

 ARAM ARIES II Recording equipment


«BOX» radio telemetric system

General characteristics:

Specifications:

 

Recording system is placed in a mobile container (van)

Control console

 


Marsh Line

Manuactured by SI Technology (Russia).

Digital telemetric system based on a rigid cable with built-in sensors (geophones and hydrophone receivers) and field electronics. The system is designed for work in offshore areas, in transition zones and adjacent land areas.

System Marsh Line is used for:


INTROMARIN-L2 Seismic acquisition and recording system

Manufactured by SI Technology (Gelendzhik, Russia)

Specifications:
Quantity of active channels 248
Used 496
Auxiliary 8
Operating system Windows NT
Analog-digital converter 24 bits
Sampling period 0,5, 1, 2 or 4 msec
Max recording time 32 sec @ 1 msec
Pre-amplifier gain 12, 24, 36 or 48 dB
Max input signal from 25 to 1600 mV — depending on the gain
Dynamic range 114 dB
Channel cross-talk coefficient > 90 dB
Band from 3 to 750 Hz
Input impedance (differential input) 20 kOhm
Input impedance (common-mode input) 100 kOhm

Physical specifications

Size 550×580×430 mm
Weight of 120-channeled modification 38 kilos
Power 130 W
Electric power supply: voltage DC 12±20% Volt or 24±20% Volt

 


ССТ-480/960 Telemetric cable & modular system for seismic exploration

Manufactured by JSC YUZHMORGEOLOGIYA.

The central station based on IBM PC Pentium II-300 controls digital modules and the system, seismic data recording and acquisition.

One ССТ section 300 meters long is equipped with one or two digital telemetric modules.

Digital telemetric module (DTM) (basic) provides analogue seismic data recording, gain, analog to digital conversion and transmission to the control console.

 


UPCM-120х4 Multi component digital receiver

Manufactured by JSC YUZHMORGEOLOGIYA in 2002–2004.

Application:

Composition:


Emitting equipment and seismic complexes

 “SPARKER” electric spark source

Frequency response 100-800 Hz
Emission energy < 2-2,5 kJ {{{1}}}
Emission interval < 1 sec

AP-4 acoustic profiler

Main specifications:
Operating frequency 3,8 kHz
Depth of cross section 10-30 m
Resolution 35 cm
Duration of sounding impulse 1/1,5 of actual frequency period
Emission period 100-1000 ms
Digital registration SEG-Y (8/16 bit, 1024/2048 samples)

Digital input (RS-232)

NMEA-0183, external marks
Analog recording any analog thermal printer
Installation Onboard, bar-mounted