Hamdan Ali Hamdan

• PhD
• Professor (Assistant) at University of Sharjah

The study area for oil fields in Egypt's Burg El Arab area relies on three-dimensional (3D) reservoir modeling thatintegrates seismic and well data using geostatistical methods. This study focuses on the Upper Cretaceous BahariyaFormation, which holds significant hydrocarbon potential. To gain a comprehensive understanding of these reservoirs,3D st...

The possible seismo-ionospheric anomalies of the recent Mw 6.0 and Mw 6.4 twin earthquakes of 14 November 2021 in southern Iran were studied through Global Positioning System (GPS) and ground ionosonde observations. GPS measured total electron content observations, and ionosonde measured NmF2 and hmF2, showing ionospheric anomalies in the pre-seism...

We are investigating the effect of the thermal properties of backfill material on the efficiency of underground thermal energy systems. We have used aluminum to increase the thermal properties of clay-bentonite and to investigate its potential as a backfill material in underground heat exchange applications. The measurements of thermal properties w...

Ionospheric anomalies associated with the Mw 6.0 and Mw 6.4 south Iran twin earthquakes were investigated through GPS and ground Ionosonde observations. The pre-seismic and the co-seismic ionospheric disturbances (CIDs) were observed in the GPS measured Total Electron Content (TEC) and the Ionosonde measured NmF2 and hmF2. The results show positive...

Estimating soil infiltration rate is of utmost importance in agricultural applications. The infiltration rate determines the amount of water to enter the soil, which in turn controls the load of dissolved chemicals (nutrients or pollutants) that will interact with the soil. The soil infiltration rate is commonly measured using the cylinder infiltro...

The integration of multiscale datasets, including seismic, well-logs and stratigraphy, is providing a precise picture about reservoir evaluation and spatial distribution. This study focuses on the seismic interpretation and sequence stratigraphic analysis of the Bahariya Formation in the South Umbaraka oilfields (Selkit, Khepri, and Sethos), locate...

In open pit mining areas, knowledge of geotechnical conditions (e.g., overburden thickness, background slope, and fault locations) ensures geotechnical safety during exploitation as well as reclamation planning. The Greek Public Power Corporation initiated a research program after stability issues emerged on the southern side of the Mavropigi open...

The incised-valley sandstones has been identified as a significant contributor to global hydrocarbon resources. This study aims to assess the reservoir properties of the Messinian Abu Madi (AM) sandstones in the incised valleys of the Baltim, Nidoco, and Abu Madi gas fields in the Nile Delta Basin, Egypt. The hydrocarbon potential of these sandston...

The evaluation of the Turonian "AR/G" reservoirs in the Heba field, located in the eastern part of the Abu Gharadig Basin in the Western Desert of Egypt, is a crucial aspect of hydrocarbon exploration and development in the region. To achieve this, a comprehensive analysis of wells and seismic data was conducted. The seismic interpretation revealed...

This is a short field guide we use for our students in Jebel Faya. We will updated soon in the forthcoming semesters Access in the Jebel Faya is not free but they are other localities where you can see the outcrops

Global optimization methods have recently become an essential option in the processing and interpretation of geophysical data sets. In this study, we compared the optimization capability of five global optimization techniques in terms of their ability to localize a global solution and computation cost using objective functions for direct current re...

The main geological structures in the Dammam Dome are defined by integrating geophys-ical measurements and applying new methodological approaches. Dammam Dome is characterized by a well-developed fracture/joints system; thus, high complexity of the subsurface is expected. Direct Current Resistivity (DCR) and Seismic Refraction (SR) geophysical surv...

Most geophysical inversions face the problem of non-uniqueness, which poses a challenge in the mapping and delineation of the subsurface anomalies. To tackle this challenge, a combined local and global optimization approach is considered for jointly inverting two-dimensional direct current resistivity (DCR) and seismic refraction (SR) data that aim...

Shales and carbonate-rich sediments are crucial in characterizing the geological history of petroleum as source rocks. This emphasizes the global significance of carbonate source rocks, and it has sparked research interests and exploration of these strata as unconventional resources. This study presents inclusive organic geochemical characteristics...

Turning arid regions or forests into urban areas (Urbanization) is affecting the global temperature. This effect is intensifying due to uncontrolled urban growth. To understand the influence of land use land cover (LULC) on land surface temperature (LST) in dry arid climate cities like Sharjah, UAE, 2 Landsat 8 images were used to retrieve the LST,...

As part of the International Geoscience IGCP-715 project, we present the core objective and preliminary analyses on the karst development of the study areas. Our aim is to further characterize the geomorphologic features of the extended karst of Koiliaris Critical Zone Observatory (KCZO), Crete, Greece. Simultaneously to better understand the main...

Several researchers have utilized multipath summation to manage the common problem of scattered energy within GPR sections. Such energy results in degrading the lateral resolution and continuity of reflectors. If detailed velocity models are known, then it is fairly easy to focus the scattered energy by means of conventional migration methods. Howe...

