Acoustical Imaging and Mechanical Properties of Soft Rock and Marine Sediments Progress Report: July-September 2002

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During the seven quarter of the project the research team analyzed some of the acoustic velocity data and rock deformation data. The goal is to create a series of ''deformation-velocity maps'' which can outline the types of rock deformational mechanisms which can occur at high pressures and then associate those with specific compressional or shear wave velocity signatures. During this quarter, we began to analyze both the acoustical and deformational properties of the various rock types. Some of the preliminary velocity data from the Danian chalk will be presented in this report. This rock type was selected for the initial … continued below

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19 pages

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Scott, Thurman E., Jr.; Abousleiman, Younane & Zaman, Musharraf November 18, 2002.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 41 times. More information about this report can be viewed below.

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During the seven quarter of the project the research team analyzed some of the acoustic velocity data and rock deformation data. The goal is to create a series of ''deformation-velocity maps'' which can outline the types of rock deformational mechanisms which can occur at high pressures and then associate those with specific compressional or shear wave velocity signatures. During this quarter, we began to analyze both the acoustical and deformational properties of the various rock types. Some of the preliminary velocity data from the Danian chalk will be presented in this report. This rock type was selected for the initial efforts as it will be used in the tomographic imaging study outlined in Task 10. This is one of the more important rock types in the study as the Danian chalk is thought to represent an excellent analog to the Ekofisk chalk that has caused so many problems in the North Sea. Some of the preliminary acoustic velocity data obtained during this phase of the project indicates that during pore collapse and compaction of this chalk, the acoustic velocities can change by as much as 200 m/s. Theoretically, this significant velocity change should be detectable during repeated successive 3-D seismic images. In addition, research continues with an analysis of the unconsolidated sand samples at high confining pressures obtained in Task 9. The analysis of the results indicate that sands with 10% volume of fines can undergo liquefaction at lower stress conditions than sand samples which do not have fines added. This liquefaction and/or sand flow is similar to ''shallow water'' flows observed during drilling in the offshore Gulf of Mexico.

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19 pages

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OSTI as DE00813452

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  • Other Information: PBD: 18 Nov 2002

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  • November 18, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • June 28, 2019, 2:34 p.m.

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Thumbnail image of item number 1 in: 'Acoustical Imaging and Mechanical Properties of Soft Rock and Marine Sediments Progress Report: July-September 2002'.
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Scott, Thurman E., Jr.; Abousleiman, Younane & Zaman, Musharraf. Acoustical Imaging and Mechanical Properties of Soft Rock and Marine Sediments Progress Report: July-September 2002, report, November 18, 2002; United States. (https://digital.library.unt.edu/ark:/67531/metadc740431/: accessed June 7, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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