Abstract
This chapter addresses the control of oil and gas field exploration by means of exploratory drilling. The number of new prospects drilled annually and the number of discovered fields in appraisal drilling also does not significantly change from one year to the next. The average duration of well construction and the average depth of wells, as well as the discovery success rate and the number of exploratory and appraisal wells for each structure or field, behave similarly. Methodological parameters are not independent. They are closely interrelated and connected with the goal and technology parameters. In order for the exploration process to proceed in an efficient manner, there must be purposeful relations among these parameters. A relationship exists based on the successive adaptation of the exploration-appraisal process to the information being accumulated. Indeed, the exploratory and appraisal process occurs in such a manner that drilling of subsequent wells is guided by the results obtained from the preceding wells.
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