SY/T 10017-1998 Technical specification for submarine cable seismic data acquisition
Some standard content:
Ics 75.020
Registration No.: 19891998
People's Republic of China Offshore Oil and Gas Industry Standard SY/T10017—1998
Technical Specifications for Occan Bottom Cable Seismic Data Acquisition Acquisition1998-07-20Release
China National Offshore Oil Corporation
1999-03-01Implementation
SY/T10017—1998
1Scope
2Definition of terms
3Preparation before operation
4Construction technical requirements
5Product evaluation
Appendix A (Standard Appendix)
Appendix B (Suggestive Appendix)
Appendix C (Suggestive Appendix)
Source gun shut-off standard
" The content of "Instrument Recording Class Report"...·
The content of "Submarine Cable Construction Operation Report"
SY/T10017—1998
With the introduction and application of submarine cable seismic acquisition technology in our country, it is of great guiding significance to formulate a technical regulation applicable to the submarine cable seismic acquisition system. The characteristic of the submarine cable seismic acquisition system is that the submarine cable (external detector) is placed on the seabed to replace the towed cable of deep-sea ground bombardment operation and the telemetry acquisition station of shallow-sea ground installation operation to carry out seismic operations. This standard is compiled according to the field characteristics of the submarine cable seismic acquisition system.
The preparation of this standard refers to a large number of international operation data and domestic original relevant standards, and also draws on the construction experience and test results accumulated in my country's marine seismic operations over the past few years. The technical requirements of the submarine cable source system are basically the same as those of the cable source system. This standard does not involve this standard. This standard has been implemented since March 1, 1999; since March 1, 1999, all submarine cable ground data collection operations have been in compliance with the provisions of this standard:
Appendix A of this standard It is the appendix of the standard. The appendix and acknowledgments of this standard are the indicative appendices. This standard was proposed and managed by China National Offshore Oil Corporation. The drafting unit of this standard: China National Offshore Oil Geophysical Exploration Company: The main drafters of this standard: Jiang Ruilin, Yang Kai, You Wanyi, Zhang Xiaohong: The chief reviewer of this standard is An Youli.
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Technical Specifications for OceanBottom Cable Seismic Data Acquisition Technical Specifications for OceanBottom Cable Seismic Data Acquisition This standard specifies the technical requirements and quality control indicators for submarine cable seismic data acquisition. This standard applies to submarine cable seismic data acquisition operations. 2 Definition of terms
2.1 Abnormal channel
An abnormal channel is one that falls into any of the following situations: a) a non-working channel or an intermittent working channel; b) a strange jumping channel with noise greater than 1.0Pa (10μbar); c) a polarity reversal channel; d) a channel with an average amplitude that decreases by more than 6dB compared with the adjacent channel. 2.2 Empty and waste shots
A shot is empty or waste if it falls into one of the following situations:a) No valid data is recorded
No explosion signal:
Gun self-excited;
The source synchronization error exceeds ±1ms:
e) There is an inductive record;
f) The tape reel number and survey line number do not match the class report and cannot be verified. 2.3 Exceeding limit point
SY/T10017-1998
It is the difference between the actual point and the theoretical design point. The smaller hand soil is 3m along the survey line direction and the vertical survey line direction is less than 8m3 of soil. Preparation before operation
3.1 Preparation of data
3.1.1 Feasibility study report of seismic acquisition project and report on acquisition parameters and construction plan demonstration 3.1.2 Construction design drawings and coordinate data drawn before construction design. 3.1.3 Ellipsoid and projection parameters
3.1.4 Data on weather, ocean currents, topography and geomorphic features in the T. area, as well as fishery activities3.1.5 Various necessary and valid ship navigation documents, safety, health and environmental protection documents, operating permits, personnel deployment and job certificates. 3.2 Preparation and basic requirements of equipment and spare parts3.2.1 Recording instruments (seismic instruments, tape recorders, copiers), complete monthly inspections and keep records3.2.2 Gyrocompasses, depth sounders, multi-ship synchronous controllers, multi-channel monitors, various printers and plotters should be in good condition. Approved by China National Offshore Oil Corporation on July 20, 1998, implemented on March 1, 1999
SY/r10017-1998
3.2.3 Cables (sub-sections, jumper wires, detectors) shall be configured according to the required quantity, and 50% of the spare quantity shall be reserved: 3.2.4, the source system shall be complete (compressor, cable winch, torch cable, gun, controller), and the spare parts shall meet the operation requirements 3.2.5 The on-site quality control and processing system shall meet the operation requirements, 3.2.6 The navigation and positioning equipment shall meet the operation requirements 3.2.7 The measuring instruments used in the instrument and ship shall have qualified certificates. 3.2.8 Communication equipment (satellite telephone, fax, data transmission equipment and radio station) shall be configured according to the operation requirements, 3.2.9 The offshore supply and desalination equipment shall meet the operation requirements. 3.2.10 The performance of the expansion vessel should meet the operational requirements (registered speed greater than 10kn and endurance greater than 30d), and have qualified communication equipment for contacting the mother ship and various valid certificates.
