Topic
Core sample
About: Core sample is a research topic. Over the lifetime, 1046 publications have been published within this topic receiving 11364 citations. The topic is also known as: drill core.
Papers published on a yearly basis
1 / 2
Papers
Patent•
29 Dec 1983TL;DR: In this article, a core sample is scanned with a computerized axial tomographic scanner (CAT) to determine the attenuation coefficients at a plurality of points along the core sample.
Abstract: A method of correlating a core sample with its original position in a borehole. The borehole is logged to determine the bulk density of the formation surrounding the borehole. The core sample is scanned with a computerized axial tomographic scanner (CAT) to determine the attenuation coefficients at a plurality of points in a plurality of cross sections along the core sample. The bulk density log is then compared with the attenuation coefficients to determine the position to which the core sample correlates in the borehole. Alternatively, the borehole can be logged to determine the photoelectric absorption of the formation surrounding the borehole, and this log can be compared with data derived from scanning the core sample with a CAT at two different energy levels.
275 citations
Patent•
29 Dec 1983TL;DR: In this paper, a core sample is collected from the borehole for scanning by a computerized axial tomographic scanner (CAT) to determine the attenuation coefficients at a plurality of points in a cross section of the core sample.
Abstract: A method of determining the invasion of drilling fluid into a core sample taken from a borehole. A first material is added to the drilling fluid to obtain a first fluid that has an effective atomic number that is different than the effective atomic number of the connate fluids in the rock formation surrounding the borehole. A preserved core sample is collected from the borehole for scanning by a computerized axial tomographic scanner (CAT) to determine the attenuation coefficients at a plurality of points in a cross section of the core sample. The preserved core sample is scanned with a CAT at first and second energies, and the determined attenuation coefficients for the plurality of points in the cross section at each energy are used to determine an atomic number image for the cross section of the core sample. The depth of invasion of the first fluid is then determined from the atomic number image, as an indication of the depth of invasion of the drilling fluid into the core sample.
268 citations
TL;DR: In this paper, an instrument was designed to obtain a core 1 m long and 5 cm diam, and to include a few centimeters of water above the sediment surface so that the position of the sediment-water interface can be determined with accuracy.
Abstract: The instrument described has been designed to obtain a core 1 m long and 5 cm diam, and to include a few centimeters of water above the sediment surface so that the position of the sediment-water interface can be determined with accuracy. The meter long core provides sufficient overlap with the longer cores to allow measurements to be continued without interruption to the present sediment surface. The ability to obtain undisturbed cores of the upper meter of sediment also has considerable value in the examination of changes in sedimentary composition resulting from relatively recent alteration in the trophic status of lakes.
266 citations
TL;DR: In this paper, an approach for calculating the pore-water compositions of clayrocks from laboratory-measured properties of core samples, including their leachable Cl and SO4 concentrations and analysed exchangeable cations, and from mineral and cation exchange equilibria based on the formation mineralogy is presented.
219 citations
Patent•
1 May 1981TL;DR: In this article, a system for measuring ultrasonic (50 Khz-10 Mhz) velocity and attenuation in core samples employs transmitting and receiving transducers for generating and receiving ultrasonic energy in a core sample.
Abstract: A system for measuring ultrasonic (50 Khz-10 Mhz) velocity and attenuation in core samples employs transmitting and receiving transducers for generating and receiving ultrasonic energy in a core sample. The transducer and core sample are contained in a high pressure cell. The transducers are isolated from the high pressure of the cell by suitable housings, allowing the transducers to operate at ambient pressure.
187 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 11 |
| 2024 | 9 |
| 2023 | 26 |
| 2022 | 44 |
| 2021 | 22 |
| 2020 | 38 |