Patent ID: 7359845

Claim:
A method of evaluating an earth formation, the method comprising: (a) developing a lithological model of the earth formation from borehole log measurement data comprising; (i) defining a two-dimensional matrix using a plurality of azimuthal sectors around circumference of the borehole and a plurality of measured depths along the borehole; (ii) creating a sectored borehole log value for each element of the matrix based on borehole log measurement data and associating the value with the element; and (iii) contouring the matrix of sectored borehole log values; (b) determining an area of interest delineated by at least one determined contour; (c) determining a lithological property of the earth formation represented by the determined area of interest; (d) rendering a predictive startigraphic image of the area of interest on a display screen using the lithological property around the circumference of the borehole; and (e) storing the determined area of interest and lithological property of the earth formation in computer memory.