Ebook: The essentials of log interpretation practice

On exploration wells, after the logs have been made, some quick answers are needed: what formations are potential hydrocarbon producers? Will it be gas or oil? Approximate volumetric evaluation? In the case of development wells, the main interest usually is for an accurate evaluation of the volume of hydrocarbons.

In some cases the logs provide obvious answers to this type of question. More often. a study of the logs is needed; it can be a 'quick look' interpretation when rapid answers are needed; it can be a detailed analysis, 'manual' or computer-processed, when an accurate quantitative evaluation is required. In all cases log interpretation requires a good knowledge of the behaviour of the logging tools and of their limitations.

Description of the logging tools is given in this book.