The Australian stress map

Hillis, Richard R.; Meyer, Jeremy J.; Reynolds, Scott

doi:10.1071/eg998420

Cited by 72 publications

(84 citation statements)

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“…Mean is the mean S Hmax calculated for a region, R is the length of the vector resulting from the sum of all S Hmax orientations within a region (Mardia, 1972), SD is the standard deviation of the calculated mean S Hmax , Conf. is the confidence that the null hypothesis that stress orientation is random can be rejected at, Type is the stress province type as per the methodology of Hillis and Reynolds (2000; (Korsch & Harrington 1987, Murray et al 1987, Korsch et al 1990b, Offler & Foster 2008. However structural analysis of outcrops within the interior of the Texas Orocline suggests that not all of the curvature observed can be attributed to later deformation, and consequently the NEO developed as a partially curved orogenic belt .…”

Section: Declaration By Authormentioning

confidence: 99%

“…b) Location of basement intersecting wells and the intersected basement formation according to the well completion reports. These wells overlie the basement interpretation according to core analysis conducted by (Heidbach et al , 2010 and epicentre locations for seismic events M ≥ 4 since 1970. b) Modelled stress orientations and magnitude from finite element modelling by Reynolds et al (2002Reynolds et al ( , 2003 overlying stress trajectory map by Hillis & Reynolds (2000. c) Modelled stress orientations from modelling by Müller et al (2012).…”

Section: Declaration By Authormentioning

confidence: 99%

“…In order to test variations in stress orientation with basement lithology, wells were also subdivided into three regions based on the underlying basement lithology (Lachlan/Thomson Orogens, Taroom Trough and New England Orogen; Figure 3.3), and the Rayleigh test was applied to each of these regions. The regions were then classified into 6 types using the following criteria: a type 1 region can reject the null hypothesis that stress orientations are random at the 99.9% confidence interval; a type 2 region can reject the null hypothesis at the 99% confidence interval; a type 3 region at the 97.5% interval; a type 4 region at the 95% interval; a type 5 at the 90% interval; and a type 6 region suggests that the null hypothesis cannot be rejected at the 90% interval (Hillis & Reynolds 2000. Table 3.4 shows the results of the Rayleigh test as applied to the mean S Hmax orientations from A to C quality BO and DITF measurements as per the methodology of Reynolds (2000, 2003)Mean statistics were also calculated using the average S Hmax for each well, and using all BO and DITF measurements (A to E quality) as comparisons.…”

Section: Regional Variations In Horizontal Differential Stress and Ormentioning

confidence: 99%

“…According to the methodology of Hillis & Reynolds (2000, Rayleigh analysis designates the Surat Basin as a type 6 stress province. This result suggests that over the entire study area, there is minimal horizontal stress anisotropy, and consequently, local structure is more influential than the far field plate boundary forces on the in situ stress field.…”

Section: The Surat Basin As An Australian Stress Provincementioning

confidence: 99%

“…Following the methodology used by Hillis & Reynolds (2000, the Rayleigh Test was applied to the individual stress orientation data identified in all 36 wells, in order to determine the confidence of stress orientations within the study area (Mardia 1972) (Table 3.4). In order to test variations in stress orientation with basement lithology, wells were also subdivided into three regions based on the underlying basement lithology (Lachlan/Thomson Orogens, Taroom Trough and New England Orogen; Figure 3.3), and the Rayleigh test was applied to each of these regions.…”

Section: Regional Variations In Horizontal Differential Stress and Ormentioning

confidence: 99%

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Subsurface architecture of the Texas Orocline and its influence on in situ stresses in the overlying Surat Basin

Brooke-Barnett¹

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Abstract:The New England Orogen in eastern Australia is a curved orogenic belt, with the Texas orocline being the most prominent curvature. The majority of the Texas Orocline lies beneath Permian to Mesozoic sedimentary basins (Bowen and Surat basins), which inhibit primary observation of the three-dimensional geometry of the orocline and its possible tectonic origin. The Bowen and Surat basins have recently been the target of coal seam gas exploration and production. Coal seam permeability is primarily influenced by fracture/cleat interaction with in-situ stresses. Permeability distribution appears primarily influenced by first order crustal scale structuring regardless of whether structures intersect actual coal bearing basins or whether structures terminate below the producing basins.The apparent influence of crustal structures, stress and ultimately coal permeability highlight the need for studies on the crustal architecture and its influence on the in situ stresses within the overlying basins. Consequently this thesis presents geophysical and well data that constrain the geometry and evolution of the Texas Orocline under the sedimentary cover, and characterize in situ stresses in the overlying basins.2D seismic, aeromagnetic TMI and Bouguer Gravity are used to identify the depth to the New England "basement" and to locate significant faults intersecting it. These data are used to produce a structural interpretation of the curved New England Orogen below cover, as well as a tectonic model for its formation. The orientation and magnitude of in situ stresses with relation to basement structures are mapped across the Surat Basin using wireline log data. The stress state ii across the entire Surat Basin is observed as highly variable, with a mean E-W maximum horizontal stress orientation. Locally, stresses rotate from WNW-ESE over the Lachlan and Thomson Orogens on the western margin of the study area, to NW-SE over the New England Orogen on the eastern margin of the study area. This is in stark contrast to previous studies of the stress state in the Bowen Basin to the north, which exhibits a consistent NNE-SSW maximum horizontal stress orientation. Differential tectonic stress is observed to increase with proximity to basement intersecting faults (Leichhardt-Burunga Fault System) and areas of uplifted basement. Additionally, Andersonian tectonic regimes are observed to change with depth from reverse, to strike-slip, to normal where sedimentary cover is thickest. This stress field complexity is attributed to complex boundary forces associated with Indo-Australian Plate collision being preferentially transmitted within basement lithology over basin lithology due to basement exhibiting a higher rigidity. Local structure is more influential than plate boundary forces on the in situ stress state of the study area due to its location within an "area of divergence" in the Brooke-Barnett, S., Flottmann, T., Paul, P. K., Busetti, S., Hennings, P., Reid, R., Rosenbaum, G. (2015). Influence of basement structures on in si...

