The Canadian Well Logging Society's Floppy Disk Committee has designed a standard format for log data on floppy disks. It is known as the LAS format (Log ASCII Standard). LAS consists of files written in ASCII and containing minimal header information. The LAS format has evolved over the years. GeoSyn currently supports the import of two versions, 1.2 and 2.0.
GeoSyn will read an attached tops file, although strictly speaking tops are not included in the official LAS format. Two styles of tops formats are supported in Version 2.0, and one format is supported in Version 1.2.
| Truncated Example of LAS Version 2.0 | Truncated Example of LAS Version 1.2 |
|---|---|
| ~VERSION INFORMATION VERS. 2.00:CWLS LOG ASCII STANDARD - VERSION 2.00 WRAP. NO :One Line per depth step # ~WELL INFORMATION #MNEM.UNIT DATA DESCRIPTION #--------- ----------------------------------- ------------------------------ STRT.M 249.7836 :START DEPTH STOP.M 1254.2520 :STOP DEPTH STEP.M 0.1520 :STEP LENGTH NULL. -999.2500 :NULL VALUE COMP. AnyCompany OIL & GAS LIMITED :COMPANY WELL. AnyCompany etal AnyWhere :WELL LOC . AnyWhere :LOCATION # ~CURVE INFORMATION #MNEM.UNIT DATA DESCRIPTION #--------- ----------------------------------- ------------------------------ DEPT.M :1 Depth DT .US/M 7 520 80 00 :2 Sonic Travel Time RHOB.G/C3 31 350 02 00 :3 Bulk Density # ~PARAMETER INFORMATION #MNEM.UNIT DATA DESCRIPTION #--------- ----------------------------------- ------------------------------ EKB .M 300.0000 :Kelly bushing # ~t 7 Tops //or ~T 7 Tops T0 647.98 T1 800.89 T2 1011.86 Wabamun 1132.40 Ireton 1536.64 Slave Point 1812.01 Pre Cambrian 1841.80 # ~A DEPT DT RHOB 249.7836 410.825 1819.972 249.9356 410.752 1791.029 250.0876 410.679 1802.005 250.2396 410.607 1869.852 250.3916 410.534 1908.247 250.5436 410.461 1958.225 250.6956 410.388 1987.873 250.8476 410.316 2014.986 250.9996 410.249 2022.811 ... 1253.4396 169.758 2730.646 1253.5916 169.758 2730.646 1253.7436 169.758 2730.646 1253.8956 169.758 2730.646 1254.0476 169.758 2730.646 1254.1996 58.382 939.106 No special end of file characters are required. **alternate tops format ~Formation Tops Information #TOPS NAME . DEPTH: BR . 7221.0410: WPBI . 8034.6790: COLO . 8539.9220: CARD . 9553.6900: CARD . 9671.7980: L CA . 9743.9760: BKST . 9799.7500: |
~Version : LASOUT vs 1.20 VERS. 1.20: CWLS Log ASCII Standard -VERSION 1.20 WRAP. NO: One line per depth step ~Well Information Block #MNEM.UNIT Data Type Information #----.---- ------------: ------------------------------ STRT.M 250.0000: Start Depth STOP.M 2413.0000: End Depth STEP.M .2000: Depth Increment NULL. -999.25: COMP. COMPANY: WELL. WELL: Dog Patch LAKE 5-4 FLD . FIELD: Dog Patch LOC . LOCATION: 10-10-99-1w6 PROV. PROVINCE: ALBERTA SRVC. SERVICE COMPANY: FlyByNight Loggers DATE. LOG DATE: 1889/12/29 UWI . UNIQUE WELL ID: 0101010101010 ~Parameter Information Block #MNEM.UNIT Value Description #----.---- ------------: ------------------------------ BHT .DEGF .0000: Bottom Hole Temperature BS .MM .0000: Bit Size DFD .0000: Mud Weight (Density) DFV .0000: Mud Viscosity DFL . .0000: Mud Fluid Loss DFPH .0000: Mud pH RM .OHMM .0000: Mud Resistivity RMT .DEGF .0000: Mud Resistivity Temperature RMFS.OHMM .0000: Mud Filtrate Resistivity RMFT.DEGF .0000: RMF Temperature RMC .OHMM .0000: Mud Cake Resistivity RMCT.DEGF .0000: RMC Temperature EKB .M 987.5000: Elevation Kelly Bushing EGL .M 982.3000: Elevation Ground Level ~Curve Information Block #MNEM.UNIT API CODE Curve Description #----.---- ------------: ------------------------ DEPT.M : 1 DEPTH DT .USM 60 520 0 1: 2 RHOB.KM3 42 350 1 1: 3 ~A Depth DT RHOB 250.0000 376.4800 1922.6000 250.2000 345.2000 1998.4000 250.4000 313.9200 2363.4000 250.6000 282.6400 2512.2000 250.8000 254.4400 2463.2000 251.0000 275.8800 2392.0000 ... 2411.2000 -999.2500 2715.9000 2411.4000 -999.2500 2713.9000 2411.6000 -999.2500 2712.4000 2411.8000 -999.2500 2707.2000 2412.0000 -999.2500 2691.0000 2412.2000 -999.2500 2674.8000 2412.4000 -999.2500 2658.6000 2412.6000 -999.2500 2640.7000 2412.8000 -999.2500 2683.4000 2413.0000 -999.2500 2730.9000 No special end of file characters are required. |