Density/Porosity Versus Velocity of Overconsolidated Sands Derived from Experimental Compaction

Narongsirikul, Sirikarn; Mondol, Nazmul Haque; Jahren, Jens

doi:10.3997/2214-4609.20130755

Cited by 4 publications

(7 citation statements)

References 4 publications

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“…; Narongsirikul et al . ). Table describes the mineralogical composition, grain size, grain shape, and sorting of the selected database.…”

Section: Discussionmentioning

confidence: 97%

“…The brine‐saturated sand–kaolinite mixtures match with compaction trend for a natural quartz arenite (grey dashed line) suggested by Narongsirikul et al . ().…”

Section: Discussionmentioning

confidence: 99%

“…; Narongsirikul et al . ) revealed that the degree of mechanical compaction as a function of effective stress can be greatly influenced by the mineralogy of the constituent grains and textural parameters of the rock such as grain size, grain shape, and sorting. Those earlier tests were performed by controlling the grain size, shape, and sorting of tested samples, but with lack of control on mineralogy since the tested samples were natural sands and shaly sands.…”

Section: Introductionmentioning

confidence: 98%

“…; Narongsirikul et al . ) and also synthetic samples of sand–kaolinite mixtures (Marion et al . ; Yin ; Chuhan et al .…”

Section: Introductionmentioning

confidence: 99%

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Experimental mechanical compaction of sands and sand–clay mixtures: a study to investigate evolution of rock properties with full control on mineralogy and rock texture

Zadeh

Mondol

Jahren

2016

Geophysical Prospecting

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Development of rock physical properties in well‐sorted and poorly‐sorted unconsolidated mono‐quartz sands and sand–clay mixtures as a function of effective stress in both dry and brine‐saturated conditions is assessed in this study. The tested samples were prepared with full control on their mineralogy, grain size, grain shape, sorting, and fabric. The experiments were performed in a high‐stress uniaxial oedometer up to a maximum of 30 MPa vertical effective stress. Sand–clay samples were a mixture of sand grains and clay particles (kaolinite or smectite) in different proportions. The maximum clay volume fraction used in the experiments was at most 30%. The initial bulk density of the tested sand‐dominated samples was adjusted to be close to the maximum index density expected for natural sediments (sand–clay mixtures) during deposition. In pure sand samples, finer grained sand show higher initial porosity than relatively coarser grained sands. Moreover, sand–clay mixtures have lower initial porosity than pure sands. Porosity decreases as a function of increasing clay content. The poorly‐sorted sand samples are less compaction prone than the well‐sorted sand samples. Among well‐sorted sand samples, coarser grained sands are more compressible than finer grained sands. At a given effective stress level, sand–clay mixtures are more compaction prone compared with their sand component alone. Pure sands and clay‐poor sand–clay mixtures (either sand–kaolinite or sand–smectite) show almost the same degree of compaction when tested in both dry and brine‐saturated conditions. In contrast, clay‐rich sand–kaolinite and sand–smectite mixtures (clay volume >20%) are significantly more compact in brine‐saturated condition. The Vp values of brine‐saturated sand–kaolinite mixtures shows a positive correlation with the kaolinite content, whereas Vp starts to decrease substantially when the volume fraction of smectite exceeds 10% of the whole sand–smectite samples. Saturated bulk moduli estimated by Gassmann's fluid substitution agree with measurements for brine‐saturated clay‐poor sand samples. However, the model does not yield proper predictions for sand–clay samples containing 20% clay volume and above, particularly when the clay is mainly smectite. The acoustic and physical properties derived from experimental compaction of pure sands and sand–clay mixtures show a good agreement with rock properties derived from well logs of mechanically compacted pure sands and shaly sands in progressively subsided basins such as Viking Graben in the North Sea. Thus, the outcome of this study can provide reliable constraints for rock physical properties of sands and shaly sands within the mechanical compaction domain and contribute to improved basin modelling and identification of hydrocarbon presence, overconsolidation, and/or undercompaction.

