Header section metadata¶
Tutorial¶
One of the primary motivations in writing lasio was to be able to reliably parse LAS header sections. This is working fairly well for LAS 1.2 and 2.0 files, and lasio does not require LAS files to be strictly compliant with either standard.
>>> import lasio.examples
>>> las = lasio.examples.open('6038187_v1.2_short.las')
The header sections are stored in the dictionary las.sections:
>>> type(las.sections)
dict
>>> las.sections.keys()
dict_keys(['Version', 'Well', 'Curves', 'Parameter', 'Other'])
These are special names reserved for LAS 1.2 and 2.0 files, as defined by the standard. Non-standard header sections are also allowed but not fully parsed.
| LAS file | Read in as | References in LASFile |
|---|---|---|
~v or ~V |
lasio.SectionItems |
LASFile.version and LASFile.sections['Version'] |
~w or ~W |
lasio.SectionItems |
LASFile.well and LASFile.sections['Well'] |
~c or ~C |
lasio.SectionItems |
LASFile.curves and LASFile.sections['Curves'] |
~p or ~P |
lasio.SectionItems |
LASFile.params and LASFile.sections['Parameter'] |
~o or ~O |
str |
LASFile.other and LASFile.sections['Other'] |
~extra section |
str |
LASFile.sections['extra section'] |
~a or ~A |
numpy.ndarray |
LASFile.data or each column is in LASFile.curves[...].data |
For example:
>>> las.sections['Version']
[HeaderItem(mnemonic="VERS", unit="", value="2.0", descr="CWLS LOG ASCII STANDA"),
HeaderItem(mnemonic="WRAP", unit="", value="NO", descr="ONE LINE PER DEPTH STE")]
>>> las.version
[HeaderItem(mnemonic="VERS", unit="", value="2.0", descr="CWLS LOG ASCII STANDA"),
HeaderItem(mnemonic="WRAP", unit="", value="NO", descr="ONE LINE PER DEPTH STE")]
Sections themselves are represented by lasio.SectionItems
objects. This is a list which has been extended to allow you to access the
items within by their mnemonic:
>>> las.version.VERS
HeaderItem(mnemonic="VERS", unit="", value="2.0", descr="CWLS LOG ASCII STANDA")
>>> las.version['VERS']
HeaderItem(mnemonic="VERS", unit="", value="2.0", descr="CWLS LOG ASCII STANDA")
>>> las.version[0]
HeaderItem(mnemonic="VERS", unit="", value="2.0", descr="CWLS LOG ASCII STANDA")
As you can see, either attribute-style or item-style access is fine.
Let’s take a look at the next special section, ~W:
>>> las.well
[HeaderItem(mnemonic="STRT", unit="M", value="0.05", descr="FIRST INDEX VALUE"),
HeaderItem(mnemonic="STOP", unit="M", value="136.6", descr="LAST INDEX VALUE"),
HeaderItem(mnemonic="STEP", unit="M", value="0.05", descr="STEP"),
HeaderItem(mnemonic="NULL", unit="", value="-99999", descr="NULL VALUE"),
HeaderItem(mnemonic="COMP", unit="", value="", descr="COMP"),
HeaderItem(mnemonic="WELL", unit="", value="Scorpio E1", descr="WELL"),
HeaderItem(mnemonic="FLD", unit="", value="", descr=""),
HeaderItem(mnemonic="LOC", unit="", value="Mt Eba", descr="LOC"),
HeaderItem(mnemonic="SRVC", unit="", value="", descr=""),
HeaderItem(mnemonic="CTRY", unit="", value="", descr=""),
HeaderItem(mnemonic="STAT", unit="", value="SA", descr="STAT"),
HeaderItem(mnemonic="CNTY", unit="", value="", descr=""),
HeaderItem(mnemonic="DATE", unit="", value="15/03/2015", descr="DATE"),
HeaderItem(mnemonic="UWI", unit="", value="6038-187", descr="WUNT")]
The CTRY item is blank. We will set it:
>>> las.well.CTRY = 'Australia'
>>> las.well.CTRY
HeaderItem(mnemonic="CTRY", unit="", value="Australia", descr="")
Notice that lasio.SectionItems plays a little trick here. It actually
sets the header_item.value attribute, instead of replacing the entire
lasio.HeaderItem object.
