lasgo

las-go is a GoLang library/package for parsing .Las file (Geophysical well log files).

Currently supports only version 2.0 of LAS Specification. For more information about this format, see the Canadian Well Logging Society product page.

How to use

• Installing

  GO GET

    go get github.com/laslibs/las-go
  

• Test

    go test ./...
  

• Usage

  import (
    lasgo "github.com/laslibs/las-go"
  )
  

• Read data

  Use Las.Data() to get a 2-dimensional slice containing the readings of each log

      func main() {
      las, err := lasgo.Las("sample/A10.las")
      if err != nil {
        panic(err)
      }
      fmt.Println(las.Data())
    /**
       [[2650.0 177.825 -999.25 -999.25],
        [2650.5 182.5 -999.25-999.25]
        [2651.0180.162 -999.25 -999.25]
        [2651.5 177.825 -999.25 -999.25]
        [2652.0 177.825 -999.25 -999.25] ...]
      */
     }
  

• Get the log headers

      // ...
      headers := las.Header();
      fmt.Println(headers);
      // [DEPTH GR NPHI RHOB]
      // ...
  

• Get the log headers descriptions as map[string]string

      //...
      headerAndDesc := las.headerAndDesc()
      fmt.Println(headerAndDesc)
      // [DEPTH: DEPTH GR: Gamma Ray NPHI: Neutron Porosity RHOB: Bulk density]
      // ...
  

• Get a particular column, say Gamma Ray log

      // ...
      gammaRay := las.Column("GR");
      fmt.Println(gammaRay);
      // [-999.25 -999.25 -999.25 -999.25 -999.25 122.03 123.14 ...]
      // ...
  

• Get the Well Parameters

  Presents a way of accessing the details of individual well parameters.

  The details include the following:

    1. description - Description/ Full name of the well parameter
    2. unit - Its unit of measurement
    3. value - Value measured
  

    // ...
    well := las.WellParams()
    start := well["STRT"].value // 1670.0
    stop := well["STOP"].value // 1669.75
    null_value := well["NULL"].value //  -999.25
    // Any other well parameter present in the file, can be gotten with the same syntax above
    // ...
  

• Get the Curve Parameters

  Presents a way of accessing the details of individual log columns.

  The details include the following:

    1. description - Description/ Full name of the log column
    2. unit - Unit of the log column measurements
    3. value - API value of the log column
  

    // ...
    curve := las.CurveParams()
    NPHI := curve["NPHI"].description // Neutron Porosity
    RHOB := curve["RHOB"].description // Bulk density
    // This is the same for all log column present in the file
    // ...
  

• Get the Parameters of the well

  The details include the following:

    1. description - Description/ Full name of the log column
    2. unit - Unit of the log column measurements
    3. value - API value of the log column
  

    // ...
    param := await las.LogParams(); // BOTTOM HOLE TEMPERATURE
    BHT := param["BHT"].description // BOTTOM HOLE TEMPERATURE
    BHTValaue := param["BHT"].value // 35.5
    BHTUnits := param["BHT"].unit // DEGC
    // This is the same for all well parameters present in the file
    // ...
  

• Get the number of rows and columns

      // ...
      numRows := las.RowCount() // 4
      numColumns := las.ColumnCount() // 3081
      // ...
  

• Get the version and wrap

      // ...
      version := las.Version() // 2.0
      wrap := las.Wrap() // true
      // ...
  

• Get other information

      // ...
      other := myLas.Other()
      fmt.Println(other)
      // Note: The logging tools became stuck at 625 metres causing the data between 625 metres and 615 metres to be invalid.
      // ...
  

• Export to CSV

  This writes a csv file to the current working directory, with headers of the well and data section

      //...
      las.ToCSV("result")
      //...
  

  result.csv

  DEPT	RHOB	GR	NPHI
  0.5	-999.25	-999.25	-0.08
  1.0	-999.25	-999.25	-0.08
  1.5	-999.25	-999.25	-0.04
  ...	...	...	...
  1.3	-999.25	-999.25	-0.08