Ido Tkacz
PhD Student
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Ido Tkacz
With a BSc on Electrical Engineer and a wide background on electromagnetic RF propagation and electrical properties of the subsurface, Ido has initiated and developed this project tangling cooperation with industry. Apart of science, Ido is a SSI scuba diver instructor and also volunteer in salvation and rescue corps in Northern Israel, which keeps him busy during summer time. Until recently, Ido was the commander of the Israeli northern search and rescue diving unit, which belongs to the Israeli police. Ido has a BSc in electrical engineer and graduated with a MSc in Marine Geology from the University of Haifa in 2019 and he is currently involved in a PhD in cooperation with industry.
Current research
Current research
Insights into the petrophysical and electric properties of the shallow subsurface in the western Negev and their relations to changes in the magnetic field
In the current study we show a new record of petrophysical properties of the shallow underground in the south Shfela region, southern Israel. A 34 meter long core was retrieved and subsequently a Multi Sensor Core Logger (MSCL) was used to measure sonic velocity, density and magnetic susceptibility. The down-core logging was complemented with down-hole measurements of the electrical properties using vertical borehole magnetic field measurement providing a comprehensive dataset of the uppermost ~35 m of sediments. Our results were further amalgamated with laboratory measurements of permittivity and conductivity using MC-100 dielectric test cell.
Our study shows that magnetic field attenuation and MSCL datasets have major variations in the shallow sedimentary overburden indicating a non-homogeneous record that can be divided into three major stratigraphical layers: U1, U2 and U3 (0-12, 12-22, and 22-34 m, respectively). The magnetic susceptibility, P-wave velocity and gamma-density values show a good agreement with the magnetic field attenuation changes. One of the most obvious observations is that while the magnetic susceptibility and the P-wave velocity values decrease with depth, the density increases. Initial interpretation of the dataset provides important clues that can be used to better understand the influence of climate and hydrological changes on the petrophysical properties of the sedimentary record.
A complementary work will be further carried out utilizing standard sedimentological analyses (e.g., granulometry, microscopy and mineralogy) and chronology (e.g., OSL) in order to identify the different sedimentary components influencing the identified changes in the petrophysical values through time.
SEM images of sediment samples obtained from depth of ~30 m in the core. Quartz is the dominant mineral at this depth, with secondary feldspar minerals.
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