Read/write well data from Log ASCII Standard (LAS) files
This is a Python package to read and write Log ASCII Standard (LAS) files, used for borehole/well data (e.g. geophysical/geological/petrophysical logs). It is compatible with versions 1.2 and 2.0 of the LAS file specification, published by the Canadian Well Logging Society. In principle it is designed to read as many types of LAS files as possible, including ones containing common errors or non-compliant formatting.
It is written entirely in Python and works on any platform. It depends on the following packages available on PyPI:
To install from PyPI use:
$ pip install lasio
If necessary this will download and install the package dependencies listed above.
$ git clone https://github.com/kinverarity1/lasio.git $ cd lasio $ python setup.py develop
How to use
Look at the example IPython notebooks here. More detailed examples are coming.
Opening LAS files
To open a LAS file from disk:
>>> import lasio >>> l = lasio.read("example.las")
To open a LAS file from a URL:
>>> l = lasio.read("http://someplace.com/example.las")
The curve data are available as items:
>>> l["ILD"] [145, 262, 272, ...]
Or you can iterate through the curves:
>>> for c in l.curves: ... print c.mnemonic, c.unit, c.data DEPT m [0, 0.05, 0.10, ...] ILD mS/m [145, 262, 272, ...]
- Do nothing and hope for no errors.
- Specify the encoding (internally lasio uses the open function from codecs which is part of the standard library):
>>> l = lasio.read("example.las", encoding="windows-1252")
- Install a third-party package like cChardet (faster) or chardet (slower) to automatically detect the character encoding. If these packages are installed this code will use whichever is faster:
>>> l = lasio.read("example.las", autodetect_encoding=True)
Note that by default autodetect_encoding=False.
- 0.7 (2015-08-08) - all tests passing on Python 2.6 through 3.4
- 0.6 (2015-08-05) - bugfixes and renamed from las_reader to lasio
- 0.5 (2015-08-01) - Improvements to writing LAS files
- 0.4 (2015-07-26) - Improved handling of character encodings, other internal improvements
- 0.3 (2015-07-23) - Added Python 3 support, now reads LAS 1.2 and 2.0
- 0.2 (2015-07-08) - Tidied code and published on PyPI
Contributions are very welcome. Please fork the project on GitHub and submit a pull request (PR) containing any changes you have made.
Thanks to the following people in chronological order for their help:
The code is freely available for any kind of use or modification under the MIT License.
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