In situstresses and natural fractures in the Northern Perth Basin, Australia
| Autor: | Rosalind King, Scott D. Reynolds, Richard R. Hillis |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
geography
geography.geographical_feature_category Borehole Magnitude (mathematics) Fault (geology) Structural basin Overburden pressure Stress (mechanics) Earth and Planetary Sciences (miscellaneous) Range (statistics) Perpendicular General Earth and Planetary Sciences Geotechnical engineering Geomorphology Geology |
| Zdroj: | Australian Journal of Earth Sciences. 55:685-701 |
| ISSN: | 1440-0952 0812-0099 |
| DOI: | 10.1080/08120090801982843 |
| Popis: | Present-day stress orientations in the Northern Perth Basin have been inferred from borehole breakouts and drilling-induced tensile fractures observed on image logs from eight wells. Stress indicators from these wells give an east – west maximum horizontal stress orientation, consistent with stress-field modelling of the Indo-Australian Plate. Previous interpretations using dipmeter logs indicated anomalous north-directed maximum horizontal stress orientations. However, higher-quality image logs indicate a consistent maximum horizontal stress orientation, perpendicular to dominant north – south and northwest – southeast fault trends in the basin. Vertical stress was calculated from density logs at 21.5 MPa at 1 km depth. Minimum horizontal stress values, estimated from leak-off tests, range from 7.4 MPa at 0.4 km to 21.0 MPa at 0.8 km depth: the greatest values are in excess of the vertical stress. The maximum horizontal stress magnitude was constrained using the relationship between the minimum and maxim... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|