You can set any of the attributes directly. Let’s take an example from the ~C section:
>>> las.curves
[CurveItem(mnemonic="DEPT", unit="M", value="", descr="DEPTH", original_mnemonic="DEPT", data.shape=(121,)),
CurveItem(mnemonic="CALI", unit="MM", value="", descr="CALI", original_mnemonic="CALI", data.shape=(121,)),
CurveItem(mnemonic="DFAR", unit="G/CM3", value="", descr="DFAR", original_mnemonic="DFAR", data.shape=(121,)),
CurveItem(mnemonic="DNEAR", unit="G/CM3", value="", descr="DNEAR", original_mnemonic="DNEAR", data.shape=(121,)),
CurveItem(mnemonic="GAMN", unit="GAPI", value="", descr="GAMN", original_mnemonic="GAMN", data.shape=(121,)),
CurveItem(mnemonic="NEUT", unit="CPS", value="", descr="NEUT", original_mnemonic="NEUT", data.shape=(121,)),
CurveItem(mnemonic="PR", unit="OHM/M", value="", descr="PR", original_mnemonic="PR", data.shape=(121,)),
CurveItem(mnemonic="SP", unit="MV", value="", descr="SP", original_mnemonic="SP", data.shape=(121,)),
CurveItem(mnemonic="COND", unit="MS/M", value="", descr="COND", original_mnemonic="COND", data.shape=(121,))]
>>> las.curves.PR.unit = 'ohmm'
>>> las.curves.PR
CurveItem(mnemonic="PR", unit="ohmm", value="", descr="PR", original_mnemonic="PR", data.shape=(121,))
Now let’s look more closely at how to manipulate and add or remove items from a section.
In [195]: las.params
Out[195]:
[HeaderItem(mnemonic="BS", unit="", value="216 mm", descr="BS"),
HeaderItem(mnemonic="JOBN", unit="", value="", descr="JOBN"),
HeaderItem(mnemonic="WPMT", unit="", value="", descr="WPMT"),
HeaderItem(mnemonic="AGL", unit="", value="", descr="AGL"),
HeaderItem(mnemonic="PURP", unit="", value="Cased hole stratigraphy", descr="P"),
HeaderItem(mnemonic="X", unit="", value="560160", descr="X"),
HeaderItem(mnemonic="CSGL", unit="", value="0 m - 135 m", descr="CSGL"),
HeaderItem(mnemonic="UNIT", unit="", value="", descr="UNIT"),
HeaderItem(mnemonic="Y", unit="", value="6686430", descr="Y"),
HeaderItem(mnemonic="TDL", unit="", value="135.2 m", descr="TDL"),
HeaderItem(mnemonic="PROD", unit="", value="", descr="PROD"),
HeaderItem(mnemonic="MUD", unit="", value="Water", descr="MUD"),
HeaderItem(mnemonic="CSGS", unit="", value="100 mm", descr="CSGS"),
HeaderItem(mnemonic="ENG", unit="", value="", descr="ENG"),
HeaderItem(mnemonic="STEP", unit="", value="5 cm", descr="STEP"),
HeaderItem(mnemonic="FLUIDLEVEL", unit="", value="54 m", descr="FluidLevel"),
HeaderItem(mnemonic="CSGT", unit="", value="PVC", descr="CSGT"),
HeaderItem(mnemonic="WIT", unit="", value="", descr="WIT"),
HeaderItem(mnemonic="EREF", unit="", value="", descr="EREF"),
HeaderItem(mnemonic="PROJ", unit="", value="", descr="PROJ"),
HeaderItem(mnemonic="ZONE", unit="", value="53J", descr="ZONE"),
HeaderItem(mnemonic="DREF", unit="", value="GL", descr="DREF"),
HeaderItem(mnemonic="TDD", unit="", value="136 m", descr="TDD")]
We want to rename the DREF mnemonic as LMF. We can do so by changing the
header_item.mnemonic attribute.