4 Construction technical requirements
4.1 Operation is not allowed to start
Operation is not allowed to start when any of the following problems exist: 2) Any item of the instrument H inspection is unqualified or the instrument monthly inspection is not carried out within the deadline; b) The inspection is unqualified;
c) One of the following auxiliary equipment is abnormal:
1) Magnetic backing machine, disk drive;
2) Control terminal;
3) Multi-channel monitor;
4) Depth sounder;
5) Various printing equipment and drawing equipment;
6) Gun synchronization system display device;
7) Multi-ship synchronization controller;
8) Positioning and navigation system;
9) Acoustic secondary positioning system.
d) Before the cable is launched into the water, it fails to meet 100% of the test results; after the cable is launched into the water, the normal working channel exceeds 2 or the cumulative adjacent working channel exceeds 0.5Pa (5μlar); the near-ship channel exceeds 0.7Pa (7ubar); f) The working pressure of the air gun is lower than 95% of the rated pressure; the gun discharge depth error exceeds 1m:
h) Turn off the gun that does not meet the gun shutdown standard (see Appendix A); i) Any of the main and auxiliary navigation systems is abnormal; ) When the one-time positioning data of the bottom cable release appears in the following situations: 1) There is no real-time positioning data;
2) There is no positioning data at the starting and end points of the cable;
3) There are more than three consecutive points without positioning data in the middle of the cable. 4.2 Not allowed to continue the operation
If any of the following problems exist, the operation is not allowed to continue: a) The recorder fails;
b) The cable noise exceeds 0.7Pe (7mbar); e) The abnormal cable channel is more than % of the recorded value or two adjacent channels are missed; d) The operation of various auxiliary equipment in 4.1e)3)5) exceeds the normal time for more than 30min; e) The air gun force is lower than 90% of the rated pressure for 10 consecutive shots; 2bZxz.net
f) The gun that does not meet the gun shutdown standard is turned off; 5 empty or waste shots appear in succession;
SY/T 10017-1998
The main navigation system fails, and the auxiliary navigation system cannot replace it: h)
There are 5 consecutive points without positioning data or positioning deviation in the survey line; i
j) There is no water depth data for 5 consecutive points;
k) The acoustic positioning system has no data for 5 consecutive shots; 1) The field processing system fails for 72 consecutive hours, 4.3 Others
In addition to the above requirements, the following information should also be noted:
a) Play back one monitoring record every 20 shots;
At least one single-channel profile of the common center point (CMP) survey line should be drawn after each beam line is completed; h)
c) In the seismic monitoring record, the time difference of the first arrival waves of adjacent channels does not exceed 1 of the time difference between the channels; d) During the operation, the government uses the acoustic wave and first arrival wave method to perform secondary positioning of the underwater cable, 5 Product evaluation
It is considered as scrap if any of the following conditions exists| |tt||a) In one-dimensional operation, if the empty and missed blasting rate of the survey line is greater than 5%, the survey line record is scrapped. If the empty and missed blasting rate of the entire operation is less than 3%, the record produced by this operation is scrapped.
b) In the work area with a water depth of more than 5m, the sonic secondary positioning recovery rate is less than 60% and there are more than 12 consecutive invalid points. The survey line record is scrapped.
