SY/T 10015-1998 Technical specification for offshore towed 2D seismic data acquisition
Some standard content:
ICS75.020
Registration No.: 1987—1998
People's Republic of China Offshore Oil and Gas Industry Standard SY/T10015—1998
Offshore Towing 2D Seismic
Technical Spexifications for Marine Towing2-D Seismic Data Acquisition1998-07-20 Issued
1999-03-01 Implementation
China National Offshore Oil Corporation
Published
$Y/T 10015—1998
1 Scope
2 Definition of terms
3 Preparation before operation
4 Technical requirements for construction
5 Product evaluation
Appendix A (Appendix to the standard)
Appendix B (Appendix to the standard)
Seismic source gun standard
“Construction report\Contents
Appendix ((Suggested appendix)“Seismic class report” Contents
SY711015:1998
In recent years, due to the upgrading of equipment, The operation methods have developed rapidly, and the technical requirements have changed greatly in breadth and depth. The original SY5295-1991 "Technical Regulations for Deepwater Petroleum Seismic Data Collection" and Q/CXXGiC.T10L.02-1995 "Technical Standards for Deepwater Seismic Data Collection" can no longer fully meet the operation needs. Therefore, this standard is specially formulated to standardize the technical management of field operations. Compared with the original standard, the main technical indicators that are not added and modified are as follows: a) The introduction of the source gun standard, the improvement of working pressure, the increase of synchronization indicators and the increase of monitoring equipment: h) Requirements for the wing angle of the depth controller (island) in cable balancing: c) Requirements for on-site quality control and processing systems; l) Equipment and technical requirements for safety, communications, escort ships, etc. This standard will be implemented from March 1, 1999. From March 1, 1999, all offshore towed 2D seismic data acquisition operations must comply with the provisions of this standard:
Appendix A and Appendix B of this standard are both appendices to the standard: and the appendix of the standard (which is the appendix of the standard, is managed by China National Offshore Oil Corporation, and the drafting unit of this standard is China National Offshore Oil Corporation. Company. The main drafters of this standard: Xu Guangzhou, Cao Zhanquan, Yang Siqin, Bu Qiqun. The person in charge of this standard 1: Tu Yunfeng.
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Offshore Oil and Gas Industry Standard of the People's Republic of China Technical Specifications for Marine Towing 2-D Seismic Data Acquisition1Scope
SY/T10015—1998
This standard specifies the general requirements for parameters and quality control technical indicators of towed 2-D seismic data acquisition operations. This standard applies to the implementation of offshore towed 2-D seismic data acquisition operations. It can be used as a reference for high-resolution 2-D seismic data acquisition operations.
2 Definition of terms
2.1 Feather angle
The angle between the average azimuth of the cable (or the azimuth of the tail mark) and the azimuth of the designed survey line. 2.2 Abnormal channel
Any channel that falls into any of the following conditions is an abnormal channel: a) A non-working channel or an intermittent working channel;
A channel with strange jumps and noise greater than 1.0Pa (10bar); b)
A channel with polarity reversal;
d) A leakage or insulation resistance less than 1.0M2:
The average amplitude is compared with the adjacent channel, and the decrease is more than 6dB. c
2.3 Empty and waste guns
The following situations are: empty and waste guns
No valid data recorded;
No explosion signal;
The gun is self-excited;
The source synchronization error is greater than ±1ms;
The tape reel number or survey line number does not match the class report and cannot be verified; e
There are records of induction;
No positioning data or unqualified positioning data 3 Preparation before operation
3.1 Preparation of data
3.1.1 Feasibility study report of seismic acquisition project and acquisition parameters and construction plan demonstration report. 3.1.2 Construction design drawings.
3.1.3 Ellipsoid and projection parameters.
3.1.4 Pre-survey line drawing and data table.
3.1.5 Weather, topography and current characteristics of the work area and fishing activities, etc. Approved by China National Offshore Oil Corporation on July 20, 1998 and implemented on March 1, 1999
SY/T 10015-1998
3.1.6 Various necessary and valid ship navigation certificates, safety, health and environmental certificates, operation license, personnel allocation and post certificates3.2 Preparation and basic requirements of equipment and spare parts3.2.1 Recording instruments (seismic instruments, tape recorders and copiers) should complete monthly inspections and keep records3.2.2 Gyrocompass, depth sounder, multi-channel monitor and various printers should meet the needs of the operation.3.2.3 Cable configuration (leading section, elastic section, working section, digital package, compass/depth sensor and tail mark positioning system RCPS) should be configured according to the requirements of the operation, and there should be 50% spare capacity.