>>> las.params.DREF.mnemonic = 'LMF'
>>> las.params
[HeaderItem(mnemonic="BS", unit="", value="216 mm", descr="BS"),
HeaderItem(mnemonic="JOBN", unit="", value="", descr="JOBN"),
HeaderItem(mnemonic="WPMT", unit="", value="", descr="WPMT"),
HeaderItem(mnemonic="AGL", unit="", value="", descr="AGL"),
HeaderItem(mnemonic="PURP", unit="", value="Cased hole stratigraphy", descr="P"),
HeaderItem(mnemonic="X", unit="", value="560160", descr="X"),
HeaderItem(mnemonic="CSGL", unit="", value="0 m - 135 m", descr="CSGL"),
HeaderItem(mnemonic="UNIT", unit="", value="", descr="UNIT"),
HeaderItem(mnemonic="Y", unit="", value="6686430", descr="Y"),
HeaderItem(mnemonic="TDL", unit="", value="135.2 m", descr="TDL"),
HeaderItem(mnemonic="PROD", unit="", value="", descr="PROD"),
HeaderItem(mnemonic="MUD", unit="", value="Water", descr="MUD"),
HeaderItem(mnemonic="CSGS", unit="", value="100 mm", descr="CSGS"),
HeaderItem(mnemonic="ENG", unit="", value="", descr="ENG"),
HeaderItem(mnemonic="STEP", unit="", value="5 cm", descr="STEP"),
HeaderItem(mnemonic="FLUIDLEVEL", unit="", value="54 m", descr="FluidLevel"),
HeaderItem(mnemonic="CSGT", unit="", value="PVC", descr="CSGT"),
HeaderItem(mnemonic="WIT", unit="", value="", descr="WIT"),
HeaderItem(mnemonic="EREF", unit="", value="", descr="EREF"),
HeaderItem(mnemonic="PROJ", unit="", value="", descr="PROJ"),
HeaderItem(mnemonic="ZONE", unit="", value="53J", descr="ZONE"),
HeaderItem(mnemonic="LMF", unit="", value="GL", descr="DREF"),
HeaderItem(mnemonic="TDD", unit="", value="136 m", descr="TDD")]
And now we need to add a new mnemonic.
>>> las.params.DRILL = lasio.HeaderItem(mnemonic='DRILL', value='John Smith', descr='Driller on site')
>>> las.params
[HeaderItem(mnemonic="BS", unit="", value="216 mm", descr="BS"),
HeaderItem(mnemonic="JOBN", unit="", value="", descr="JOBN"),
HeaderItem(mnemonic="WPMT", unit="", value="", descr="WPMT"),
HeaderItem(mnemonic="AGL", unit="", value="", descr="AGL"),
HeaderItem(mnemonic="PURP", unit="", value="Cased hole stratigraphy", descr="P"),
HeaderItem(mnemonic="X", unit="", value="560160", descr="X"),
HeaderItem(mnemonic="CSGL", unit="", value="0 m - 135 m", descr="CSGL"),
HeaderItem(mnemonic="UNIT", unit="", value="", descr="UNIT"),
HeaderItem(mnemonic="Y", unit="", value="6686430", descr="Y"),
HeaderItem(mnemonic="TDL", unit="", value="135.2 m", descr="TDL"),
HeaderItem(mnemonic="PROD", unit="", value="", descr="PROD"),
HeaderItem(mnemonic="MUD", unit="", value="Water", descr="MUD"),
HeaderItem(mnemonic="CSGS", unit="", value="100 mm", descr="CSGS"),
HeaderItem(mnemonic="ENG", unit="", value="", descr="ENG"),
HeaderItem(mnemonic="STEP", unit="", value="5 cm", descr="STEP"),
HeaderItem(mnemonic="FLUIDLEVEL", unit="", value="54 m", descr="FluidLevel"),
HeaderItem(mnemonic="CSGT", unit="", value="PVC", descr="CSGT"),
HeaderItem(mnemonic="WIT", unit="", value="", descr="WIT"),
HeaderItem(mnemonic="EREF", unit="", value="", descr="EREF"),
HeaderItem(mnemonic="PROJ", unit="", value="", descr="PROJ"),
HeaderItem(mnemonic="ZONE", unit="", value="53J", descr="ZONE"),
HeaderItem(mnemonic="LMF", unit="", value="GL", descr="DREF"),
HeaderItem(mnemonic="TDD", unit="", value="136 m", descr="TDD"),
HeaderItem(mnemonic="DRILL", unit="", value="John Smith", descr="Driller on si")]
Bingo.
What if we want to delete or remove an item? You can delete items the same way you would remove an item from a dictionary. Let’s remove the item we just added (DRILL):
>>> del las.well["DRILL"]
There are methods intended for removing curves. Say you want to remove the PR curve:
>>> las.delete_curve("PR")
[CurveItem(mnemonic="DEPT", unit="M", value="", descr="DEPTH", original_mnemonic="DEPT", data.shape=(121,)),
CurveItem(mnemonic="CALI", unit="MM", value="", descr="CALI", original_mnemonic="CALI", data.shape=(121,)),
CurveItem(mnemonic="DFAR", unit="G/CM3", value="", descr="DFAR", original_mnemonic="DFAR", data.shape=(121,)),
CurveItem(mnemonic="DNEAR", unit="G/CM3", value="", descr="DNEAR", original_mnemonic="DNEAR", data.shape=(121,)),
CurveItem(mnemonic="GAMN", unit="GAPI", value="", descr="GAMN", original_mnemonic="GAMN", data.shape=(121,)),
CurveItem(mnemonic="NEUT", unit="CPS", value="", descr="NEUT", original_mnemonic="NEUT", data.shape=(121,)),
CurveItem(mnemonic="SP", unit="MV", value="", descr="SP", original_mnemonic="SP", data.shape=(121,)),
CurveItem(mnemonic="COND", unit="MS/M", value="", descr="COND", original_mnemonic="COND", data.shape=(121,))]
Warning
Common mistake!
A common job is to iterate through the curves and remove all but a few that you are interested in. When doing this, be careful to iterate over a copy of the curves section:
>>> keep_curves = ['DEPT', 'DFAR', 'DNEAR']
>>> for curve in las.curves[:]:
... if curve.mnemonic not in keep_curves:
... las.delete_curve(curve.mnemonic)
...
>>> las.curves
[CurveItem(mnemonic="DEPT", unit="M", value="", descr="DEPTH", original_mnemonic="DEPT", data.shape=(121,)),
CurveItem(mnemonic="DFAR", unit="G/CM3", value="", descr="DFAR", original_mnemonic="DFAR", data.shape=(121,)),
CurveItem(mnemonic="DNEAR", unit="G/CM3", value="", descr="DNEAR", original_mnemonic="DNEAR", data.shape=(121,))]
Handling errors¶
lasio will do its best to read every line from the header section. If it can make sense of it, it will parse it into a mnemonic, unit, value, and description. However often there are problems in LAS files. For example, a header section might contain something like:
COUNTY: RUSSELL
This line is missing a period. It should be COUNTY. : RUSSELL. Or
another example:
API . : API Number (required if CTRY = US)
"# Surface Coords: 1,000' FNL & 2,000' FWL"
LATI .DEG : Latitude - see Surface Coords comment above
LONG .DEG : Longitude - see Surface Coords comment above
Obviously the line with ” causes an error.
