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Carbonate Rocks - Crossref

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Last Updated: 15 December 2022

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A comprehensive view on the compilation of an engineering geological map of carbonate rocks: a case study in the Central Alborz Zone, Iran

The geological provinces of Iran can be divided into different zones based on various geological and structural units. Central Alborz Zone is one of the most important zones of them, extending along the southern coast of the Caspian Sea from Sepidrud valley to Firoozkuh valley. Integrating geological, engineering geological, geomorphological, and joint research results of carbonate rocks, as previously reported by other researchers in a certain range of characteristics, we obtained similar results in drawing an engineering geological map by integrating geological, engineering geological, geomorphological, and joint study data of carbonate rocks. Both formations fell within the moderate strength to high strength range based on the International Standard for Rock Mechanics classifications, as well as a wide point load index based on the Broch and Franklin classifications, according to uniaxial compressive strength results.

Source link: https://doi.org/10.1144/qjegh2021-062


A linear approach to simulate a constant-Q model in time-domain ground-penetrating radar modeling using multiple Debye poles: Theory and application in karst carbonate rocks

The number of poles and their parameters must be estimated to meet target values for [Formula: see text] and velocity in the requested frequency band, as in time-domain wave simulation, to simulate a constant [Formula: see text] medium, using multiple Debye poles. Solutions with specific target values for velocity and [Formula: see text] are obtained from the rescaled solution by multiplying this number by a proportionality factor that only depends on the target values. For the 200 MHz antenna, whose useful frequency band is 50–u2013800 MHz, we find that using the criterion [Formula: see text] and [Formula: see text] curves must display maximum percentage deviations from the original target values of less than 5%.

Source link: https://doi.org/10.1190/geo2021-0731.1


Several machine learning techniques comparison for the prediction of the uniaxial compressive strength of carbonate rocks

For the rock block sampling, coring, and testing, Measuring the UCS of rocks requires extensive research both in the field and in the laboratory. This study is designed to determine the UCS of the carbonate rock by using a simple, measured Schmidt Hammer test on a core sample and a unit weight of carbonate rock. The Sequential neural network has a slight advantage over the other three models based on root mean square error, mean absolute error, and R 2.

Source link: https://doi.org/10.1038/s41598-022-25633-0


Feedback between high-pressure genesis of abiotic methane and strain localization in subducted carbonate rocks

Abstract Fluid-rock interactions play a vital role in rock rheology and strain localization. However, the links between deep carbon mobilization and deformation remain poorly investigated. We present quantitative microstructural data from natural samples and thermodynamic modeling, indicating that percolation of reduced fluids maintains a large influence on the mobilization of carbon and strain localization in subducted carbonate rocks. These findings indicate that carbonate rock reduction can have a major positive effect on strain localization and fluid channelization, as well as seismic activity and the transport of deep hydrocarbon-bearing fluids.

Source link: https://doi.org/10.1038/s41598-020-66640-3


Geological studies and engineering applications of some Middle Eocene carbonate rocks in East The Minia Area, Egypt

Abstract Carbonate rocks from Minia, Samalut, Maghagha, and Qarara localities were gathered for geological and engineering research. The rock has the most desirable characteristics for various applications in civil engineering fields and chemical plants, according to the petrography, physical, and mechanical tests. Samalut Formation carbonates are remarkably pure. In addition, the Maghagha and Qarara Formations are suitable for building.

Source link: https://doi.org/10.1007/s12517-022-10915-8


Shortwave infrared hyperspectral imaging as a novel method to elucidate multi-phase dolomitization, recrystallization, and cementation in carbonate sedimentary rocks

We investigate the effectiveness and limitations of hyperspectral imaging to help clarify multi-phase dolomitization and cementation in the Cathedral Formation. Spectral endmembers include limestone, two new dolomite phases, and three saddle dolomite phases. Endmember distributions were mapped using Spectral Angle Mapper, then sampled and analyzed to investigate the controls's spectral signatures. Changes in %Ca and trace element substitution are apparent in each phase, according to the absorption-band position, although the spectral comparison correlates with texture.

Source link: https://doi.org/10.1038/s41598-021-01118-4


Manipulation of surface charges of oil droplets and carbonate rocks to improve oil recovery

This work looks at the effect of the surface charges of oil droplets and carbonate rocks in brine and on oil production. Both oil droplets and carbonate rock particles are investigated, as well as the effects of the cations in brine and surfactant varieties on the zeta-potentials of both oil droplets and carbonate rock particles. The addition of anionic and cationic surfactants in brine result in negative or positive zeta-potentials of rock particles and oil droplets, respectively, while the zwitterionic surfactant causes a positive charge on rock particles and a negative charge on oil droplets, respectively. This shows that a mixture of rocks and oil droplets improves the transport of charged oil/water emulsion in porous media.

Source link: https://doi.org/10.1038/s41598-021-93920-3

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions