Stress‐induced borehole elongation: A comparison between the four‐arm dipmeter and the borehole televiewer in the Auburn Geothermal Well

Plumb, R.A.; Hickman, Stephen H.

doi:10.1029/jb090ib07p05513

Cited by 385 publications

(202 citation statements)

References 7 publications

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“…Another problem in constraining the stress state in the deepest section of Hole 504B is that the borehole elongations are inferred from Formation MicroScanner (FMS) 4-arm caliper data, which has been shown previously to be less sensitive to the presence of borehole elongation than is data from the borehole televiewer (Plumb and Hickman, 1985). Thus some elongations may have been missed, resulting in an over estimate of the borehole stability.…”

Section: In Situ Stress At Site 504mentioning

confidence: 99%

Relationships between Strengths and Physical Properties of Samples Recovered during Legs 137, 140, and 148 from Hole 504B

Moos¹,

Pézard²

1996

Proceedings of the Ocean Drilling Program, 148 Scientific Results

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We have measured the unconfined strength and the tangent Young's modulus under uniaxial loading conditions of 16 minicores sampled from material recovered over the interval 1500-2100 mbsf from Ocean Drilling Program Hole 504B during Legs 137, 140, and 148. Relationships between strength and physical properties such as porosity and density are similar to those of rocks sampled at shallower depth in the same hole. However, trends in these data are different from those predicted from analysis of cores from other boreholes drilled into crust significantly older than that at Site 504. This agrees with several studies which demonstrate that changes in crustal properties with age continue to occur even in much older crust. Relationships between rock strength and electrical properties such as formation factor are tenuous, in part because of the fairly narrow range of properties of these rocks. Observation of tensile failure in 4-arm caliper logs in the deepest section of Hole 504B, and a relative lack of compressional breakouts, may be an indication of a strike-slip stress regime, in contrast to a shallower strike-slip/ reverse faulting regime inferred previously. However, stress magnitudes in the deeper sections of Hole 504B should not be quantified solely on the basis of these core measurements and on elongations detected in 4-arm caliper logs, because of the poor sample coverage, the lack of sensitivity of the caliper log to breakouts when compared to a borehole televiewer, and the possible influence of drilling-induced microcracks on the core properties.

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Section: In Situ Stress At Site 504mentioning

confidence: 99%

Relationships between Strengths and Physical Properties of Samples Recovered during Legs 137, 140, and 148 from Hole 504B

Moos¹,

Pézard²

1996

Proceedings of the Ocean Drilling Program, 148 Scientific Results

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“…Both zones indicate the azimuth of breakout in the borehole that deviated angle is less than 0.25 (Figures 2a and 2b). These elongations correspond to cease the tool rotation in the zone of borehole enlargement [see, e.g., Plumb and Hickman, 1985]. The washout zone was reported in the depth 1560-1580 mbsf which implied the borehole enlargement at the all azimuth.…”

Section: Borehole Condition and Stress Orientation At Site C0009mentioning

confidence: 99%

Stress state estimation by geophysical logs in NanTroSEIZE Expedition 319‐Site C0009, Kumano Basin, southwest Japan

Kinoshita

Yukitoshi

2012

Geophysical Research Letters

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To understand the stress regime in the shallow portion of the Nankai Trough seismogenic zone, we carefully investigated the resistivity image logs at IODP Site C0009 that penetrated to 1600 meters below the sea floor (mbsf) in the central Kumano forearc basin. During the riser drilling, several downhole measurements were run including image logs, caliper and comprehensive geophysical logs sets. Borehole resistivity images obtained by a wireline‐logging tool were reprocessed in order to eliminate image artifacts generated by sticky tool movements, etc. The constraints on the possible magnitude and orientation of horizontal principal stresses are provided from the borehole images, rock strength, and logging data. The absence of borehole breakouts above 1285 mbsf represents a small difference (<10 MPa) between horizontal principal stresses and reflects the normal faulting and strike–slip faulting stress regimes. A stable, continuous breakout was observed in the resistivity image logs suggest that the stress state is in a strike–slip faulting and tending to reverse faulting regime below 1285 mbsf. The differential horizontal stress (up to 15 MPa) is significantly larger than in the shallow portion of the borehole (SHAMX ≫ Sv > Shmin).