e) In one-dimensional operation, if the single positioning over-limit points and the points without positioning data accumulate to the total measurement 10% of the points, the record of this survey line is scrapped; d) The points without water depth data exceed 10% of the total points of the survey line, the record of this survey line is scrapped 3
Applicable to the seismic source composed of multiple guns
SY/T10017-1998
Appendix A
(Standard Appendix)
Seismic source gun shutdown standard
A1 After shutting down a broken gun, it is only allowed to be replaced by a spare gun with the same capacity in the array. A2 After shutting down one or several guns, the peak-to-peak value (Pi-Pi) is not allowed to be less than 85% of the rated capacity peak-to-peak value (Po-Po). A3 After shutting down one or several guns, the bubble ratio (Pi/Bi) is not allowed to be less than 85% of the rated capacity bubble ratio (Po/Bo). A4 The correlation coefficient between the spectrum after shutting down the gun and the spectrum of the original array is greater than 0.98. S
Submarine cable seismic acquisition instrument parameter table
SY/T10017-1998
Appendix B
(Suggested appendix)
Contents of "Instrument Record Class Report"
Table B1 gives the format, content and requirements of the submarine cable ground capsule acquisition instrument parameter table. Table B1 Submarine cable seismic acquisition instrument parameter tableMarine Survey Ceneral InfarmationOperating company:
Client:
Aren:
Seismic recording instrumentSeisme InstrumentsInstrumentModel
Instrument delayInstrurient Delay
PreAmplifierGainPreAmplifierGain
Low cut filterLoweutFilter
Low cut filter steepnessSlopeof LownH
HighcutFilter
SlopeofFiter
RecordLongth
SamplingIntervalSermple:Ralc
RecordFormatFomat
TapeDensity
HydrophoneType
Remarks
Operaton
ADR
Vessel
ReceiveLine
SeismicSysten
SourceModel
SourceTimeDelay5
TotalAirgunCapacity
arceTimeelay
TotalAirgun Volumn
Maximum Pressure Max: AirgunPress:
Total Airguns
Used Airgun
ShotsInterval
ShotLine'sSpaces
GunDepth
POB:
Party Chief
ShotLine:
Seq.No:
Groemetry
ReceiveLineNo
Total Channels
Usxd Chands
ReceiveTraces
AuxiliaryChanne's
Channel Skills
race Interval
Minimum longitudinal offset Min.Offset inLineMinimum longitudinal displacement MaxOffset in LineMinimum transverse displacement
Min. Offset in Cross.
Maximum transverse offset Max: OffsutinCruxsInstrument Engineer
Engineer
B2Submarine cable seismic acquisition record shift report
SY/T10017—1998
Table H2 gives the format, content and requirements of the submarine cable seismic acquisition record shift report. Table B2 Submarine cable seismic acquisition log report—Operators Log
Zone II:
Fite No
Firet
Receive Line No:
Receive Line No
Reel No:
Shot I.ine Nh
Gun point station number
Shnt's GfS
Smoke direction:
Arrangement station number
Sipread Cifs
阝期:
Gun point situation
First gun point
Eyebrow gun point Rear gun line avoids front gun tail road tail gun First road tail gun tail road Shol Contditkn
Exploration operator:
Fprratnr
Instrument engineer:
Engineer
Sea state:
SegState
Inspection point
Situation notes
Hydrophone
Cxnditioay
B3 Submarine cable land acquisition record class report 2SY/T 10017—1998
Table B3 gives the format, content and requirements of the submarine cable seismic acquisition record report 2Table R3 Submarine cable seismic acquisition record report 2Orn:raitors Iaog
AreaAree:
Line No
Line No
Operation DescriptionCcornment:
Direction (\)
Direction
Operator:
Operator
Date:
Starting Shot No
Bagin Shot No
End Shot No
End Shot Ne
Sea Sinking
Total Shots
Total Shots
Remarks
Instrument Engineer:
Engineer
C1 Work Content
Overview of Work Area
SY/T10017-1998
Appendix C
(Reminder Appendix)
Contents of "Submarine Cable Construction Operation Report" Work area location, sea conditions, weather, adjacent ports, fishing activities, etc., with work area location map, construction design survey line grid map, positioning shore station distribution map, and tidal change table of the work area. C3 Equipment Overview
Operation status of each professional equipment, what faults occurred during the operation, and what checks and adjustments have been performed (such as: calibration of the locator). C4 Operation parameters of various professional equipment during construction C4.1 Instrument parameters
Instrument model, sampling rate, recording format, filtering characteristics, recording length, number of channels used, recording density, C4.2 Positioning and navigation parameters
Name and model of the main and auxiliary navigation systems, shore station layout diagram and shipboard antenna layout geometry and dimensions, layout diagram and dimensions of sensors of various underwater positioning systems (including RGPS, laser, acoustics, etc.). C4.3 Source parameters
Total volume of the array combination, working pressure, sinking depth, and attached array combination layout diagram and source sub-wave and spectrum diagram. Quality analysis and problems
Attached with time-effectiveness analysis statistics
Attached with operation quality statistics and seismic operation daily report Attached with a list of the main construction crew members and on-board representatives C8
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