Petrophysical investigation on sediment core CRP-3 from the Ross Sea, Antarctica
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2001
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| _version_ | 1867171355537965056 |
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| author | Jarrard, Richard D |
| author_facet | Jarrard, Richard D |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A suite of petrophysical properties - velocity, resistivity, bulk density, porosity, and matrix density - was measured on 88 core plugs from the CRP-3 drillhole. Core-plug bulk densities were used to recalibrate both whole-core and downhole bulk density logs. Core-plug measurements of matrix density permit conversion of the whole-core and downhole bulk density logs to porosity. Both velocity and formation factor (a normalized measure of resistivity) are strongly correlated with porosity. The velocity/porosity pattern is similar to that for the lower part of CRP-2A and is consistent with the empirical relationship for sandstones. Core-plug and whole-core measurements of P-wave velocity at atmospheric pressure exhibit excellent agreement. Measurements of velocity as a function of pressure indicate a significantly higher velocity sensitivity to pressure than has been observed at CRP-1 and CRP-2A; rebound or presence of microcracks at CRP-3 may be responsible. The percentage difference between velocities at in situ pressures and atmospheric pressures increases downhole from 0% at the seafloor to 9% at the bottom. This pattern can be used to correct whole-core velocity data, measured at atmospheric pressure, to in situ velocities for depth-to-time conversion and associated comparison to the seismic profile across the drillsite |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_510758 |
| institution | PANGAEA |
| language | en |
| publishDate | 2001 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Petrophysical investigation on sediment core CRP-3 from the Ross Sea, Antarctica Jarrard, Richard D Cape Roberts Project; Core wireline system; CRP; CRP-3; CRP-3__Campaign; CWS; Ross Sea; Sampling/drilling from ice A suite of petrophysical properties - velocity, resistivity, bulk density, porosity, and matrix density - was measured on 88 core plugs from the CRP-3 drillhole. Core-plug bulk densities were used to recalibrate both whole-core and downhole bulk density logs. Core-plug measurements of matrix density permit conversion of the whole-core and downhole bulk density logs to porosity. Both velocity and formation factor (a normalized measure of resistivity) are strongly correlated with porosity. The velocity/porosity pattern is similar to that for the lower part of CRP-2A and is consistent with the empirical relationship for sandstones. Core-plug and whole-core measurements of P-wave velocity at atmospheric pressure exhibit excellent agreement. Measurements of velocity as a function of pressure indicate a significantly higher velocity sensitivity to pressure than has been observed at CRP-1 and CRP-2A; rebound or presence of microcracks at CRP-3 may be responsible. The percentage difference between velocities at in situ pressures and atmospheric pressures increases downhole from 0% at the seafloor to 9% at the bottom. This pattern can be used to correct whole-core velocity data, measured at atmospheric pressure, to in situ velocities for depth-to-time conversion and associated comparison to the seismic profile across the drillsite |
| title | Petrophysical investigation on sediment core CRP-3 from the Ross Sea, Antarctica |
| topic | Cape Roberts Project; Core wireline system; CRP; CRP-3; CRP-3__Campaign; CWS; Ross Sea; Sampling/drilling from ice |
| url | https://doi.org/10.1594/PANGAEA.510758 |