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“…; Narongsirikul et al . ). Table describes the mineralogical composition, grain size, grain shape, and sorting of the selected database.…”

Section: Discussionmentioning

confidence: 97%

“…The brine‐saturated sand–kaolinite mixtures match with compaction trend for a natural quartz arenite (grey dashed line) suggested by Narongsirikul et al . ().…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

“…; Narongsirikul et al . ) and also synthetic samples of sand–kaolinite mixtures (Marion et al . ; Yin ; Chuhan et al .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental mechanical compaction of sands and sand–clay mixtures: a study to investigate evolution of rock properties with full control on mineralogy and rock texture

Zadeh

Mondol

Jahren

2016

Geophysical Prospecting

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show abstract

“…In addition, in the past few years, several experimental approaches have been developed with the aim of understanding the effects of complex burial histories or stress paths on rock properties, for example using rock physics modelling (e.g. Grude Landrø and Osdal ; Narongsirikul Mondol and Jahren –c; Draege et al . ; Avseth and Lehocki ) and experimental compaction studies (Nygård et al .…”

Section: Introductionmentioning

confidence: 99%

Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results

Narongsirikul

Mondol

Jahren

2019

Geophysical Prospecting

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This paper part one is set out to lay primary observations of experimental compaction measurements to form the basis for rock physics modelling in paper part two. P‐ and S‐wave velocities and corresponding petrophysical (porosity and density) properties of seven unconsolidated natural sands with different mineralogical compositions and textures are reported. The samples were compacted in a uniaxial strain configuration from 0.5 up to 30 MPa effective stresses. Each sand sample was subjected to three loading cycles to study the influence of stress reduction on acoustic velocities and rock physical properties with the key focus on simulating a complex burial history with periods of uplift. Results show significant differences in rock physical properties between normal compaction and overconsolidation (unloaded and reloaded). The differences observed for total porosity, density, and P‐ and S‐wave velocities are attributed to irrecoverable permanent deformation. Microtextural differences affect petrophysical, acoustic, elastic and mechanical properties, mostly during normal consolidation but are less significant during unloading and reloading. Different pre‐consolidation stress magnitudes, stress conditions (isotropic or uniaxial) and mineral compositions do not significantly affect the change in porosity and velocities during unloading as a similar steep velocity–porosity gradient is observed. The magnitude of change in the total porosity is low compared to the associated change in P‐ and S‐wave velocities during stress release. This can be explained by the different sensitivity of the porosity and acoustic properties (velocities) to the change in stress. Stress reduction during unloading yields maximum changes in the total porosity, P‐ and S‐wave velocities of 5%, 25%, and 50%, respectively. These proportions constitute the basis for the following empirical (approximation) correlations: Δϕ ∼ ±5 ΔVP and ΔVP ∼ ±2ΔVS. The patterns observed in the experiments are similar to well log data from the Barents Sea. Applications to rock physics modelling and reservoir monitoring are reported in a companion paper.

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Mechanical Review of Fine Sand-Clay Varians

Muhammad Shalahuddin,

Andre Novan,

Safridatul 'Audah

et al. 2023

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Clay in nature consist of a mixture of grains and minerals with or without the content of organic matter. The variation in the size of clay grains and the proportion of their distribution is a very useful indicator for knowing soil behavior. Testing the combination of fine sand - clay (FSC) using clay from Kulim Pekanbaru and fine sand from Teratak Buluh Riau. Variants of the percentage of FSC are carried out with the types of tests carried out are Standard Proctor Test, Unconfined Compressive strength test, Direct Shear Test and sieve analysis test and hydrometer. Increasing the percentage of clay in the FSC variant, increases the liquid limit, increasses the plastic limit and increases the plasticity index. Increases optimum moisture content, decreases maximum dry density and increases soil friction angle and decreases compressive strength

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Density/Porosity Versus Velocity of Overconsolidated Sands Derived from Experimental Compaction

Cited by 4 publications

References 4 publications

Experimental mechanical compaction of sands and sand–clay mixtures: a study to investigate evolution of rock properties with full control on mineralogy and rock texture

Experimental mechanical compaction of sands and sand–clay mixtures: a study to investigate evolution of rock properties with full control on mineralogy and rock texture

Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results

Mechanical Review of Fine Sand-Clay Varians

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