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Section: Declaration By Authormentioning

confidence: 99%

Section: Declaration By Authormentioning

confidence: 99%

Section: Regional Variations In Horizontal Differential Stress and Ormentioning

confidence: 99%

Section: The Surat Basin As An Australian Stress Provincementioning

confidence: 99%

Section: Regional Variations In Horizontal Differential Stress and Ormentioning

confidence: 99%

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Subsurface architecture of the Texas Orocline and its influence on in situ stresses in the overlying Surat Basin

Brooke-Barnett¹

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Stress‐induced seismic azimuthal anisotropy in the upper crust across the North West Shelf, Australia

Gavin

Lumley

2016

JGR Solid Earth

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Seismic azimuthal anisotropy (SAA) is observed in many areas of the Earth, and fast polarized directions (ϕ) have been mapped using earthquake surface waves and teleseismic S wave splitting over large regional and tectonic scales. Higher‐resolution petroleum exploration data, including 3‐D seismic surveys and dipole shear logs, often exhibit azimuthal anisotropy; however, we are unaware of any published studies mapping SAA from exploration‐scale data to study large‐scale regional and tectonic SAA trends. The physical mechanisms causing SAA in earthquake data are a subject of great interest; comparing regional ϕ trends to the higher‐resolution exploration trends may help understand these mechanisms. We present a SAA analysis using seismic exploration data across the North West Shelf (NWS) of Australia. We map the fast polarization directions ϕ from 34 dipole shear logs and two 3‐D seismic surveys and compare them to in situ maximum horizontal stress orientations (σH). Our results show that the ϕ and σH trends correlate across a geographical area spanning almost 2000 km and are similar to published results in the region from earthquake seismology. These results suggest that differential horizontal stress is the likely mechanism causing SAA at a wide range of spatial scales on the NWS of Australia. We also show that SAA is not observed at exploration scales in some areas of the NWS and propose a lithology‐dependent stress sensitivity model in which SAA is strongest in clean, unconsolidated quartz‐dominated sandstones and weaker or nonexistent in well‐consolidated cemented rocks and shale‐dominated sediments.

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Contemporary tectonic stress pattern of the Taranaki Basin, New Zealand

et al. 2016

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The present‐day stress state is a key parameter in numerous geoscientific research fields including geodynamics, seismic hazard assessment, and geomechanics of georeservoirs. The Taranaki Basin of New Zealand is located on the Australian Plate and forms the western boundary of tectonic deformation due to Pacific Plate subduction along the Hikurangi margin. This paper presents the first comprehensive wellbore‐derived basin‐scale in situ stress analysis in New Zealand. We analyze borehole image and oriented caliper data from 129 petroleum wells in the Taranaki Basin to interpret the shape of boreholes and determine the orientation of maximum horizontal stress (SHmax). We combine these data (151 SHmax data records) with 40 stress data records derived from individual earthquake focal mechanism solutions, 6 from stress inversions of focal mechanisms, and 1 data record using the average of several focal mechanism solutions. The resulting data set has 198 data records for the Taranaki Basin and suggests a regional SHmax orientation of N068°E (±22°), which is in agreement with NW‐SE extension suggested by geological data. Furthermore, this ENE‐WSW average SHmax orientation is subparallel to the subduction trench and strike of the subducting slab (N50°E) beneath the central western North Island. Hence, we suggest that the slab geometry and the associated forces due to slab rollback are the key control of crustal stress in the Taranaki Basin. In addition, we find stress perturbations with depth in the vicinity of faults in some of the studied wells, which highlight the impact of local stress sources on the present‐day stress rotation.

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The Australian stress map

Cited by 72 publications

References 1 publication

Subsurface architecture of the Texas Orocline and its influence on in situ stresses in the overlying Surat Basin

Subsurface architecture of the Texas Orocline and its influence on in situ stresses in the overlying Surat Basin

Stress‐induced seismic azimuthal anisotropy in the upper crust across the North West Shelf, Australia

Contemporary tectonic stress pattern of the Taranaki Basin, New Zealand

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