Image log analysis of in situ stress orientation, breakout growth, and natural geologic structures to 2.5km depth in central Scandinavian Caledonides: Results from the COSC-1 borehole

摘要

Stress-induced borehole deformation analysis in the Collisional Orogeny in the Scandinavian Caledonide deep scientific borehole establishes in situ stress orientation in a poorly characterized region in central Sweden. Two acoustic televiewer logging campaigns, with more than 1year between campaigns, provide detailed images along the full length of the 2.5km deep borehole for breakout, drilling-induced tensile fracture (DITF), and natural occurring structural analysis. Borehole breakouts occur in 13 distinct zones along total length of 22m, indicating an average maximum horizontal stress, S-Hmax, orientation of 127 degrees 12 degrees. Infrequent DITFs are constrained within one zone from 786 to 787m depth (S-Hmax orientation: 121 degrees 07 degrees). These S-Hmax orientations are in agreement with the general trend in Scandinavia and are in accordance with many mechanisms that generate crustal stress (e.g., ridge push, topographic loading, and mantel driven stresses). The unique acquisition of image logs in two successions allows for analysis of time-dependent borehole deformation, indicating that six breakout zones have crept, both along the borehole axis and radially around the borehole. Strong dynamic moduli measured on core samples and an inferred weak in situ stress anisotropy inhibit the formation of breakouts and DITFs. Natural fracture orientation below 800m is congruent to extensional or hybrid brittle shear failure along the same trend as the current S-Hmax. Analysis of foliation in the image logs reinforces the interpretation that the discontinuous seismic reflectors with fluctuating dip observed in seismic profiles are due to recumbent folding and boudinage.