Present-day stress orientation in Brunei: a snapshot of ‘prograding tectonics’ in a Tertiary delta

Tingay, Mark; Hillis, Richard R.; Morley, C.K.; Swarbrick, Richard E.; Drake, Stephen J.

doi:10.1144/0016-764904-017

Cited by 76 publications

(80 citation statements)

References 23 publications

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“…The NE-SW maximum horizontal stress in the outer shelf most likely reflects this active deltaic gravity spreading tectonics and is decoupled from the far-field NW-SE maximum horizontal stress by overpressured basal shales (Tingay et al, 2005b;Tingay et al, 2007;Tingay et al, 2009b). Furthermore, gravity spreading tectonics is typically linked to margin-perpendicular compression in the delta toe, and has been suggested to further contribute towards the NW-SE maximum horizontal stress orientation observed in the Baram Deepwater stress province ).…”

Section: Accepted M Manuscriptmentioning

confidence: 97%

“…The NW-SE present-day stress direction is similar to the ESE absolute plate motion, and thus the stress orientation may result from a combination of multiple plate boundary forces (Tingay et al, 2005b). In particular, a present-day NW-SE maximum horizontal stress may be generated by forces resulting from the eastern Himalayan syntaxis as well as active subduction under Sulawesi and the Philippines (Figure 1; Tingay et al, 2005b).…”

Section: Borehole Breakouts and Drilling-induced Fractures From The Bmentioning

confidence: 97%

“…In particular, a present-day NW-SE maximum horizontal stress may be generated by forces resulting from the eastern Himalayan syntaxis as well as active subduction under Sulawesi and the Philippines (Figure 1; Tingay et al, 2005b). In addition, some authors have suggested that far-field NW-SE compression throughout Numerous mechanisms have been suggested for this uplift, including buoyant rebound of partially subducted continental crust (Hutchinson, 2004); partial delamination of a thickened mantle lithospheric keel (Hall and Morley, 2004), and; detachment of the lithospheric slab that was subducted underneath Northwest Borneo during the Oligocene and Early Miocene (Morley and Back, 2008).…”

Section: Borehole Breakouts and Drilling-induced Fractures From The Bmentioning

confidence: 99%

“…As discussed above, the NW-SE maximum horizontal stress orientation in the Baram inner shelf and deepwater stress provinces is thought to primarily reflect far-field stresses. However, the outer shelf region of the Baram Delta system is an area of active margin-parallel extensional faulting that is generated by the shape of the deltaic wedge (Tingay et al, 2005b;Morley, 2007b).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Present-day stress field of Southeast Asia

et al. 2010

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It is now well established that ridge push forces provide a major control on the plate-scale stress field in most of the Earth's tectonic plates. However, the Sunda plate that comprises much of Southeast Asia is one of only two plates not bounded by a major spreading centre and thus provides an opportunity to evaluate other forces that control the intraplate stress field. The Cenozoic tectonic evolution of the Sunda plate is usually considered to be controlled by escape tectonics associated with India-Eurasia collision. However, the Sunda plate is bounded by a poorly understood and complex range of convergent and strike-slip zones and little is known about the effect of these other plate boundaries on the intraplate stress field in the region. We compile the first extensive stress dataset for Southeast Asia, A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTthe radiating stress patterns arising from the eastern Himalayan syntaxis. However, the present-day maximum horizontal stress is primarily oriented NW-SE in Borneo, a direction that may reflect plate-boundary forces or topographic stresses exerted by the central Borneo highlands. Furthermore, the South and Central Sumatra Basins exhibit a NE-SW maximum horizontal stress direction that is perpendicular to the Indo-Australian subduction front. Hence, the plate-scale stress field in Southeast Asia appears to be controlled by a combination of Himalayan orogeny-related deformation, forces related to subduction (primarily trench suction and collision) and intraplate sources of stress such as topography and basin geometry.

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Section: Accepted M Manuscriptmentioning

confidence: 97%

Section: Borehole Breakouts and Drilling-induced Fractures From The Bmentioning

confidence: 97%

Section: Borehole Breakouts and Drilling-induced Fractures From The Bmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Present-day stress field of Southeast Asia

et al. 2010

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“…Such releases would be very difficult to contain. A broach can occur at some distance from the wellhead, such as during the 1969 Santa Barbara blowout (7), the 2008 Tordis, North Sea incident (8), and the 1974 and 1979 Campion Field, Brunei blowouts (9). A broach can also occur close to the wellhead.…”

Section: Geologic Setting and Risks Of Shutting In The Wellmentioning

confidence: 99%

Scientific basis for safely shutting in the Macondo Well after the April 20, 2010Deepwater Horizonblowout

Hickman

Hsieh

Mooney

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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As part of the government response to the Deepwater Horizon blowout, a Well Integrity Team evaluated the geologic hazards of shutting in the Macondo Well at the seafloor and determined the conditions under which it could safely be undertaken. Of particular concern was the possibility that, under the anticipated high shut-in pressures, oil could leak out of the well casing below the seafloor. Such a leak could lead to new geologic pathways for hydrocarbon release to the Gulf of Mexico. Evaluating this hazard required analyses of 2D and 3D seismic surveys, seafloor bathymetry, sediment properties, geophysical well logs, and drilling data to assess the geological, hydrological, and geomechanical conditions around the Macondo Well. After the well was successfully capped and shut in on July 15, 2010, a variety of monitoring activities were used to assess subsurface well integrity. These activities included acquisition of wellhead pressure data, marine multichannel seismic profiles, seafloor and water-column sonar surveys, and wellhead visual/acoustic monitoring. These data showed that the Macondo Well was not leaking after shut in, and therefore, it could remain safely shut until reservoir pressures were suppressed (killed) with heavy drilling mud and the well was sealed with cement. In mid-June, a Well Integrity Team (WIT) was created to make recommendations to the government on whether a shut in of the Macondo Well could be safely undertaken and if so, under what conditions. The WIT consisted of the authors of this paper plus engineers from the Department of Energy National Laboratories: Sandia, Los Alamos, and Lawrence Livermore. Although the WIT analyzed both the geologic environment of the Macondo Well and the hydraulic and mechanical performance of engineered components of the well (wellhead, casing flow paths, rupture disks, etc.), this paper deals only with geologic aspects of well integrity. In this paper, we summarize the WIT's assessment of the geologic risks of shutting in the Macondo Well and provide analyses of wellhead pressure and geophysical monitoring data during shut in. These analyses were essential for determining whether the capping stack, when closed, could remain safely shut until the well was killed. Geologic data analyzed by the WIT came from the Macondo Well and nearby wells (including relief wells) and consisted of in situ stress and fluid pressure measurements, geophysical logs, core, cuttings, and gas analyses, 3D and 2D seismic lines, seafloor bathymetry, water-column imagery, sidescan sonar surveys, and drilling records. Extensive discussions were also carried out with scientists and engineers from BP, industry experts, and other federal agencies and academia on lithologic and structural interpretations, reservoir and geomechanical analyses, oceanographic conditions, and well kill and cementing procedures.

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