LAS File Viewer

GEMINI is a public domain web application focused on analysis and modeling of petroleum reservoirs and plays. The GEMINI project was created with a strong dependence on the Kansas Geological Surveys (KGS) Database and File Directory Structure. Most of the GEMINI Modules require digital LAS files (version 2) to run and many users have voiced a displeasure of having to upload their files to KGS first in order to run GEMINI. The LAS File Viewer Web Site was created so the general user who wishes to view a digital LAS file that is on their PC without having to upload the file to KGS first or buy an expensive software package can do just that.

LAS Viewer Applet was created to assist the user in locating and viewing digital LAS (Log ASCII Standard version 2.0) Files. Kansas Geological Survey (KGS) has provided a LAS File Viewer for a number of years, but that version only displays digital LAS Files that are on the KGS Server. If the user wanted to plot a digital LAS File that was on their PC using KGS GEMINI LAS File Viewer they had to upload the LAS File first. This web site will allow the user to open and plot a digital LAS File on the Users PC.

To save the oil & gas data to your pc this web application uses an io class that will create and maintain a KGS Application XML File Database on your pc. The web application requires that the user give permission to read & save oil & gas data on their pc each time they execute this program.

NOTE: This web application will not move data from your pc to the KGS Server without your permission. There is an "Upload your Kansas digital LAS Files" button and this is the only application that will move data to the KGS Server from your pc. The user has to enter the directory path & filename in order for the web application to work.

Generally the web browser only allows the user to access of files that are on the Server that the web application resides on. This Web Application uses a JAR Signing and Verification Tool to protect the Web Application from being modified by anyone else except the developer of the application. This tool provides the capability to verify the signatures and integrity of the Web Application. The Web Application cannot be forged, the verification process is also a function of the data that was originally created with the original signing process and can not be altered. If the data has been changed the verification signature will no longer verify as being authentic.

When you try to save data to your pc you will be asked to provide a base directory path where you wish to save the data created by the KGS web application tools. A directory KGS_Application_XML_Files will be created under your selection. Note: the base directory has to exist before the KGS_Application_XML_Files directory can be created. A KGS_Apps_Saved_Data.xml file will also be created under your home directory telling the web application each time you enter were this directory structure is. This way you do not have to remember were your data is, the web application will do that. The io class builds "Projects" automatically when a user first saves data to the KGS XML File Database and maintains the project integrity by creating unique directory names from the user date and time. For the LAS Viewer web application the projects will begin with a "W" to represent Well Level application. There are other web applications that will also use this KGS XML File Database structure and will use other prefixes to distinguish them from the well level projects.

There are three types of LAS File Viewers used with this application,

1. Simple LAS Viewer - This viewer will allow the user to open & plot the digital LAS File. This version will plot the following oil & gas data if it is available,
   • Formation tops
   • Perforation depth range
   • DST measurment depth range
   • Core Images
2. Well Profile Viewer - This viewer is an interactive web application that will allow the user the ability to modify the location of the log curves as well as the log curves that will appear in the LAS plot. This version will plot the following oil & gas data if it is available,
   • Formation tops
   • Perforation depth range
   • DST measurment depth range
   • Core Images
   • Measured Core Data
3. Enter Regions Profile Viewer - This viewer allows the user to enter their own formation tops, perforation and DST measurement depth ranges as well as well header information and to save that data to the KGS XML File Database structure. This viewer is an interactive web application that will allow the user the ability to modify the location of the log curves as well as the log curves that will appear in the LAS plot. This version will plot the following oil & gas data if it is available in the KGS XML File Database structure on your pc,
   • Formation tops
   • Perforation depth range
   • DST measurment depth range
   • Core Images
   • Measured Core Data
   Note: Once the user saves the Regions & Well Header Information the digital LAS File Directory Path & Filename are also saved. If the user moves this digital LAS file to another directory or changes the filename then this web application will not be able to find and plot the file again when the user uses the previously saved sessions button.

Author: John R. Victorine jvictor@kgs.ku.edu

This page created September 2004, modified December 2006. Send comments to webadmin@kgs.ku.edu
The URL for this page is http://www.kgs.ku.edu/Gemini/Tools/LAS/LASViewer.html