Text preview
C 1 CLIENT Chevron USA Inc. !
C 2 LINE ZVSP !
C 3 DATE: 19-Oct-04 PROCESSOR: SCHLUMBERGER !
C 4 TOOL TYPE: VSI !
C 5 DATA TRACES/RECORD: 3 !
C 6 SAMPLE INTERVAL: 6447 SAMPLES/TRACE !
C 7 RECORDING FORMAT: SEGY MEASUREMENT SYSTEM: FT !
C 8 SAMPLE CODE: 32 BIT FLOATING POINT !
C 9 GAIN TYPE: !
C10 FILTERS ALIAS HZ NOTCH HZ BAND - HZ SLOPE - DB/OCT
C11 SOURCE TYPE: Itaga Airgun !
C12 SOURCE LOCATION: offset:150 ft, azi:180 deg, elev:-12 ft !
C13 SWEEP: START HZ END HZ LENGTH MS !
C14 TAPER: START LENGTH MS END LENGTH MS TYPE !
C15 SPREAD: !
C16 GEOPHONES: !
C17 PATTERN: !
C18 TRACES SORTED BY: !
C19 AMPLITUDE RECOVERY: !
C20 MAP PROJECTION ZONE ID COORDINATE UNITS !
C21 PROCESSING: !
C22 !
C23 COMPANY: Chevron USA Inc. !
C24 WELL: OCS-G 19409 001 ST00BP00 !
C25 FIELD: Alaminos Canyon 815 !
C26 !
C27 PROCESSING STEP: Raw VSP field stacks !
C28 !
C29 Trace 1 is vertical Z-axis, trace 2 is horizontal Y-axis !
C30 trace 3 is horizontal X-axis !
C31 !
C32 ************************ Default Header Byte Locations *******************!
C33 Shot No 9-12 Depth Coefficient 69-70 !
C34 Coordinate Coefficient 71-72 X Source 73-76 !
C35 Source Offset 37-40 Transit Time 107-108 Y Source 77-80 !
C36 Measured Depth 41-44 Recording Delay 109-110 X Receiver 81-84 !
C37 TVD 53-56 Number of Samples 115-116 Y Receiver 85-88 !
C38 *************** Migrated Data Default Header byte locations **************!
C39 CDP X 81-84 CDP Y 85-88 !
C40 CDP Offset 41-44 CDP Number 21-24 !
************************* Binary Heading *************************
Job Identification (Bytes 1- 4) : 0
Line Number (Bytes 5- 8) : 1
Reel Number (Bytes 9-12) : 3
Traces per record (Bytes 13-14) : 3
Aux Traces per record (Bytes 15-16) : 0
Sample Interval (uS) (Bytes 17-18) : 1000
Original Sample Interval (uS) (Bytes 19-20) : 0
Samples per data trace (Bytes 21-22) : 6447
Original Samples per data trace (Bytes 23-24) : 0
Data sample format code (Bytes 25-26) : 1
1=Floating Point 4 byte 2=Fixed Point 4 byte
3=Fixed Point 2 byte 4=Fixed Point with gain 4 byte
5=IEEE Floating Point 4 byte
CDP Fold (Bytes 27-28) : 0
Trace Sorting Code (Bytes 29-30) : 0
Vertical Sum Code (Bytes 31-32) : 0
Sweep Frequency at start (Bytes 33-34) : 0
Sweep Frequency at end (Bytes 35-36) : 0
Sweep Length (mSec) (Bytes 37-38) : 0
Sweep Type code (Bytes 39-40) : 0
Trace number of sweep channel (Bytes 41-42) : 0
Sweep Trace taper at start (Bytes 43-44) : 0
Sweep Trace taper at end (Bytes 45-46) : 0
Taper Type (Bytes 47-48) : 0
Correlated Data (1=N, 2=Y) (Bytes 49-50) : 0
Binary Gain Recovered (1=Y, 2=N) (Bytes 51-52) : 0
Amplitude Recovery Method (Bytes 53-54) : 0
Measurement System (1=m, 2=ft) (Bytes 55-56) : 2
Rec MD TVD REC X REC Y SRC X SRC Y TOFD
****** ********* ********* ********* ********* ********* ********* ******
------ 41-44 53-56 81-84 85-88 73-76 77-80 109-110
****** ********* ********* ********* ********* ********* ********* ******
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