All these (and any other kind of error in the header section) can be turned
from LASHeaderError exceptions into logger.warning() calls instead by
using lasio.read(..., ignore_header_errors=True). Here is an example.
First we try reading a file without this argument:
>>> las = lasio.examples.open('dodgy_param_sect.las', ignore_header_errors=False)
Unable to parse line as LAS header: DEPTH DT RHOB NPHI SFLU SFLA ILM ILD
Traceback (most recent call last):
File "C:\Users\kinve\code\lasio\lasio\reader.py", line 525, in parse_header_section
values = read_line(line, section_name=parser.section_name2)
File "C:\Users\kinve\code\lasio\lasio\reader.py", line 711, in read_line
return read_header_line(*args, **kwargs)
File "C:\Users\kinve\code\lasio\lasio\reader.py", line 780, in read_header_line
mdict = m.groupdict()
AttributeError: 'NoneType' object has no attribute 'groupdict'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Users\kinve\code\lasio\lasio\examples.py", line 46, in open
return open_local_example(filename, **kwargs)
File "C:\Users\kinve\code\lasio\lasio\examples.py", line 106, in open_local_example
return LASFile(os.path.join(examples_path, *filename.split("/")), **kwargs)
File "C:\Users\kinve\code\lasio\lasio\las.py", line 84, in __init__
self.read(file_ref, **read_kwargs)
File "C:\Users\kinve\code\lasio\lasio\las.py", line 222, in read
mnemonic_case=mnemonic_case,
File "C:\Users\kinve\code\lasio\lasio\las.py", line 142, in add_section
raw_section, **sect_kws
File "C:\Users\kinve\code\lasio\lasio\reader.py", line 536, in parse_header_section
raise exceptions.LASHeaderError(message)
lasio.exceptions.LASHeaderError: line 31 (section ~PARAMETER INFORMATION): "DEPTH DT RHOB NPHI SFLU SFLA ILM ILD"
Now if we use ignore_header_errors=True:
>>> las = lasio.examples.open('dodgy_param_sect.las', ignore_header_errors=True)
Unable to parse line as LAS header: DEPTH DT RHOB NPHI SFLU SFLA ILM ILD
line 31 (section ~PARAMETER INFORMATION): "DEPTH DT RHOB NPHI SFLU SFLA ILM ILD"
Only a warning is issued, and the rest of the LAS file loads OK:
>>> las.params
[]
>>> las.curves
[CurveItem(mnemonic="DEPT", unit="M", value="", descr="1 DEPTH", original_mnemonic="DEPT", data.shape=(3,)),
CurveItem(mnemonic="DT", unit="US/M", value="", descr="2 SONIC TRANSIT TIME", original_mnemonic="DT", data.shape=(3,)),
CurveItem(mnemonic="RHOB", unit="K/M3", value="", descr="3 BULK DENSITY", original_mnemonic="RHOB", data.shape=(3,)),
CurveItem(mnemonic="NPHI", unit="V/V", value="", descr="4 NEUTRON POROSITY", original_mnemonic="NPHI", data.shape=(3,)),
CurveItem(mnemonic="SFLU", unit="OHMM", value="", descr="5 RXO RESISTIVITY", original_mnemonic="SFLU", data.shape=(3,)),
