Mineral and Chemical Composition

Pettijohn, F. J.; Potter, Paul Edwin; Siever, Raymond

doi:10.1007/978-1-4612-1066-5_2

Cited by 5 publications

(3 citation statements)

References 108 publications

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“…however, a precise classification of the mineral phase is not possible. Iron oxides are more common in secondary precipitates that usually form during eo-and mesodiagenesis (Pettijohn et al, 1987). The degrading impact of iron-oxide-rich coatings on permeability and porosity in unconsolidated sand and gravel has been shown in studies like Costabel et al (2018).…”

Section: Petrophysical and Geochemical Characteristicsmentioning

confidence: 99%

High-Resolution Analysis of the Physicochemical Characteristics of Sandstone Media at the Lithofacies Scale

Linsel¹,

Wiesler²,

Hornung³

et al. 2020

Preprint

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Abstract. The prediction of physicochemical rock properties in subsurface models regularly suffers from uncertainty observed at the sub-meter scale. Although at this scale – which is commonly termed the lithofacies scale – the physicochemical variability plays a critical role for various types of subsurface utilization, its dependence on syn- and post-depositional processes is still subject to investigation. The impact of syn- and post-depositional geological processes, including depositional dynamics, diagenetical compaction and chemical mass transfer, onto the spatial distribution of physicochemical properties in siliciclastic media at the lithofacies scale is investigated in this study. We propose a new workflow using two cubic rock samples where eight representative geochemical, thermophysical, elastic and hydraulic properties are measured on the cubes' faces and on samples taken from the inside. The scalar fields of the properties are then constructed by means of spatial interpolation. The rock cubes represent the structurally most homogeneous and most heterogeneous lithofacies types observed in a Permian lacustrine delta formation that deposited in an intermontane basin. The spatio-temporal controlling factors are identified by exploratory data analysis and geostatistical modeling in combination with thin section and environmental scanning electron microscopy analyses. Sedimentary structures are well preserved in the spatial patterns of the negatively correlated permeability and mass fraction of Fe2O3. The Fe-rich mud fraction, which builds large amounts of the intergranular rock matrix and of the pseudomatrix, has a degrading effect onto the hydraulic properties. This relationship is underlined by a zonal anisotropy that is connected to the observed stratification. Feldspar alteration produced secondary pore space that is filled with authigenic products including illite, kaolinite and opaque phases. The local enrichment of clay minerals implies a non-pervasive alteration process that is expressed by network-like spatial patterns of the positively correlated mass fractions of Al2O3 and K2O. Those patterns are spatially decoupled from primary sedimentary structures. The elastic properties, namely p- and s-wave velocity, indicate a weak anisotropy that is not inevitably oriented perpendicularly to the sedimentary structures. The multifarious patterns observed in this study emphasize the importance of high-resolution sampling in order to properly model the variability present in a lithofacies-scale system. In fact, the physicochemical variability observed at the lithofacies scale might nearly cover the global variability in a formation. Hence, if the local variability is not considered in full-field projects – where the sampling density is usually low – statistical correlations and thus conclusions about causal relationships among physicochemical properties might be feigned inadvertently.

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Section: Petrophysical and Geochemical Characteristicsmentioning

confidence: 99%

High-Resolution Analysis of the Physicochemical Characteristics of Sandstone Media at the Lithofacies Scale

Linsel¹,

Wiesler²,

Hornung³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…The accuracy is given by the manufacturer to be within ±0.55 % (Micromeritics, 1998). Thermal properties under unsaturated conditions, namely the thermal conductivity and thermal diffusivity, were determined with a thermal conductivity scanner (TCS) according to the work of Popov et al (1999). The measurement error is quantified to be ≤ 3 % for thermal conductivity and ≤ 8 % for thermal diffusivity (Popov et al, 1999).…”

Section: Laboratory Experimentsmentioning

confidence: 99%

“…Thermal properties under unsaturated conditions, namely the thermal conductivity and thermal diffusivity, were determined with a thermal conductivity scanner (TCS) according to the work of Popov et al (1999). The measurement error is quantified to be ≤ 3 % for thermal conductivity and ≤ 8 % for thermal diffusivity (Popov et al, 1999). The elastic properties of P-wave and S-wave velocity in the rock media were measured with the sonic wave generator UKS-D (Geotron Elektronik) by sending a sonic wave pulse from a pulse-providing test head (UPG-S) to a receiver (UPG-E).…”

Section: Laboratory Experimentsmentioning

confidence: 99%

High-resolution analysis of the physicochemical characteristics of sandstone media at the lithofacies scale

et al. 2020

View full text Add to dashboard Cite

Abstract. The prediction of physicochemical rock properties in subsurface models regularly suffers from uncertainty observed at the submeter scale. Although at this scale – which is commonly termed the lithofacies scale – the physicochemical variability plays a critical role for various types of subsurface utilization, its dependence on syndepositional and postdepositional processes is still subject to investigation. The impact of syndepositional and postdepositional geological processes, including depositional dynamics, diagenetic compaction and chemical mass transfer, onto the spatial distribution of physicochemical properties in siliciclastic media at the lithofacies scale is investigated in this study. We propose a new workflow using two cubic rock samples where eight representative geochemical, thermophysical, elastic and hydraulic properties are measured on the cubes' faces and on samples taken from the inside. The scalar fields of the properties are then constructed by means of spatial interpolation. The rock cubes represent the structurally most homogeneous and most heterogeneous lithofacies types observed in a Permian lacustrine-deltaic formation that deposited in an intermontane basin. The spatiotemporal controlling factors are identified by exploratory data analysis and geostatistical modeling in combination with thin section and environmental scanning electron microscopy analyses. Sedimentary structures are well preserved in the spatial patterns of the negatively correlated permeability and mass fraction of Fe2O3. The Fe-rich mud fraction, which builds large amounts of the intergranular rock matrix and of the pseudomatrix, has a degrading effect on the hydraulic properties. This relationship is underlined by a zonal anisotropy that is connected to the observed stratification. Feldspar alteration produced secondary pore space that is filled with authigenic products, including illite, kaolinite and opaque phases. The local enrichment of clay minerals implies a nonpervasive alteration process that is expressed by the network-like spatial patterns of the positively correlated mass fractions of Al2O3 and K2O. Those patterns are spatially decoupled from primary sedimentary structures. The elastic properties, namely P-wave and S-wave velocity, indicate a weak anisotropy that is not strictly perpendicularly oriented to the sedimentary structures. The multifarious patterns observed in this study emphasize the importance of high-resolution sampling in order to properly model the variability present in a lithofacies-scale system. Following this, the physicochemical variability observed at the lithofacies scale might nearly cover the global variability in a formation. Hence, if the local variability is not considered in full-field projects – where the sampling density is usually low – statistical correlations and, thus, conclusions about causal relationships among physicochemical properties might be feigned inadvertently.

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Geochemical constraints on weathering and provenance of stream sediments from Bat Xat, northwestern Vietnam

Tran,

Nguyen,

Pham

et al. 2024

Applied Geochemistry

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Mineral and Chemical Composition

Cited by 5 publications

References 108 publications

High-Resolution Analysis of the Physicochemical Characteristics of Sandstone Media at the Lithofacies Scale

High-Resolution Analysis of the Physicochemical Characteristics of Sandstone Media at the Lithofacies Scale

High-resolution analysis of the physicochemical characteristics of sandstone media at the lithofacies scale

Geochemical constraints on weathering and provenance of stream sediments from Bat Xat, northwestern Vietnam

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