Significance of Deep Sea drilling project sediment physical property data

Demars, Kenneth R.; Nacci, V.A.

doi:10.1080/10641197809379799

Cited by 13 publications

(12 citation statements)

References 9 publications

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“…The test results are limited, but they provide information on the effects of sampling disturbance (swelling and remolding) on the physical properties measurements. Laboratory investigations provide an advantage over shipboard testing by controlling the state of stress and the void ratio, thereby providing a baseline for comparing data on swollen and disturbed samples obtained on board (Demars and Nacci, 1978).…”

Section: Laboratory Measurementsmentioning

confidence: 99%

“…This behavior is typical of remolded samples (Schmertman, 1955). Remolding tends to obliterate stress history and aging effects (bonding) and provides slightly lower compression indices than in undisturbed samples (Demars and Nacci, 1978).…”

Section: Consolidation Testsmentioning

confidence: 99%

“…This technique produced some disturbance in recovered core samples (Demars and Nacci, 1978). A number of studies have addressed physical property measurements of these relatively disturbed samples, including Boyce (1974), Hamilton (1976), Bennett and Keller (1973), and Demars and Nacci (1978).…”

Section: Introductionmentioning

confidence: 99%

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Geotechnical Engineering Characterization of Hydraulically Piston-Cored Deep Ocean Sediments

Walton¹,

Sangrey²,

Miller³

1983

Initial Reports of the Deep Sea Drilling Project, 72

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The hydraulic piston coring device (HPC-15) allows recovery of deep ocean sediments with minimal disturbance. The device was used during Leg 72 of the Deep Sea Drilling Project (DSDP) aboard the Glomar Challenger. Core samples were recovered from bore holes in the Rio Grande Rise in the southwest Atlantic Ocean. Relatively undisturbed sediment cores were obtained from Holes 515A, 516, 517, and 518. The results of shipboard physical property measurements and on-shore geotechnical laboratory tests on these cores are presented in this chapter.A limited number of 0.3 m cores were obtained and used in a series of geotechnical tests, including one-dimensional consolidation, direct shear, Atterburg limit, particle size analysis, and specific gravity tests. Throughout the testing program, attention was focused on assessment of sample disturbance associated with the HPC-15 coring device.The HPC-15 device limits sample disturbance reasonably well in terrigenous muds (clays). However, sample disturbance associated with coring calcareous sediments (nannofossil-foraminifer oozes) is severe. The noncohesive, granular behavior of the calcareous sediments is vulnerable to severe disturbance, because of the design of the sampling head on the device at the time of Leg 72.A number of modifications to the sampling head design are recommended and discussed in this chapter. The modifications will improve sample quality for testing purposes and provide longer unbroken core samples by reducing friction between the sediment column and the sampling tool.

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Section: Laboratory Measurementsmentioning

confidence: 99%

Section: Consolidation Testsmentioning

confidence: 99%

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Geotechnical Engineering Characterization of Hydraulically Piston-Cored Deep Ocean Sediments

Walton¹,

Sangrey²,

Miller³

1983

Initial Reports of the Deep Sea Drilling Project, 72

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“…Both methods for evaluation of mass physical property data are subject to errors. Laboratory measurements on retrieved cores are affected by drilling disturbance and rebound (e.g., Demars and Nacci, 1978, Nichols, 1980, Karig and Salisbury, 1986. Rebound results from the release of overburden stress, which allows expansion of the drilled sediments.…”

Section: Introductionmentioning

confidence: 99%

“…However, the effects of rebound can be evaluated by compression tests in shore-based laboratory studies (Demars andNacci, 1978, Marine Geotechnical Consortium, 1986); the sample is compressed by known different stresses and its response is recorded. If the overburden effective stress is applied, porosity values lower than in-situ are obtained as stated by Schmertmann (1955).…”

Section: Introductionmentioning

confidence: 99%

Comparison between Laboratory-Determined Physical Properties and Downhole Measurements in Outer Bengal Fan Deposits

Wetzel¹,

Williams²,

Kassens³

et al. 1990

Proceedings of the Ocean Drilling Program

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Mass physical property data determined aboard ship and by downhole logging correlate to a varying degree with each other depending on lithology and the parameter determined.Compressional-wave velocity values determined on board are of low reliability because they are heavily affected by drilling disturbance. The disturbance is probably related to the opening of microcracks during drilling. For porosity (and inversely related wet-bulk density) the pattern of divergence between laboratory and downhole measurements seems to be related to lithology. Major differences between on-board and in-situ determinations occur in mud-dominated intervals and are probably due to inaccurate logging measurements. These probably result from tool stand-off in the soft sediments rather than mineralogical effects.The sonic log-derived porosities appear to be accurate, independent of lithology, although this conclusion must remain tentative because of poor core recovery within the silt-rich turbidite intervals. An independent check of the accuracy of the various techniques for measuring porosity and wet-bulk density is provided by the compression test results. These results are in good agreement with all logging data in silt-dominated intervals and in good agreement with sonic log data and laboratory data only in the mud-dominated sections. These results indicate that, until the techniques for eccentering the neutron and density tools are improved, only the sonic and resistivity logs should be used for porosity determinations in these high-porosity sediments. Because the applicability of the resistivity and sonic-velocity transforms for logging signals remain uncertain, core measurements are necessary for calibrations.

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Non-Invasive Sediment Monitoring Methods

Ortiz

Rack²

1999

Reconstructing Ocean History

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Significance of Deep Sea drilling project sediment physical property data

Cited by 13 publications

References 9 publications

Geotechnical Engineering Characterization of Hydraulically Piston-Cored Deep Ocean Sediments

Geotechnical Engineering Characterization of Hydraulically Piston-Cored Deep Ocean Sediments

Comparison between Laboratory-Determined Physical Properties and Downhole Measurements in Outer Bengal Fan Deposits

Non-Invasive Sediment Monitoring Methods

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