Fundamentals of Well-Log Interpretation - 2. The Interpretation of Logging Data

  • Serra O
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Abstract

This chapter discusses the structure of tectonics using dipmeter. Generally, three methods of dipmeter interpretation are used. The first one, which can be qualified as a “Quick-Look” technique, uses dip patterns. The second, more quantitative, uses techniques introduced by Bengtson, an inventor formerly working for Chevron and Sohio. The third, more scientifically based, uses stereographic projections. The rapid analysis of a dipmeter generally starts by determining the structural dip from the arrow plots. The dip of the beds is defined by assuming they were deposited horizontally and parallel to each other. By extrapolating this dip, the architecture of the beds and the shape of the structure they constitute can be inferred. Structural dip is generally defined as a predominant dip over a thick interval of constant azimuth and magnitude. Therefore, a base line, or succession of green patterns with the same angle and ostensibly the same azimuth, can be determined on the arrow plots if the dip is steep. Structural dip is, thus, determined by a visual or graphic statistical analysis. In the case of graphic statistical analysis, dip histograms and azimuth frequency plots or rosettes are used. The determination of the azimuth of the structural dip may be very precise as soon as the dip exceeds a few degrees. The dipmeter analysis involves detecting the deformations of the beds that took place under tectonic stress..

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Authors

  • O. Serra

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