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https://github.com/oze4/golas
Lexer/Parser for geophysical well logs (.las files)
https://github.com/oze4/golas
geophysical-well-logs las las-files las-lexer las-parser
Last synced: about 1 month ago
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Lexer/Parser for geophysical well logs (.las files)
- Host: GitHub
- URL: https://github.com/oze4/golas
- Owner: oze4
- License: unlicense
- Created: 2020-11-24T03:38:55.000Z (about 4 years ago)
- Default Branch: master
- Last Pushed: 2020-11-28T12:47:31.000Z (about 4 years ago)
- Last Synced: 2024-06-19T05:32:25.710Z (6 months ago)
- Topics: geophysical-well-logs, las, las-files, las-lexer, las-parser
- Language: Go
- Homepage:
- Size: 51.8 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# golas
### Parse geophysical well logs (.las files)
- Lexer & parser
- Self contained
- Uses stdlib only
- No third party libraries
- Easily marshal our output to JSON/YAML
- Currently, we only support LAS 2.0:
- [CWLS LAS 2.0](http://www.cwls.org/wp-content/uploads/2014/09/LAS_20_Update_Jan2014.pdf) standard
---
# Example
The following example uses [this](/samples/unwrapped.las) .las file as input
```golang
package main
import (
"os"
"github.com/oze4/golas"
)
func main() {
lasReader, _ := os.Open("samples/unwrapped.las")
las := golas.Parse(lasReader)
prettyPrintStructAsJSON(las)
}
func prettyPrintStructAsJSON(v interface{}) {
if j, e := json.MarshalIndent(v, "", " "); e != nil {
fmt.Printf("Error : %s \n", e.Error())
} else {
fmt.Printf("%s\n", string(j))
}
}
```
Which gives us...
```
{
"Sections": [
{
"Name": "Version Information",
"Lines": [
{
"Mnem": "VERS",
"Units": "",
"Data": "2.0",
"Description": "CWLS LOG ASCII STANDARD -VERSION 2.0"
},
{
"Mnem": "WRAP",
"Units": "",
"Data": "NO",
"Description": "ONE LINE PER DEPTH STEP"
}
],
"Comments": null
},
{
"Name": "Well Information",
"Lines": [
{
"Mnem": "WELL",
"Units": "",
"Data": "NORVEHC MGSU 1 MITSUE 01-01",
"Description": "Well_name - WELL"
},
{
"Mnem": "LOC",
"Units": "",
"Data": "00/01-01-073-05W5/0",
"Description": "Location - LOCATION"
},
{
"Mnem": "UWI",
"Units": "",
"Data": "00/01-01-073-05W5/0",
"Description": "Uwi - UNIQUE WELL ID"
},
{
"Mnem": "ENTR",
"Units": "",
"Data": "JOHN",
"Description": "Entered - ENTERED BY"
},
{
"Mnem": "SRVC",
"Units": "",
"Data": "REGREBMULHCS",
"Description": "Scn - SERVICE COMPANY"
},
{
"Mnem": "DATE",
"Units": "",
"Data": "01 JAN 70",
"Description": "Date - LOG DATE"
},
{
"Mnem": "STRT",
"Units": "M",
"Data": "390",
"Description": "top_depth - START DEPTH"
},
{
"Mnem": "STOP",
"Units": "M",
"Data": "650",
"Description": "bot_depth - STOP DEPTH"
},
{
"Mnem": "STEP",
"Units": "M",
"Data": "0.25",
"Description": "increment - STEP LENGTH"
},
{
"Mnem": "NULL",
"Units": "",
"Data": "-999.2500",
"Description": "NULL Value"
}
],
"Comments": [
"#MNEM.UNIT DATA DESCRIPTION OF MNEMONIC",
"#--------- ------------------- -------------------------------",
"# Generated from Intellog Unique Number\tCW_0099_0099/WELL/0099"
