Multi-Sensor-Core-Logger (MSCL)
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Sprache:Englisch
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Family Sharing
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Erscheinungsdatum
25.04.2014
Verlag
GRINSeitenzahl
19 (Printausgabe)
Dateigröße
1128 KB
Auflage
1. Auflage
Sprache
Englisch
EAN
9783656644842
Internship Report from the year 2013 in the subject Geography / Earth Science - Miscellaneous, grade: 2,3, RWTH Aachen University (Lehrstuhl für Geologie, Geochemie und Lagerstätten des Erdöls und der Kohle), course: Petrophysics Practical Course, language: English, abstract: The MSCL-experiment encloses the stepwise measurement of three different
parameters: Gamma density, P-wave-velocity (compressional wave travel time) and
magnetic susceptibility. Each is measured by different sensors. A photo of the
apparatus is shown in figure 1. The four core samples G1, a black stone, coarse-grained and compacted with small
mica particles and bigger white quartz inclusions, could be a gabbro and G2 a
greenish sandstone with small particles and lesser compaction, each unsaturated
and saturated with water are halved and "transported on a stepper motor-driven
tracking system" to the sensors. If the rock sample is heterogeneous and the halves
don't accord in their mineral composition, you will have now a potential error source.
The samples are laid on the tracking system. A motor pushes them first to a laser,
where the length is measured, than to the gamma source and then to the P-wavevelocity-
sensor. Here you have a second potential error source: When the P-wavevelocity-
sensor presses the samples down for measuring, they were lift on the other
side. To avoid the lifting the rock samples have to be pressed and so the
measurements are not really accurate. [...]
parameters: Gamma density, P-wave-velocity (compressional wave travel time) and
magnetic susceptibility. Each is measured by different sensors. A photo of the
apparatus is shown in figure 1. The four core samples G1, a black stone, coarse-grained and compacted with small
mica particles and bigger white quartz inclusions, could be a gabbro and G2 a
greenish sandstone with small particles and lesser compaction, each unsaturated
and saturated with water are halved and "transported on a stepper motor-driven
tracking system" to the sensors. If the rock sample is heterogeneous and the halves
don't accord in their mineral composition, you will have now a potential error source.
The samples are laid on the tracking system. A motor pushes them first to a laser,
where the length is measured, than to the gamma source and then to the P-wavevelocity-
sensor. Here you have a second potential error source: When the P-wavevelocity-
sensor presses the samples down for measuring, they were lift on the other
side. To avoid the lifting the rock samples have to be pressed and so the
measurements are not really accurate. [...]
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