The geologist, in the achievement of his many and varied duties, has found the electrical well log to be a useful tool. Many different types of logs are available and to be most useful the proper logs must be run. The selection of the logging program is often the responsibility of the geologist. It is found the proper selection entails many considerations, such as bore-hole conditions, formation characteristics, and ultimate use of the logs. These are discussed and a guide is offered to assist in the selection of the proper logging program. The data available from the logs have numerous geological applications. These data are summarized and examples presented to illustrate various applications.

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