Figure 19

Illustration of the manner in which fault offsets can be diagnosed through observations of well casing shear (from Hilbert et al., 1998). Left Panel: Photograph of sheared casing recovered from a well crossing an active fault in the Wilmington Field, CA (after Frame, 1952). Center Panel: Geometry used in finite-element modeling of casing shear. Right Panel: Comparison between observed and modeled casing shear resulting from compaction-induced faulting in a sandstone/shale/diatomite sequence overlying a petroleum reservoir at South Belrdige, CA. Casing deformation was measured using a deviation log and a multifinger caliper log.