3.2.4 The seismic source (aircraft, gun cable winch, cable, air gun and controller) shall meet the operational requirements. There shall be sufficient spare parts for air guns. 3.2.5 The on-site quality excavation and processing system shall meet the operational requirements. 3.2.6 The primary and auxiliary positioning and navigation systems shall be able to meet the operational needs and be able to operate normally online with the integrated navigation system. 3.2.7 The instruments and measuring devices used on ships shall have qualified certificates. 3.2.8 Communication equipment (satellite telephone, fax, data transmission equipment and radio stations) shall be configured according to the operational requirements. 3.2.9 The marine replenishment and micro-control equipment meet the operational requirements. 3.2.10 The escort ship's performance meets the operational requirements (ship speed greater than 10kn, endurance greater than 30d and wind and wave resistance greater than level 8), and has standard communication equipment with the mother ship and various valid certificates: 3.3 Cable balance
3.3.1 The cable depth controller (bird) wing angle is within +3\: The front island of the cable and the two birds at the rear can be within ±5°: 3.3.2 Obtain auxiliary parameters (water level, minimum offset, etc.). 4 Technical requirements for construction
4.1 Start of operation is not allowed
When any of the following problems exist, the operation is not allowed to start: a) Any item in the monthly inspection of the instrument does not meet the factory standard or the monthly inspection of the instrument is not done within the deadline; b) The instrument inspection is unqualified:
c) One of the following auxiliary equipment is not normal:
1) Tape drive, disk drive;
2) Control terminal;
3) Multi-channel monitor;
4) Depth sounder;
5) Various printing and drawing equipment;
6) Gun-to-gun system display device;
7) Cable underwater status display device.
The cable is working normally under the condition of the cable washing depth deviation is greater than ±1m:
c) The noise level exceeds the following indicators:
Under the premise of the production filter file, its root mean square value exceeds .51a (5pbar), and the depth of the cable is higher than 0.8 Pa (8 bar) in the 6 channels at the front and 3 channels at the rear of the cable.
g) The cable is still not pulled 1kim before the measuring line:
h) The distance between the set depth sensors exceeds 300)m, or the distance between two adjacent depth sensors that are working at full capacity exceeds 600m; i) There are less than 1 normal working water section;
) The operating pressure of the air gun is lower than 95% of the rated force; k) Any gun is self-excited;
1) The gun sinking depth error exceeds +1m;
The step error of the gun system exceeds ±1m1s;
SY/T 100151998
n) The gun that does not meet the standard of gun closing (see the standard of gun closing of A source); o) Any abnormality in the main navigation system 4.2 Requirements for not allowing continued operation
When the following problems exist, the operation is not allowed to continue: a) The recording instrument fails;
b) The cable noise exceeds the provisions in 4.1; the number of abnormal cable channels exceeds 4% of the total number of channels or exceeds 2 adjacent channels; d) The various auxiliary equipment in 3) to 5) in 4.1c) is out of service for more than 60mi during operation. tt; In the absence of a cable compass, no tail mark reflection is observed for more than 30 minutes; e
f) Meets the situation k) in 4.1;
Meets the situation n) in 4.1;
h) The air gun pressure is lower than 90% of the rated pressure for 10 consecutive minutes; i) 10 consecutive empty and waste shots;
j) 20 of the 100 consecutive shots are empty and waste shots; k) The cable feather angle exceeds 10 degrees:
1) The lateral deviation of the center point (CM\) of the whole mark from the survey line exceeds 20mm) on the navigation system Failure and the auxiliary navigation system cannot replace it: n) On-site handling system failure exceeds 72 hours. 4.3 Others
In addition to the above requirements, it should also be noted that:
New tapes should be used during production and the tapes should be cleared; a
b) When starting work on a survey line, if the gun is stopped for some reason before 5km, the work should be restarted from the beginning; When the work is stopped and resumed in the middle of a survey line, the work should be carried out in the original direction and repeated for no less than half the length of the array. A monitoring record should be placed every 40 guns for each source; d
) After each survey line is completed, each source should draw a Single channel agent surface, 5 product evaluation
Any of the following conditions is considered as waste:
a) Any measurement, waste rate is greater than 5% and recorded as waste; b)
The whole operation is empty, the waste rate is greater than 3%, this operation is recorded as waste. Applicable to the source composed of multiple guns
SY/T10015-1998
Appendix A
(Standard Appendix)
Source gun shutdown standard
After shutting down a broken gun, it is only allowed to be replaced by a spare gun with the same capacity in the array. A1
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 the gun is turned off and the spectrum of the original array is greater than 0.98. D
B1 Operation content
B2 Overview of the work area
SY/T10015—1998
Appendix B
(Appendix to the standard)
Contents of the "Operation Construction Report"
Work area location, sea conditions, weather, adjacent ports, fishing activities, etc., and attached with the work area location map, construction design survey line grid map, positioning shore station distribution map, and tidal change table of the work areaB3 Equipment profile
Operation status of each professional equipment, what faults occurred during the operation, what calibration and adjustment have been performed (such as calibration of the locator, cable balance, compass bird calibration, depth sensor calibration, calibration and adjustment of the air gun controller, etc.). B4 Operation parameters of various professional equipment in constructionB4.1 Instrument parameters
Instrument model, sampling rate, recording format, filtering characteristics, recording length, number of channels used, and recording density. B4.2 Cable parameters
Number of tracks, track spacing, offset distance, track number near the shot point, sinking depth, total length, number of installed depth gauges, water cut-off tracks, compass birds, and cable plan layout.
