Core size effect on the dry and saturated ultrasonic pulse velocity of limestone samples

Erçıkdı, Bayram; Karaman, Kadir; Cihangir, Ferdi; Yılmaz, Tekin; Aliyazıcıoğlu, Şener; Kesimal, Ayhan

doi:10.1016/j.ultras.2016.08.006

Cited by 29 publications

(10 citation statements)

References 27 publications

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“…Most likely, this decrease is caused by the presence of stylolites and fractures (see, for instance, Figure 12d) in which residual minerals, mainly clay minerals, were accumulated (Figure 12e). The clay minerals, in the presence of water, can cause swelling phenomena inside the fractures, thus increasing their aperture and the rock volume, with a consequent worsening of the acoustic properties of the rocks, which was also recognized in earlier studies [110,111].…”

Section: Acoustic Velocity Density and Porositymentioning

confidence: 53%

A Contribution to the Geological Characterization of a Potential Caprock-Reservoir System in the Sulcis Coal Basin (South-Western Sardinia)

et al. 2019

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The results provided by this study contribute to the geological characterization of a potential caprock-reservoir system for CO2 storage in the experimental area of the mining district of the Sulcis Coal Basin (south-western Sardinia, Italy). The work is aimed to improve the knowledge of the petrographic and petrophysical characteristics of the siliciclastic and carbonate geological formations that make up the potential caprock-reservoir system. Core samples from a number of wells drilled in the study area for mining purposes were analyzed especially for texture and physical properties (longitudinal velocity, density, porosity, and permeability). The preliminary integrated petrographic and petrophysical characterizations indicate that the Upper Paleocene to Early Eocene potential carbonate reservoir is heterogeneous but presents suitable reservoir zones for CO2. A preliminary analysis of the potential caprock siliciclastic lithologies of the Middle Eocene to Lower Oligocene suggests that they appear suitable for CO2 confinement. Finally, to account for the stability of the investigated area, an accurate geodynamical study of south-western Sardinia was carried out using global navigation satellite system and advanced differential interferometric synthetic aperture radar methodologies in order to estimate vertical and horizontal crustal displacements. The study area results stable, since it is characterized by surface crustal horizontal and vertical velocities smaller than 1 mm/year and few mm/year, respectively.

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Section: Acoustic Velocity Density and Porositymentioning

confidence: 53%

A Contribution to the Geological Characterization of a Potential Caprock-Reservoir System in the Sulcis Coal Basin (South-Western Sardinia)

et al. 2019

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“…The ultrasonic pulse velocity (UPV) as an index of rock strength is well explained by (Aldeeky and Al Hattamleh 2018;Ercikdi et al 2016;Gomez-Heras et al 2020;Selçuk and Nar 2016). They argued that UPV with detailed petrography can evaluate fractures and compactness in rocks.…”

Section: Discussionmentioning

confidence: 99%

The control of composition, texture and weathering on the physical and strength properties of selected intrusive igneous rocks from North Pakistan

Yasir

Ahmed

Sajid

2021

Preprint

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This work characterizes intrusive igneous rocks from north Pakistan in terms of their mineralogy, texture and weathering grades and their effect on the physical and strength properties. The mafic and intermediate rocks showed a low cumulative percentage of quartz, feldspar and plagioclase with high specific gravity, strength (i.e. UCS and R-value) and UPV values compared to the felsic rocks. Likewise, samples with anhedral grain shape, irregular boundaries, fine to medium grain size (UD, ANS, CGN) showed higher strength values, that is, 121, 118 and 91 MPa compressive strength and 11, 9, and 12 MPa tensile strengths, respectively. The weathering grades assigned to the investigated samples, such as fresh (WG-I), slightly weathered (WG-II) and highly weathered (WG-III) corresponded well with the physical and strength properties, that is, as the grade increased from WG-I to WG-III, the porosity and water absorption increased (0.28% and 0.72% respectively), whereas the specific gravity, compressive strength and tensile strength decreased (2.04, 20 MPa and 2.5 MPa, respectively, for CGA). The presence of quartz affects rock strength; however, no significant correlation was observed for strength and maximum and mean grain sizes of different minerals.

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“…Ultrasonic P-wave velocity (UPV) technique is an effective nondestructive testing method to evaluate the inner damage state of rock [42][43][44]. Previous studies suggested that the variation of wave velocity depends on the damage extent of rocks [45,46].…”

Section: P-wave Velocitymentioning

confidence: 99%

Damage Evolution and Failure Behavior of Post-Mainshock Damaged Rocks under Aftershock Effects

et al. 2019

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Rock stability has long been a hot topic during underground energy exploitation, but the failure process of rock materials under earthquake effects is extremely complicated, and the failure mechanism still remains unclear. In order to investigate the fatigue damage and failure behavior of rocks under aftershock effects considering the post-mainshock damage states, a series of laboratory tests were conducted on marble specimens subjected to stepwise cyclic loading. Four levels of peak stress (i.e., 10, 30, 50, and 70 MPa) were applied in the first cycle, to simulate mainshock damage.The results indicate that, with the increase of initial cycle amplitude, mainshock damage has a significant effect on deformation behavior, dissipated energy, P-wave velocity, and AE characteristics of tested specimens during aftershock process. The increasing amplitude of initial cycle enhances irreversible deformation and weakens the resistance to deformation, which accelerates the expansion of specimen volume and results in the reduction of bearing capacity. Furthermore, the increasing amplitude of initial cycle obviously changes the failure morphologies and intensifies the final macro-fracture scale of tested specimens, which are verified by acoustic emission AF-RA value and b-value, respectively.

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Core size effect on the dry and saturated ultrasonic pulse velocity of limestone samples

Cited by 29 publications

References 27 publications

A Contribution to the Geological Characterization of a Potential Caprock-Reservoir System in the Sulcis Coal Basin (South-Western Sardinia)

A Contribution to the Geological Characterization of a Potential Caprock-Reservoir System in the Sulcis Coal Basin (South-Western Sardinia)

The control of composition, texture and weathering on the physical and strength properties of selected intrusive igneous rocks from North Pakistan

Damage Evolution and Failure Behavior of Post-Mainshock Damaged Rocks under Aftershock Effects

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