Analysis on Earth Stress and Fracture Distribution Characteristics with Image Logging

Abstract

The generation of Damintun Depression base-rock reservoirs are mainly controlled by fracture development. Currently, for the fracture-system space distribution characters, we haven’t understood clearly. Therefore, we must find fracture developing zones and learn their development state in order to study the planar distribution law of factures. The principal stress was calculated and fractures were identified using sonic and electrical image logging data. Combined with the relationship in borehole breakout method that borehole collapse direction was substantially perpendicular to principal stress direction, the modern horizontal principal stress was determined. Then the base-rock fractures were extracted manually in imaging interactive interpretation graphic. Thus the relation is obtained that the maximum horizontal Earth stress direction is vertical to fracture distribution, and the structural-zone faults are consistent with the fracture distribution law.