B4.3 Positioning and navigation parameters
Name, model, shore station layout diagram of the main and auxiliary navigation systems, and geometric figures and sizes of the antenna layout on board. B4.4 Source parameters
Total volume of the array combination, working pressure, sinking depth, and an array combination layout diagram and source wavelet spectrum diagram. B5 Quality analysis and problems
B6 Time analysis statistics
B7 Operation quality statistics and seismic operation daily report B8 List of main ships, team members and on-board representatives during construction C1 Cover of seismic record shift report
GEOPHYSICAL COMPANY OF FO
xx Oil Company Geophysical Exploration Company
SHIP: Ship name
CLIENT or on
FARTY CHIFF: Captain
SFISMICINSIRUMNIS Geological area
T)PF: Model
ELS: Filtering
GANSEITING: Increase and decrease adjustment
REODRD TIME: Remember time
SAMPIJ: RATE: Sample rate
FNSIY: School secret
HORMAT: FormatSEC
MNIIOR RECORD ONFVERYSRYES
MONITORING RECORD
LINEPRILER
_TRACENOFVERY
LINEAR SECTION POSITION
SEISMIC: ENERCY SURCF
NOOF GLNS:
Number of airguns
TOTAL VOL:
Total volume
AIRGLN PRESSURF
Airgun pressure
DEPTH AIRGEN
Deepth of placement
RFMARKS:
SY/T10015—1998
Appendix C
(Appendix of suggestion)
Contents of “ground report”
Table C1 Cover of earthquake record report
Towed cable two-dimensional earthquake record report
Ground China×
DATF:LI period
ARA: Work area
NAVIHATICN: Navigation
TYPF: Model
SYSIEM
Correspondence office: China Yi
-1.[NE: Survey line number
STRFAMER: Cable
TYPFOFCALLE: Cable model
CAHLENGTH Electrical range length E
INIEGREATED SAT NAY
TRIMARY NAY:+NAVATION
SFCONTARY NAY:EARLY SHIP
LXOPPLER SONAR:REOORDING EVERY SHOT
DIGITAL RECORDING
EVERY SHOT
MO OF LIE SECTNS:
NUMBER OF WORKING SECTIONS
SFTH N INTERVALS
HEAVY SECTION LENGTH
HYIRCHHNES IN SN:
NUMBER OF CARBOXYL DIAGRAM
WATER BREAKS:WATER BREAKS SIGNAL IS:
HHIWEHN SLLTHINS:
Set center
DEPTII OF CASLE:
Electric current and depth
Operator
C2 seismic recording shift report
SHIP: Ship name:
REMARKS
CLIENT: Client
JOBNO: Job number:
SHOTPOINT NO
Tape machine number BEGININGENDbzxz.net
SY/T10015—1998
Table C2 Earthquake recording shift report
OPERATORSLOG
Towing cable two-dimensional recording shift report
AREA：Work area：
RECORDNO
BEGINING
LINE：Surveying line
INMETER
DIRECTION
PAGE：
OBSERVER：Duty officer
DATE：Date
STREAMER DEPTH
FEATHERING
Cable depth
Bejing
Beijing time
REMARKS
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