Changes

|}

|}

Borehole images are normally displayed in a depth and [[azimuth]] reference system, which corresponds to the projection of the cylindrical surface of a drill core onto a plane that is split by tradition along magnetic north. In this projection, an inclined planar feature such as a bedding surface, fracture, or fault shows up as a sinusoid. The minimum, or trough, of a sinusoid points in the direction of the dip azimuth, while the amplitude (divided by the borehole diameter) indicates the dip angle.

Borehole images are normally displayed in a depth and [[azimuth]] reference system, which corresponds to the projection of the cylindrical surface of a drill core onto a plane that is split by tradition along magnetic north. In this projection, an inclined planar feature such as a bedding surface, fracture, or fault shows up as a sinusoid. The minimum, or trough, of a sinusoid points in the direction of the [[dip]] [[azimuth]], while the amplitude (divided by the borehole diameter) indicates the dip angle.

Most borehole images are digitized, either downhole or uphole, and are thus amenable to digital computer processing such as image enhancement (e.g., filtering, sharpening, and false coloring), higher level image analysis (e.g., feature recognition and extraction), and three-dimensional projections. Interactive graphic workstations are useful tools for manipulating and interpreting borehole images.

Most borehole images are digitized, either downhole or uphole, and are thus amenable to digital computer processing such as image enhancement (e.g., filtering, sharpening, and false coloring), higher level image analysis (e.g., feature recognition and extraction), and three-dimensional projections. Interactive graphic workstations are useful tools for manipulating and interpreting borehole images.