]
},
{
"Name": "Curve Information",
"Lines": [
{
"Mnem": "DEPT",
"Units": "M",
"Data": "00 001 00 00",
"Description": "DEPTH - DEPTH"
},
{
"Mnem": "DPHI",
"Units": "V/V",
"Data": "00 890 00 00",
"Description": "PHID - DENSITY POROSITY (SANDSTONE)"
},
{
"Mnem": "NPHI",
"Units": "V/V",
"Data": "00 330 00 00",
"Description": "PHIN - NEUTRON POROSITY (SANDSTONE)"
},
{
"Mnem": "GR",
"Units": "API",
"Data": "00 310 00 00",
"Description": "GR - GAMMA RAY"
},
{
"Mnem": "CALI",
"Units": "MM",
"Data": "00 280 01 00",
"Description": "CAL - CALIPER"
},
{
"Mnem": "ILD",
"Units": "OHMM",
"Data": "00 120 00 00",
"Description": "RESD - DEEP RESISTIVITY (DIL)"
}
],
"Comments": [
"#MNEM.UNIT ERCB CURVE CODE CURVE DESCRIPTION",
"#----------- ------------------ ----------------------------------"
]
},
{
"Name": "Parameter Information",
"Lines": [
{
"Mnem": "GL",
"Units": "M",
"Data": "583.3",
"Description": "gl - GROUND LEVEL ELEVATION"
},
{
"Mnem": "EREF",
"Units": "M",
"Data": "589",
"Description": "kb - ELEVATION OF DEPTH REFERENCE"
},
{
"Mnem": "DATM",
"Units": "M",
"Data": "583.3",
"Description": "datum - DATUM ELEVATION"
},
{
"Mnem": "TDD",
"Units": "M",
"Data": "733.4",
"Description": "tdd - TOTAL DEPTH DRILLER"
},
{
"Mnem": "RUN",
"Units": "",
"Data": "ONE",
"Description": "Run - RUN NUMBER"
},
{
"Mnem": "ENG",
"Units": "",
"Data": "SIMMONS",
"Description": "Engineer - RECORDING ENGINEER"
},
{
"Mnem": "WIT",
"Units": "",
"Data": "SANK",
"Description": "Witness - WITNESSED BY"
},
{
"Mnem": "BASE",
"Units": "",
"Data": "S.L.",
"Description": "Branch - HOME BASE OF LOGGING UNIT"
},
{
"Mnem": "MUD",
"Units": "",
"Data": "GEL CHEM",
"Description": "Mud_type - MUD TYPE"
},
{
"Mnem": "MATR",
"Units": "",
"Data": "SANDSTONE",
"Description": "Logunit - NEUTRON MATRIX"
},
{
"Mnem": "TMAX",
"Units": "C",
"Data": "41",
"Description": "BHT - MAXIMUM RECORDED TEMPERATURE"
},
{
"Mnem": "BHTD",
"Units": "M",
"Data": "733.8",
"Description": "BHTDEP - MAXIMUM RECORDED TEMPERATURE"
},
{
"Mnem": "RMT",
"Units": "C",
"Data": "17",
"Description": "MDTP - TEMPERATURE OF MUD"
},
{
"Mnem": "MUDD",
"Units": "KG/M",
"Data": "1100",
"Description": "MWT - MUD DENSITY"
},
{
"Mnem": "NEUT",
"Units": "",
"Data": "1",
"Description": "NEUTRON - NEUTRON TYPE"
},
{
"Mnem": "RESI",
"Units": "",
"Data": "0",
"Description": "RESIST - RESISTIVITY TYPE"
},
{
"Mnem": "RM",
"Units": "OHMM",
"Data": "2.62",
"Description": "RM - RESISTIVITY OF MUD"
},
{
"Mnem": "RMC",
"Units": "OHMM",
"Data": "0",
"Description": "RMC - RESISTIVITY OF MUD CAKE"
},
{
"Mnem": "RMF",
"Units": "OHMM",
"Data": "1.02",
"Description": "RMF - RESISTIVITY OF MUD FILTRATE"
},
{
"Mnem": "SUFT",
"Units": "C",
"Data": "0",
"Description": "SUFT - SURFACE TEMPERATURE"
}
],
"Comments": [
"#MNEM.UNIT DATA DESCRIPTION OF MNEMONIC",
"#--------- ----------- ------------------------------"
]
},
{
"Name": "~My Custom Section",
"Lines": [
{
"Mnem": "MNEM_VAL",
"Units": "UNIT_VAL",
"Data": "DATA_VAL",
"Description": "DESCRIPTION_VAL"
}
],
"Comments": null
}
]
}
```