Rock Acoustics of Diagenesis and Cementation

Carcione, José M.; Gei, Davide; Picotti, Stefano; Qadrouh, Ayman N.; Alajmi, Mamdoh; Ba, Jing

doi:10.1007/s00024-022-03016-w

Cited by 4 publications

(2 citation statements)

References 40 publications

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“…By combining the CCT, HM, and HS models as well as including the intergranular volume index (IGV) for pressure effects, a patchy cement model , has been developed to predict stress dependence in poorly consolidated sandstones with weak cementation. A comprehensive comparison of various analytical models can be referred to the work of Carcione et al (2022) . It should be stressed that the CCT model is based on the grain-to-grain direct contact with a small cemented contact region.…”

Section: Introductionmentioning

confidence: 99%

“…A comprehensive comparison of various analytical models can be referred to the work of Carcione et al (2022). 14 It should be stressed that the CCT model is based on the grain-tograin direct contact with a small cemented contact region. Unconsolidated sandstones with weak cementation are usually characteristic of nonzero contact thickness between adjacent grains, which will reduce the normal and tangential stiffnesses.…”

Section: Introductionmentioning

confidence: 99%

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Grain-Level Numerical Simulations for the Effective Elasticity of Weakly Cemented Sandstones

2023

ACS Omega

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Weakly cemented sandstones are characteristic of loose-bonding contacts, large porosities, and high-clay contents. This study presents a discrete element method (DEM)-based numerical study for the effective elasticity of such rocks that mainly depends on the mechanical behavior of intergranular contact regions. The DEM scheme employs a set of normal and shear springs to phenomenologically describe the mechanical behavior of intergranular finite-sized cements defined by three morphological parameters: cement thickness, bonding radius, and grain radius. Applications to two digital models established in terms of contact-bonding and distant-bonding modes, respectively, where spherical quartz grains are randomly packed together with adding cements under the specified confining pressure, are compared with the theoretical predictions by the contact-bonding and distant-bonding cement theories, which demonstrates a good agreement generally for small contact widths, small contact thicknesses, and large-magnitude moduli, especially for the effective shear modulus. Applications to a series of artificial sandstone samples made in terms of different proportions of quartz grains and clays (a mixture of epoxy and kaolinite) under loose compaction for weak cementation demonstrate a good agreement with ultrasonic measurements. Numerical investigations for the micromechanical characteristics (differential stress fields, force chains, and fabric tensors) of artificial samples subject to applied axial strains demonstrate that the strong mechanical behavior of weakly cemented sandstones tends to appear inside the cohesive aggregates of stiff grains because of their relatively large sizes with loose compaction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Grain-Level Numerical Simulations for the Effective Elasticity of Weakly Cemented Sandstones

2023

ACS Omega

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Petro-physical Characterization of the Shallow Sediments in a Coastal Area in NE Italy from the Integration of Active Seismic and Resistivity Data

et al. 2023

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Integrated geophysical analysis using different methods along with a priori information from wells, is a proven approach to investigate the geology and the petro-physical characteristics of subsoil. We collected seismic and geoelectric data in an area located on the Adriatic coast in North-Eastern Italy, aimed at characterizing the quaternary sediments and the shallow geological structures. Compressional and shear-wave data provided information about geometry and velocity of the quaternary sedimentary succession, while geoelectric data provided information about the resistivity in the shallower formation, which strongly depends on the presence of groundwater (brine) and on its salinity. Clustering analysis allowed us to subdivide the study area into subdomains showing similar values of resistivity and compressional- and shear-wave velocity, enabling for a better interpretation of the processed seismic sections. Then, we calculated the petro-physical properties of the investigated sediments, i.e., brine saturation and resistivity, porosity, and clay content, for each cluster. This inverse problem involves rock-physics theories and an optimization algorithm based on the simulated annealing global-search method. The results, validated using borehole stratigraphy, provided information about the salty water wedge intrusion.

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Surface flaking mechanism of stone components of ancient building complex in Wudang Mountain, China

Wang

Chen

Wang

2023

Construction and Building Materials

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Rock Acoustics of Diagenesis and Cementation

Cited by 4 publications

References 40 publications

Grain-Level Numerical Simulations for the Effective Elasticity of Weakly Cemented Sandstones

Grain-Level Numerical Simulations for the Effective Elasticity of Weakly Cemented Sandstones

Petro-physical Characterization of the Shallow Sediments in a Coastal Area in NE Italy from the Integration of Active Seismic and Resistivity Data

Surface flaking mechanism of stone components of ancient building complex in Wudang Mountain, China

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