In Situ stresses in the southern Bonaparte Basin, Australia: Implications for first- and second-order controls on stress orientation

Details In Situ stresses in the southern Bonaparte Basin, Australia: Implications for first- and second-order controls on stress orientation In Situ stresses in the southern Bonaparte Basin, Australia: Implications for first- and second-order controls on stress orientation

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3413m&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 20, p. 3413-3416

Physics

Tectonophysics: Plate Boundary-General, Tectonophysics: Stresses-Crust And Lithosphere, Tectonophysics: Stresses-General, Information Related To Geographic Region: Australia

Scientific paper

Four-arm dipmeter logs from six wells and a Formation MicroScanner (FMS) image log from one well in the southern Bonaparte Basin were interpreted for in situ stress indicators. Results of the analysis reveal a consistent NE-SW in situ maximum horizontal stress (σHmax) orientation (055°N). This orientation is parallel to the average σHmax determined in the northern Bonaparte Basin, the onshore Canning Basin, and in New Guinea. The data support the interpretation that the NE-SW σHmax orientation in the area reflects a first-order stress pattern controlled by plate boundary forces along the northeastern margin of the Indo-Australian Plate (IAP) and contradict the suggestion that NE-SW σHmax in the northern Bonaparte Basin is a second-order effect associated with boundary induced flexural stresses. Numerical modeling suggests that the divergence of σHmax from an orientation parallel to plate motion can be explained by the heterogeneous nature of the northeastern boundary of the IAP.

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