CurveItem(mnemonic="SFLA", unit="OHMM", value="", descr="6 SHALLOW RESISTIVITY", original_mnemonic="SFLA", data.shape=(3,)),
CurveItem(mnemonic="ILM", unit="OHMM", value="", descr="7 MEDIUM RESISTIVITY", original_mnemonic="ILM", data.shape=(3,)),
CurveItem(mnemonic="ILD", unit="OHMM", value="", descr="8 DEEP RESISTIVITY", original_mnemonic="ILD", data.shape=(3,))
]
Handling duplicate mnemonics¶
Take this LAS file as an example, containing this ~C section:
~CURVE INFORMATION
DEPT.M : 1 DEPTH
DT .US/M : 2 SONIC TRANSIT TIME
RHOB.K/M3 : 3 BULK DENSITY
NPHI.V/V : 4 NEUTRON POROSITY
RXO.OHMM : 5 RXO RESISTIVITY
RES.OHMM : 6 SHALLOW RESISTIVITY
RES.OHMM : 7 MEDIUM RESISTIVITY
RES.OHMM : 8 DEEP RESISTIVITY
Notice there are three curves with the mnemonic RES. When we load the file in, lasio distinguishes between these duplicates:
>>> las = lasio.read('tests/examples/mnemonic_duplicate2.las')
>>> las.curves
[CurveItem(mnemonic="DEPT", unit="M", value="", descr="1 DEPTH", original_mnemonic="DEPT", data.shape=(3,)),
CurveItem(mnemonic="DT", unit="US/M", value="", descr="2 SONIC TRANSIT TIME", original_mnemonic="DT", data.shape=(3,)),
CurveItem(mnemonic="RHOB", unit="K/M3", value="", descr="3 BULK DENSITY", original_mnemonic="RHOB", data.shape=(3,)),
CurveItem(mnemonic="NPHI", unit="V/V", value="", descr="4 NEUTRON POROSITY", original_mnemonic="NPHI", data.shape=(3,)),
CurveItem(mnemonic="RXO", unit="OHMM", value="", descr="5 RXO RESISTIVITY", original_mnemonic="RXO", data.shape=(3,)),
CurveItem(mnemonic="RES:1", unit="OHMM", value="", descr="6 SHALLOW RESISTIVITY", original_mnemonic="RES", data.shape=(3,)),
CurveItem(mnemonic="RES:2", unit="OHMM", value="", descr="7 MEDIUM RESISTIVITY", original_mnemonic="RES", data.shape=(3,)),
CurveItem(mnemonic="RES:3", unit="OHMM", value="", descr="8 DEEP RESISTIVITY", original_mnemonic="RES", data.shape=(3,))
]
>>> las.curves['RES:2']
CurveItem(mnemonic="RES:2", unit="OHMM", value="", descr="7 MEDIUM RESISTIVITY", original_mnemonic="RES", data.shape=(3,))
It remembers the original mnemonic, so when you write the file back out, they come back:
>>> from sys import stdout
>>> las.write(stdout)
~Version ---------------------------------------------------
VERS. 1.2 : CWLS LOG ASCII STANDARD - VERSION 1.2
WRAP. NO : ONE LINE PER DEPTH STEP
~Well ------------------------------------------------------
STRT.M 1670.0 :
STOP.M 1669.75 :
STEP.M -0.125 :
NULL. -999.25 :
COMP. COMPANY : # ANY OIL COMPANY LTD.
WELL. WELL : ANY ET AL OIL WELL #12
FLD . FIELD : EDAM
LOC . LOCATION : A9-16-49-20W3M
PROV. PROVINCE : SASKATCHEWAN
SRVC. SERVICE COMPANY : ANY LOGGING COMPANY LTD.
