.LAS Log ASCII Standard File Description
File Format
The .LAS Log ASCII Standard file format is a format widely used to exchange well log data. Originally .LAS was designed around a collection of file “sections”. Each section begins with a title line, marked with a tilde (“~”) at the beginning of the line. Sections for well structure, parameter information, and actual parameter data are included in most .LAS files.
Currently, Surfer imports version 1.2, 2.x, and most 3.x .LAS files. For additional information on specifics about each file format, refer to the Canadian Well Logging Society.
References:
LAS Specification v1.4 - R13. American Society for Photogrammetry & Remote Sensing. 15 July 2013. http://www.asprs.org/