Patent ID: 6192316
Filing Date: 2001-02-20
Classification: G01V

Abstract:
A method of operating a computer to analyze a set of well log signals to identify fracture formations along a wellbore, the well log signals corresponding to Stoneley waves generated by a source in a well log tool at a plurality of depths in the wellbore, and detected by a plurality of downhole receivers in a well log tool at the plurality of depths, comprising the steps of:selecting at least first and second frequencies of analysis, the first frequency being lower than the second frequency;generating a first reflection coefficient trace corresponding to the reflectivity of Stoneley waves of the first frequency at each of the plurality of depths;generating a second reflection coefficient trace corresponding to the reflectivity of Stoneley waves of the second frequency at each of the plurality of depths; andcomparing the first and second reflection coefficient traces with one another over the plurality of depths, to identify the depths at which fractures and drilling artifacts are present along the wellbore.