Dr. Ido Tkacz

Graduated PhD Student

Ido Tkacz

With a BSc in Electrical Engineering and a wide background in electromagnetic RF propagation and electrical properties of the subsurface, Ido has initiated and developed this project in cooperation with industry. Apart of science, Ido is an SSI scuba diver instructor and also volunteers in the Salvation and Rescue Corps in Northern Israel, which keeps him busy during the summer. 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 engineering and graduated with an MSc in Marine Geology from the University of Haifa in 2019, and he is currently involved in a PhD in cooperation with industry.

itkacz@gmail.com

PhD 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 measurements, providing a comprehensive dataset of the uppermost ~35 m of sediments. Our results were further amalgamated with laboratory measurements of permittivity and conductivity using an 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 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.

Report abuse