Abstract: A process for processing a dipmeter curve is shown in the preferred embodiment. In a curve, line segments are drawn between curve minima, a second set of line segments are drawn between minima in the first segments, and this is repeated to desired number of levels. When finished, line segments are numbered and become a branched tree. This tree is reorganized to form an event tree which is easily coverted into a stored digital value and is processed for correlation with other curves. The events are reduced in number by using area and length criteria. Correlation is limited to a selected range of shift centered on either zero dip or dip from nearby formation information.

Abstract: A process for processing a dipmeter curve is shown in the preferred embodiment. In a curve, line segments are drawn between curve minima, a second set of line segments are drawn between minima in the first segments, and this is repeated to desired number of levels. When finished, line segments are numbered and become a branched tree. This tree is reorganized to form an event tree which is easily converted into a stored digital value and is processed for correlation with other curves.

Abstract: An improved method and apparatus for correlating logging curves particularly adapted to formation dip determination from wire line dip meter measurements. A plurality of data sets each having a corresponding formation resistivity logging curve associated therewith are generated from a borehole. An activity transform function is derived from each data set, the maxima above a predetermined noise level of which are utilized to determine a set of possible points on the respective logging curve for correlation with points on another such curve. The set of points is reduced in size according to criteria requiring all possible correlated point-pairs to be separated in depth by no more than a predetermined maximum search interval, and on respective curve segments having the same slope sign and shape, wherein the shape criterion is a function of the activity.

Abstract: A plurality of formation resistivity logging data sets are generated along a borehole. From the data formation dip values are preliminarily determined at different elevations along the borehole. The dip values are combined for each borehole elevation of interest in a functional relationship utilizing a variable scatter parameter related to dip direction and magnitude variations whereby the resulting dip value at each elevation is taken as the corrected value. The variable scatter parameter may be selectively varied to produce variable representations as desired of formation dip, including visual representations. These variable representations may range from those excluding dip data points inconsistent with prevailing geological interpretation patterns and thereby exhibiting progressively less scatter to those representations including more available and possible dip values with scatter to be interpreted.