ABSTRACT

A six arm electrical borehole imaging tool has recently been developed and field tested in the United States. This tool represents a further advancement in the evolution of electric borehole imaging. Electrode arrays are mounted on six independent arms, providing excellent pad contact. This produces very high resolution images for stratigraphic and structural analysis. This study presents examples of borehole images from different formation types (terrigenous clastics and carbonates) that have been interpreted with assistance of an interactive graphics workstation. These examples show how the user can confidently measure planar and linear features such as strike and dip of bedding, fractures, faults, unconformities, and laminae within individual cross-bedded sets. Examples of borehole images compared to cores illustrate how imaging data can be used to identify rock texture and other sedimentary features needed for detailed stratigraphic analysis and reservoir characterization.

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