Method for performing a morphological survey of geological formations traversed by a borehole

A method of morphologically surveying geological formations traversed by a borehole, comprising the steps of:

• constructing an initial image of a wall of the borehole representative of variations in a physical parameter of the formation in a longitudinal direction of the borehole (“depth”) and in a peripheral direction of the borehole wall (“laterally”), the initial image comprising image components which extend at least partially across the initial image of said parameter;
• constructing from the initial image a “crossing-component image” which includes only those image components that extend completely laterally across the initial image from one side of the initial image to the other;
• and
• determining variations in at least one attribute relating to said parameter in the crossing-component image as a function of depth, said a least one attribute being selected to distinguish formations of different morphologies said variations vs. depth thereby providing information relating to morphology of the formation.