Determination of three-dimensional in situ stresses from anelastic strain recovery measurement of cores at great depth

Lin, Weiren; Kwaśniewski, Marek; Imamura, Tetsumi; Matsuki, Koji

doi:10.1016/j.tecto.2006.02.019

Cited by 51 publications

(29 citation statements)

References 22 publications

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“…The direct measurement of maximum horizontal stress magnitude is more difficult, and few tools for this exist (e.g., Moran et al 1993). As a result, indirect approaches have been widely used to estimate in situ horizontal stress orientation and magnitude from wellbore failures and from fault or fracture orientations measured in borehole logging data (e.g., Moos and Zoback 1990;Zoback and Healy 1992;Brudy et al 1997;Zoback 2007;Chang et al 2010;Ito et al 2013;Lin et al 2015) or from anelastic strain recovery measurements on core samples (e.g., Amadei and Stephansson 1997; Lin et al 2006;Byrne et al 2009). Similarly, in situ strength must be inferred indirectly from downhole drilling parameters (e.g., Kerkar et al 2014) or defined from laboratory measurements (e.g., Horsrud 2001; Song et al 2011;Chang et al 2006).…”

Section: Introductionmentioning

confidence: 99%

In situ stress magnitude and rock strength in the Nankai accretionary complex: a novel approach using paired constraints from downhole data in two wells

2016

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We present a method to simultaneously constrain both far-field horizontal stress magnitudes (S hmin and S Hmax ) and in situ rock unconfined compressive strength (UCS), using geophysical logging data from two boreholes located 70 m apart that access the uppermost accretionary prism of the Nankai subduction zone . The boreholes sample the same sediments and are affected by the same tectonic stress field, but were drilled with different annular pressures, thus providing a unique opportunity to refine estimates of both in situ stress magnitudes and rock strength. We develop a forward model to predict the angular width of compressional wellbore failures (borehole breakouts), and identify combinations of S Hmax and UCS that best match breakout widths observed in resistivity images from the two boreholes. The method requires knowledge of S hmin , which is defined by leak-off tests conducted during drilling. Our results define a normal to strike-slip stress regime from 900 to 1386 m below seafloor, consistent with observations from seismic and core data. Our analysis also suggests that in situ values of UCS are generally slightly lower that commonly assumed on the basis of published empirical relations between UCS and P-wave velocity.

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Section: Introductionmentioning

confidence: 99%

In situ stress magnitude and rock strength in the Nankai accretionary complex: a novel approach using paired constraints from downhole data in two wells

2016

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“…In order to determine in situ stress orientations and to orientations and to s and to estimate magnitudes, we did anelastic strain recovery (ASR) measurement using a few cores by the same method as Lin et al (2006). Because the anelastic strain recovers immediately immediately from the in situ stress released by drilling, the measurements have to be conducted as quickly as possible after retrieving the core sample.…”

Section: Core Handling On the Drilling Sitementioning

confidence: 99%

Core Handling and Real-Time Non-Destructive Characterization at the Kochi Core Center: An Example of Core Analysis from the Chelungpu Fault

Lin¹,

Hirono²,

Yeh³

et al. 2007

Sci. Dril.

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As an example of core analysis carried out inactive fault drilling programs, we report the procedures of core handling on the drilling site and non-destructive characterization in the laboratory. This analysis was employed onthe core samples taken from HoleBof the Taiwan Chelungpu-fault Drilling Project (TCDP), which penetrated through the active fault that slipped during the 1999 Chi-Chi, Taiwan earthquake. We show results of the non-destructive physical property measurements carried out at the Kochi Core Center (KCC), Japan. Distinct anomalies of lower bulk density and higher magnetic susceptibilitywere recognized in all three fault zones encountered in HoleB. To keep the core samples in good condition before they are used for variousanalyses is crucial. In addition, careful planning for core handlingand core analyses is necessary for successfulinvestigations. <br><br> doi:<a href="http://dx.doi.org/:10.2204/iodp.sd.s01.35.2007" target="_blank">:10.2204/iodp.sd.s01.35.2007</a>

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“…These values are very heterogeneous along the fault plane and can be regarded as a lower bound because of the 10 limited spatial resolution of the kinematic models, which is at best a few kilometers. If the shear stress drop may be evaluated, the pre-earthquake and the residual stress levels need to be measured in-situ in deep wells and boreholes by hydraulic fracturing technique and analysis of stress-induced well bore breakouts (Zoback and Healy, 1992) or by anelastic strain recovery measurements on cores retrieved from boreholes (Lin et al, 2006). For example, differential stress measured in the SAFOD pilot hole are ≈60 MPa at 1671m depth (Hickman and Zoback, 2004).…”

Section: Introductionmentioning

confidence: 99%

High stresses stored in fault zones: example of the Nojima fault (Japan)

Boullier¹,

Robach²,

Ildefonse³

et al. 2017

Preprint

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Abstract. During the last decade pulverized rocks have been described on outcrops along large active faults and attributed to damage related to a propagating seismic rupture front. Questions remain on the maximal lateral distance from the fault plane and maximal depth for dynamic damage to be imprinted in rocks. In order to document these questions, a core sample of granodiorite located at 51.3 m from the Nojima fault (Japan) that was drilled after the Hyogo-ken Nanbu (Kobe) earthquake is studied by using Electron Back-Scattered Diffraction (EBSD) and high resolution X-ray Laue 15 microdiffraction. Although located outside of the Nojima damage fault zone and macroscopically undeformed, the sample shows pervasive microfractures and local fragmentation that are attributed to the first stage of seismic activity along the Nojima fault characterized by laumontite as the main sealing mineral. EBSD mapping was used in order to characterize the crystallographic orientation and deformation microstructures in the sample, and X-ray microdiffraction to measure elastic strain and residual stresses in a quartz grain. Both methods give consistent results on the crystallographic orientation and 20show small and short wave-length misorientations associated with laumontite-sealed microfractures and alignments of tiny fluid inclusions. Deformation microstructures in quartz are symptomatic of the semi-brittle faulting regime, in which low temperature brittle, plastic deformation and stress-driven dissolution-deposition processes occur conjointly.Residual stresses are calculated from elastic strain measured by X-ray Laue microdiffraction and stress peaks at 100 MPa (mean 141 MPa). Such stress values are comparable to the peak strength of a damaged granodiorite from the damage zone 25 of the Nojima fault indicating that, although apparently macroscopically undeformed, the sample is actually highly damaged. The homogeneously distributed microfracturing of quartz is the microscopically visible imprint of this damage and suggests that high stresses were stored in the whole sample and not only concentrated on some crystal defects. It is proposed that the high residual stresses are the sum of the stress fields associated with individual dislocations, dislocation microstructures and originated from the dynamic damage related to the propagation of rupture fronts or seismic waves 30 associated to M6 to M7 earthquakes during Paleocene on the Nojima fault at a 3.7 -11.1 km depth (laumontite stability domain) where confining pressure prevented pulverization. The high residual stresses and the deformation microstructures Solid Earth Discuss., https://doi

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Determination of three-dimensional in situ stresses from anelastic strain recovery measurement of cores at great depth

Cited by 51 publications

References 22 publications

In situ stress magnitude and rock strength in the Nankai accretionary complex: a novel approach using paired constraints from downhole data in two wells

In situ stress magnitude and rock strength in the Nankai accretionary complex: a novel approach using paired constraints from downhole data in two wells

Core Handling and Real-Time Non-Destructive Characterization at the Kochi Core Center: An Example of Core Analysis from the Chelungpu Fault

High stresses stored in fault zones: example of the Nojima fault (Japan)

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