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  • 1
    Publication Date: 2023-01-30
    Description: The core samples originated from different formations in the Bakken Petroleum System. In this dataset, we provide mineral contents, geophysical measurements, and petrophysical measurements as functions of pressure to characterize the anisotropic behavior of the Bakken Petroleum System cores.
    Keywords: acoustic; Bakken_Petroleum_System_Cores; mineralogy; permeability; porosity; SIDEWALL; Sidewall core; Total Organic Carbon
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 2
    Publication Date: 2023-01-30
    Keywords: acoustic; Bakken_Petroleum_System_Cores; Hydrostatic confining pressure; mineralogy; permeability; Permeability; porosity; Porosity; Sample ID; SIDEWALL; Sidewall core; Total Organic Carbon; Unsteady state pressure decay permeameter and porosimeter
    Type: Dataset
    Format: text/tab-separated-values, 494 data points
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  • 3
    Publication Date: 2023-01-30
    Keywords: acoustic; Bakken_Petroleum_System_Cores; Hydrostatic confining pressure; mineralogy; permeability; porosity; Sample ID; SIDEWALL; Sidewall core; Thomsen's anisotropy parameter, compressional wave; Thomsen's anisotropy parameter, delta; Thomsen's anisotropy parameter, shear wave; Total Organic Carbon
    Type: Dataset
    Format: text/tab-separated-values, 2077 data points
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  • 4
    Publication Date: 2023-02-12
    Keywords: acoustic; Anhydrite; Ankerite; Apatite; Bakken_Petroleum_System_Cores; Barite; Calcite; Carbon; Celestine; Chlorite; Dolomite; Fluorite; Glauconite; Halite; Illite; Ilmenite; Kalifeldspar; Kaolinite; Magnesite; mineralogy; Mixed layer illite/smectite; Muscovite; permeability; Plagioclase; porosity; Pyrite, FeS2; Quantitative Evaluation of Minerals by SCANning electron microscopy (QEMSCAN); Quartz; Rutile; Sample ID; Siderite; SIDEWALL; Sidewall core; Source rock analyzer; Total Organic Carbon; Zircon
    Type: Dataset
    Format: text/tab-separated-values, 624 data points
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  • 5
    Publication Date: 2023-07-10
    Keywords: acoustic; Bakken_Petroleum_System_Cores; Hydrostatic confining pressure; mineralogy; permeability; porosity; Sample ID; SIDEWALL; Sidewall core; Total Organic Carbon; Velocity, compressional wave, 45 degrees to bedding; Velocity, compressional wave, parallel to bedding; Velocity, compressional wave, perpendicular to bedding; Velocity, shear wave, 45 degrees to bedding; Velocity, shear wave, parallel to bedding; Velocity, shear wave, perpendicular to bedding
    Type: Dataset
    Format: text/tab-separated-values, 3298 data points
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  • 6
    Publication Date: 2023-07-10
    Keywords: acoustic; Bakken_Petroleum_System_Cores; Hydrostatic confining pressure; mineralogy; Off-axis stiffness; Parallel to bedding stiffness, compressional wave; Parallel to bedding stiffness, shear wave; permeability; Perpendicular to bedding stiffness, compressional wave; Perpendicular to bedding stiffness, shear wave; porosity; Sample ID; SIDEWALL; Sidewall core; Total Organic Carbon
    Type: Dataset
    Format: text/tab-separated-values, 2830 data points
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  • 7
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    American Association of Petroleum Geologists (AAPG)
    Publication Date: 2011-11-01
    Description: The velocity of elastic waves is the primary datum available for acquiring information about subsurface characteristics such as lithology and porosity. Cheap and quick (spatial coverage, ease of measurement) information of permeability can be achieved, if sonic velocity is used for permeability prediction, so we have investigated the use of velocity data to predict permeability. The compressional velocity from wireline logs and core plugs of the chalk reservoir in the South Arne field, North Sea, has been used for this study. We compared various methods of permeability prediction from velocities. The relationships between permeability and porosity from core data were first examined using Kozeny's equation. The data were analyzed for any correlations to the specific surface of the grain, Sg, and to the hydraulic property defined as the flow zone indicator (FZI). These two methods use two different approaches to enhance permeability prediction from Kozeny's equation. The FZI is based on a concept of a tortuous flow path in a granular bed. The Sg concept considers the pore space that is exposed to fluid flow and models permeability resulting from effective flow parallel to pressure drop. The porosity-permeability relationships were replaced by relationships between velocity of elastic waves and permeability using laboratory data, and the relationships were then applied to well-log data. We found that the permeability prediction in chalk and possibly other sediments with large surface areas could be improved significantly using the effective specific surface as the fluid-flow concept. The FZI unit is appropriate for highly permeable sedimentary rocks such as sandstones and limestones that have small surface areas.
    Print ISSN: 0149-1423
    Electronic ISSN: 0149-1423
    Topics: Geosciences
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  • 8
    Publication Date: 2013-01-30
    Description: ABSTRACT Carbonate rocks are heterogeneous at various levels from deposition to diagenesis. Any existing depositional heterogeneity becomes more complex when carbonate rocks are in contact with polar fluids. Our experiments on carbonate rocks show that change in textural heterogeneity leads to heterogeneity in the distribution of storage and flow properties that may govern changes in saturation patterns. This would be akin to any carbonate reservoir with a mix of heterogeneous and homogeneous facies within a formation and their control on saturation distribution in response to a standard imbibition process. Associated with the saturation pattern heterogeneities, the resultant elastic property distributions also change. We quantify this heterogeneity and its effects on flow and seismic properties based on a few textural extremes of fabric heterogeneity in samples that can exist in any typical carbonate reservoir system. Our measurements show that textural heterogeneity can lead to anisotropy in permeability and in acoustic velocities. Permeability anisotropy measurements varied between 40% and 100% while acoustic velocity anisotropy measurements varied between 8% and 30% with lower values for homogeneous samples respectively. Under similar conditions of the saturation experiment (spontaneous imbibition at the benchtop and undrained pressure imbibition at 1000 psi), the imbibing brine replaced 97% of the pore volume in a homogeneous sample (porosity 20% and permeability 2.6 mD) compared to 80% pore volume in a heterogeneous sample (porosity 29% and permeability 23.4 mD). Furthermore, after pressure saturation, a change of +79% in the bulk modulus and -11% in the shear modulus is observed for homogeneous samples in comparison to +34% in the bulk modulus and −1% in the shear modulus for heterogeneous samples, with respect to the dry state moduli values of the samples. We also examined the uncertainties associated with Gassmann models of elastic properties due to variations in fluid saturations. Our results provide significant information on the saturation and, with it, modulus variations that are often ignored during fluid substitution modelling in time-lapse seismic studies in carbonate reservoirs. We show that the bulk modulus could vary by 45% and the shear modulus by 10% between homogeneous and heterogeneous patches of a reservoir after a water flooding sequence for secondary recovery. Our findings demonstrate the need to incorporate and couple such fabric-controlled saturation heterogeneities in reservoir simulation and in seismic fluid substitution models.
    Print ISSN: 0016-8025
    Electronic ISSN: 1365-2478
    Topics: Geosciences , Physics
    Published by Wiley
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  • 9
  • 10
    Publication Date: 2017-09-19
    Print ISSN: 0016-8033
    Electronic ISSN: 1942-2156
    Topics: Geosciences , Physics
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