Application of Computers to the Interpretation of Well Logs
- Vladimir S. Tuman (U. of Illinois) | Dorothy Bollman (U. of Illinois)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- April 1961
- Document Type
- Journal Paper
- 311 - 318
- 1961. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.3.4 Scale, 2.4.3 Sand/Solids Control, 5.8.7 Carbonate Reservoir, 1.6.9 Coring, Fishing, 5.6.1 Open hole/cased hole log analysis, 5.2 Reservoir Fluid Dynamics
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Available digital computers can be effectively used for the interpretation of well logs by the following procedure: (1) digitizing the well log data, (2) preparing the programs to process the data, and (3) analysis and evaluation of the results.
Types of available digitizing units are discussed. At present, the cost of digitization is greater than the cost of processing the same data by a computer. Consequently, further developments will be required to reduce the cost of getting the data in digital form.
An effort is made to indicate how to write a program for a digital computer, and a step-by-step example is worked out. Some examples processed on the computer for the formations in the Illinois basin are also included. Five programs prepared at the U. of Illinois are discussed. Detailed flow charts for four of these programs, including the "Discriminating Routine Program", are given. This program discriminates sands or porous beds from shales. It is the basic program for the automatic processing of the well logs which will control the over-all operation of the computer. It also can be used by geologists who are interested in sand/shale counts.
A rough economic study of the problem indicates that it will be advantageous to encourage service companies in the future to offer digitized well logs.
High-speed computers are useful in handling two types of problems: (1) a group of complex problems which have a very large number of operations; and (2) one or more problems where there is a need for varying the parameters and, consequently, for repeating the operations a large number of times.
The thorough evaluation of well logs embraces both groups of problems.
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