DATE. LOG DATE : 25-DEC-1988
UWI . UNIQUE WELL ID : 100091604920W300
~Curves ----------------------------------------------------
DEPT.M : 1 DEPTH
DT .US/M : 2 SONIC TRANSIT TIME
RHOB.K/M3 : 3 BULK DENSITY
NPHI.V/V : 4 NEUTRON POROSITY
RXO .OHMM : 5 RXO RESISTIVITY
RES .OHMM : 6 SHALLOW RESISTIVITY
RES .OHMM : 7 MEDIUM RESISTIVITY
RES .OHMM : 8 DEEP RESISTIVITY
~Params ----------------------------------------------------
BHT .DEGC 35.5 : BOTTOM HOLE TEMPERATURE
BS .MM 200.0 : BIT SIZE
FD .K/M3 1000.0 : FLUID DENSITY
MATR. 0.0 : NEUTRON MATRIX(0=LIME,1=SAND,2=DOLO)
MDEN. 2710.0 : LOGGING MATRIX DENSITY
RMF .OHMM 0.216 : MUD FILTRATE RESISTIVITY
DFD .K/M3 1525.0 : DRILL FLUID DENSITY
~Other -----------------------------------------------------
Note: The logging tools became stuck at 625 meters causing the data
between 625 meters and 615 meters to be invalid.
~ASCII -----------------------------------------------------
1670 123.45 2550 0.45 123.45 123.45 110.2 105.6
1669.9 123.45 2550 0.45 123.45 123.45 110.2 105.6
1669.8 123.45 2550 0.45 123.45 123.45 110.2 105.6
Normalising mnemonic case¶
If there is a mix of upper and lower case characters in the mnemonics, by default lasio will convert all mnemonics to uppercase to avoid problems with producing the :1, :2, :3, and so on. There is a keyword argument which will preserve the original formatting if that is what you prefer.
>>> las = lasio.read('tests/examples/mnemonic_case.las')
>>> las.curves
[CurveItem(mnemonic="DEPT", unit="M", value="", descr="1 DEPTH", original_mnemonic="DEPT", data.shape=(3,)),
CurveItem(mnemonic="SFLU:1", unit="K/M3", value="", descr="3 BULK DENSITY", original_mnemonic="SFLU", data.shape=(3,)),
CurveItem(mnemonic="NPHI", unit="V/V", value="", descr="4 NEUTRON POROSITY", original_mnemonic="NPHI", data.shape=(3,)),
CurveItem(mnemonic="SFLU:2", unit="OHMM", value="", descr="5 RXO RESISTIVITY", original_mnemonic="SFLU", data.shape=(3,)),
CurveItem(mnemonic="SFLU:3", unit="OHMM", value="", descr="6 SHALLOW RESISTIVITY", original_mnemonic="SFLU", data.shape=(3,)),
CurveItem(mnemonic="SFLU:4", unit="OHMM", value="", descr="7 MEDIUM RESISTIVITY", original_mnemonic="SFLU", data.shape=(3,)),
CurveItem(mnemonic="SFLU:5", unit="OHMM", value="", descr="8 DEEP RESISTIVITY", original_mnemonic="SFLU", data.shape=(3,))
]
>>> las = lasio.read('tests/examples/mnemonic_case.las', mnemonic_case='preserve')
>>> las.curves
[CurveItem(mnemonic="Dept", unit="M", value="", descr="1 DEPTH", original_mnemonic="Dept", data.shape=(3,)),
CurveItem(mnemonic="Sflu", unit="K/M3", value="", descr="3 BULK DENSITY", original_mnemonic="Sflu", data.shape=(3,)),
CurveItem(mnemonic="NPHI", unit="V/V", value="", descr="4 NEUTRON POROSITY", original_mnemonic="NPHI", data.shape=(3,)),
CurveItem(mnemonic="SFLU:1", unit="OHMM", value="", descr="5 RXO RESISTIVITY", original_mnemonic="SFLU", data.shape=(3,)),
CurveItem(mnemonic="SFLU:2", unit="OHMM", value="", descr="6 SHALLOW RESISTIVITY", original_mnemonic="SFLU", data.shape=(3,)),
CurveItem(mnemonic="sflu", unit="OHMM", value="", descr="7 MEDIUM RESISTIVITY", original_mnemonic="sflu", data.shape=(3,)),
CurveItem(mnemonic="SfLu", unit="OHMM", value="", descr="8 DEEP RESISTIVITY", original_mnemonic="SfLu", data.shape=(3,))
]