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“…An older tool, the BoreHole Tele Viewer (Zemanek et al, 1970a;Zemanek et al, 1970b), turned out to be more suited to these studies (Newmark et al, 1984;Newmark et al, 1985b;Zoback et al, 1985;Morin et al, 1989) because it provides higher resolution measurement of the borehole shape and was used to confirm elongations inferred from caliper data (Plumb and Hickman, 1985).…”

Section: Hole Geometry Methodology and Purposementioning

confidence: 99%

“…However, most atten- tion has recently focused on the relationship between the anisotropy of the horizontal state of stress and a particular type of borehole elongation termed breakouts. Breakouts are characterized by seven conditions: they were defined by Babcock (1978) as zones (1) of elongation, that is, where one diameter is significantly greater than the other (by at least 1 cm), (2) that begin and end abruptly, (3) that persist for a significant depth interval (larger than the pad height), (4) that slow or stop the natural clockwise rotation of the tool, and (5) where the smallest measured caliper is equal to the drill-bit size; Plumb and Hickman (1985) added that breakouts (6) are of symmetrical elongation and (7) correspond to high electrical conductivity zones. Breakouts have been shown on three main grounds to be induced by remote anisotropic stress concentration around the borehole.…”

Section: Hole Geometry Methodology and Purposementioning

confidence: 99%

“…The FMS and BHTV also provide borehole diameter measurements that can be used to identify breakouts (Newmark et al, 1984;Newmark et al, 1985b;Zoback et al, 1985;Hickman et al, 1985;Plumb and Hickman, 1985); these breakouts, when stress induced, indicate the directions of the horizontal principal stress (Hottman et al, 1979, Bell andGough, 1979) and hence constrain the present tectonic regime.…”

Section: Logging For Tectonics In Hess Deepmentioning

confidence: 99%

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Constraints on the Geometry and Fracturing of Hole 894G, Hess Deep, from Formation MicroScanner Logging Data

Célérier¹,

Macleod²,

Harvey³

1996

Proceedings of the Ocean Drilling Program, 147 Scientific Results

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Ocean Drilling Program Hole 894G, sited on a small horst within Hess Deep, was drilled in lower oceanic crust that was generated at the East Pacific Rise and then rifted by the propagating Cocos/Nazca divergent plate boundary. Difficult drilling conditions in fractured gabbros resulted in a washed-out hole.Despite these unfavorable circumstances, open-hole logs from the Formation MicroScanner (FMS) tool string provide strong constraints on the fracture orientations and suggest a few directions of preferential enlargement. These results were obtained because five logging passes were recorded to compensate for the expected low data quality by redundancy and because the now classical analysis of FMS data has been adapted to this situation of multiple passes and washed out borehole.An east enlargement direction is thought to be related to the east-west strike of the dense network of fractures observed both in cores and on the FMS resistivity images, and an east-northeast enlargement direction may be the result of drill pipe wear along the borehole plunge direction. Additional east-southeast to south-southeast and north-northeast enlargements may reflect the influence of either the Nazca-Galapagos or the Cocos-Nazca plate boundary state of stress, respectively. However, the interpretation of these poorly defined directions remains uncertain.The analysis of the FMS resistivity images shows mainly east-west striking and southward dipping fractures and very few north-south trending features. This suggests a strong Cocos-Nazca control on brittle deformation in the Hess Deep. The distribution of orientation of the fractures identified on the FMS images is very similar to that obtained from core veins reoriented relative to paleomagnetic north. Matching the two sets requires that the remanent magnetization direction points north-northwest. The preferred interpretation of this result is a vertical-axis component of tectonic rotation of 30° to 40° counterclockwise.

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Stress‐induced borehole elongation: A comparison between the four‐arm dipmeter and the borehole televiewer in the Auburn Geothermal Well

Cited by 385 publications

References 7 publications

Relationships between Strengths and Physical Properties of Samples Recovered during Legs 137, 140, and 148 from Hole 504B

Relationships between Strengths and Physical Properties of Samples Recovered during Legs 137, 140, and 148 from Hole 504B

Stress state estimation by geophysical logs in NanTroSEIZE Expedition 319‐Site C0009, Kumano Basin, southwest Japan

Constraints on the Geometry and Fracturing of Hole 894G, Hess Deep, from Formation MicroScanner Logging Data

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