The Role of Shear Failure on Stress Characterization

Chan, Alvin W.; Hauser, Matt R.; Couzens-Schultz, Brent A.; Gray, George R.

doi:10.1007/s00603-014-0585-x

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…This is interpreted to result from the creation of a small tensile fracture (Bell 1996a). However, observations indicate that also shear failure could be initiated by increasing the wellbore pressure, particularly in active thrust belts (Chan et al 2014;Couzens-Schultz and Chan 2010;Zhang et al 2011). For our compilation we keep the conventional assumption of tensile failure creation.…”

Section: Loading Methodsmentioning

confidence: 99%

An open-access stress magnitude database for Germany and adjacent regions

Morawietz

Heidbach

Reiter³

et al. 2020

Geotherm Energy

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Knowledge of the crustal stress state is important for the assessment of subsurface stability. In particular, stress magnitudes are essential for the calibration of geomechanical models that estimate a continuous description of the 3-D stress field from pointwise and incomplete stress data. Well established is the World Stress Map Project, a global and publicly available database for stress orientations, but for stress magnitude data only local data collections are available. Herein, we present the first comprehensive and open-access stress magnitude database for Germany and adjacent regions, consisting of 568 data records. In addition, we introduce a quality ranking scheme for stress magnitude data for the first time.

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Section: Loading Methodsmentioning

confidence: 99%

An open-access stress magnitude database for Germany and adjacent regions

Morawietz

Heidbach

Reiter³

et al. 2020

Geotherm Energy

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“…The relative magnitudes of the three principal stresses define a stress regime (Anderson, 1951) (Figure 3); under any given stress regime, the type of failure defined will typically dominate (Heidbach & H€ ohne, 2008;Sibson, 1977). For further information regarding the definition of lithospheric stresses, see Bell (1990), Bell (1996aBell ( , 1996b, Bell (2003), Chan et al (2014), Couzens-Schultz and Chan (2010), Plumb et al (2000) and Zoback (2007).…”

Section: Introductionmentioning

confidence: 99%

Understanding present-day stress in the onshore Canning Basin of Western Australia

Bailey

Jarrett

Tenthorey

et al. 2021

Australian Journal of Earth Sciences

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Western Australia's Canning Basin is an underexplored prospective basin with proven petroleum systems and small-scale production. Recently, several formations within deeper depocentres have been investigated for unconventional hydrocarbon resources. Modern petroleum resource evaluation generally depends on an understanding of local and regional stresses that are a primary control over the formation and propagation of induced fractures. There are significant gaps in our understanding of these factors within the Canning Basin. This study characterises the regional stress regime of the onshore Canning Basin and presents modelled present-day stress, allowing for the identification of significant stress heterogeneity and natural fracture barriers. Interpretation of wireline data reveals a present-day state of stress with variation in magnitude and faulting-type. An approximately northeast-southwest regional present-day maximum horizontal stress orientation is interpreted, which is in broad agreement with the Australian Stress Map and previously published data. One-dimensional mechanical earth models, constructed for intervals from 15 Canning Basin wells, highlight the relationship between lithology and stress. Significant changes in stress within and between lithological units, owing to the existence of discrete mechanical units forming numerous inter-and intra-formational stress boundaries, likely to act as natural barriers to fracture propagation, particularly within those units currently targeted for their unconventional resource potential, are interpreted. A strikeslip faulting stress regime is interpreted broadly through the basin. However, when analysed in detail there are three distinct stress zones identified: (1) a transitional reverse-to strike-slip faulting stress regime in the top $1 km, (2) a strike-slip faulting stress regime from $1 km to $3.0 km and (3) a transitional strike-slip to normal faulting regime at depths greater than $3.0 km. This study is a component of the Australian Government's Exploring for the Future initiative, which focusses on gathering new data and information about northern Australia's resource potential. KEY POINTS 1. New stress data, including 15 mechanical earth models, are presented for Western Australia's onshore Canning Basin. 2. Broadly, a strike-slip stress regime with a NE-SW-oriented maximum horizontal orientation is described. 3. Significant stress heterogeneities and natural fracture barriers are identified.

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“…It has been suggested that pre-existing fractures intersecting the borehole can affect LOTs. Where cohesion is low, fractures may experience shear slip allowing for leak-off, giving abnormally low values of s H (Bailey et al, 2016;Chan, Hauser, Couzens-Schultz, & Gray, 2014;Couzens-Schultz & Chan, 2010;Gjønnes, Cruz, Horsrud, & Holt, 1998;King et al, 2012). We consider the first scenario to be more likely, i.e.…”

Section: Diagnosis Of Stress Regimementioning

confidence: 99%

Characterising the present-day stress regime of the Georgina Basin

Bailey

Tenthorey

Ayling

2017

Australian Journal of Earth Sciences

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The onshore Georgina Basin in northern Australia is prospective for unconventional hydrocarbons; however, like many frontier basins, it is underexplored. A well-connected hydraulic fracture network has been shown to be essential for the extraction of resources from the tight reservoirs that categorise unconventional plays, as they allow for economic flows of fluid from the reservoir to the well. One of the fundamental scientific questions regarding hydraulic stimulation within the subsurface of sedimentary basins is the degree to which local and regional tectonic stresses act as a primary control on fracture propagation. As such, an understanding of present-day stresses has become increasingly important to modern petroleum exploration and production, particularly when considering unconventional hydrocarbon reservoirs. This study characterises the regional stress regime in the Georgina Basin using existing well data. Wellbore geophysical logs, including electrical resistivity image logs, and well tests from 31 petroleum and stratigraphic wells have been used to derive stress magnitudes and constrain horizontal stress orientations. Borehole failure features interpreted from wellbore image and caliper logs yield a maximum horizontal stress orientation of 044 N. Integration of density log data results in a vertical stress gradient of 24.6 MPa km-1. Leak-off and mini-fracture tests suggest that this is the minimum principal stress, as leak-off values are generally shown to be at or above the magnitude of vertical stress. The maximum horizontal stress gradient is calculated to be in the range of 31.3-53.9 MPa km-1. As such, a compressional stress regime favouring reverse/reverse-strike-slip faulting is interpreted for the Georgina Basin.

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The Role of Shear Failure on Stress Characterization

Cited by 7 publications

References 4 publications

An open-access stress magnitude database for Germany and adjacent regions

An open-access stress magnitude database for Germany and adjacent regions

Understanding present-day stress in the onshore Canning Basin of Western Australia

Characterising the present-day stress regime of the Georgina Basin

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