The Ras El Ush field (Gulf of Suez, Egypt) is characterized by various complex structural features, such as evaporite deposits and faulting. Such complex geologic setting results in difficulties in terms of high-resolution seismic interpretation. The seismic energy was masked by the Pre-Miocene salt formation and attenuated by evaporite deposits in...

Geophysical inversion is usually carried out to quantitatively analyze the earth model and estimate its physical properties. Successful delineation of these properties such as layer boundaries, or other near-surface structures are crucial to understand the near-surface inhomogeneity. In this study, we focus on the use of joint inversion of seismic...

Ground Penetrating Radar (GPR) sections commonly suffer from strong scattered energy and weak reflectors, with distorted lateral continuity. This is mainly due to the gradual variation of moisture with depth, dense lateral sampling of common-offset GPR traces (which are considered as zero-offset data), along with the small wave-length of the electr...

GPR (Ground Penetrating Radar) data migration requires a detailed velocity model, which can be acquired only by implementing multi-offset measurements. Today, the mostly used antenna array is the common-offset due to its limited time needed for measurements and the relatively simple processing steps in order to reach the final GPR section. This, le...

A geophysical survey was conducted at Bafra, Samsun, Turkey, Greece in order to support the geological and hydrogeological studies of the existing phenomenon of seawater intrusion. This survey employed seismic refraction tomography (ST), time domain electromagnetic (TDEM) and geoelectrical methods. The later, consisted of Electrical Resistivity Tom...

A geophysical survey carried out at Scourta plateau in Central Greece employed the electrical tomography method in order to image the interface between Alpine and Post-Alpine formations and estimate the thickness of Terra Rossa deposits. The later are crucial for TITAN-SA cement company open pit mine. This mine provides row materials for cement pro...

A geophysical survey was conducted at Bafra, Samsun, Turkey, Greece in order to support the geological and hydrogeological studies of the existing phenomenon of seawater intrusion. This survey employed seismic refraction tomography (ST), time domain electromagnetic (TDEM) and geoelectrical methods. The later, consisted of Electrical Resistivity Tom...

In this work, we present the results of a geophysical survey at Malia, Crete, Greece. This survey combines VES, electrical tomography and seismic refraction at two sites where equal number of water reservoirs is planned to be constructed for the needs of a hybrid power station using wind-hydro pumping renewable energy. The geophysical sections are...

A geophysical survey was conducted at Tybaki, Crete, Greece in order to support the geological and hydrogeological studies of the existing phenomenon of seawater intrusion. This survey employed seismic refraction, transient electromagnetic (TEM) and geoelectrical methods. The later, consisted of Vertical Electrical Sounding (VES) and Electrical Res...

4 present the processing and interpretation of data to show seawater intrusion imaging. C oastal areas are densely populated, since they pro-vide the best conditions for both economic develop-ment and quality of life. One of the most important environmental problems in coastal areas is the salinization of ground water. The dynamic hydrogeological b...

In this paper, the application of 2D and 3D electrical resistivity methods in geotechnical investigations is explored through a case study in Northern Greece. These two methods were employed at a lignite surface mining operation where fracture zones and discontinuities have been recently observed close to the pit boundaries. The main aim of the geo...

This case study presents the results of a geophysical survey, where 2D and 3D Electrical Resistivity Tomography were employed to evaluate the stability of surface lignite mine's slopes. Specifically, it took place in the Mavropigi lignite open pit mine, Northern Greece, where fracture zones and discontinuities have been recently observed close to t...

This work involves the use of resistivity and borehole data for the delineation of weak zones in karstic carbonates at Malia, Crete, Greece, where two water reservoirs will be constructed. Site M mostly consists of cretaceous carbonates belonging to the Tripolis zone while Site K consists of upper triassic carbonates of the Tripolis zone. Electrica...

One of the most important environmental problems in coastal areas is the salinization of ground water. The groundwater contamination due to seawater intrusion is usually caused by a violation of a delicate hydrogeological balance that exists between freshwater and seawater in coastal aquifers. The development of a methodology for the prediction of...

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A geophysical survey carried out at Omalos plateau in Chania, Western Crete, Greece employed seismic as well as electrical tomography methods in order to image karstic structures and the metamorphic carbonates (Tripali unit and Plattenkalk group) which are covered by post-Mesozoic deposits (terra rossa, clays, sands and gravels). The geoelectrical...

This paper focuses on the use of geological and geophysical tools in order to contribute in creating a cultural route from the town of Neapoli to the coastal areas, through the cisterns of Epano Mirabello, Eastern Crete. The first stage of this study involves the restoration and use of the threatened traditional wells and cisterns. In order to achi...

The simultaneous inversion of multiple geo-physical data types has been proven to be a powerful tool to both improve subsurface imaging and help in the inter-pretation process. The main goal of this paper was to develop joint inversion strategies to provide improved resistivity and seismic velocity images for delineating saline water zones in karst...

This case study presents the results of a geophysical survey that was carried out in 2008-9 at Omalos plateau in Chania, Western Crete, Greece. During this survey we applied seismic methods as well as electrical tomography in order to image the active karstic structures of the Omalos polje. The resistivity and seismic velocity sections image proper...

Numerous biogenic methane gas seepages in Arkalochori region of Central Crete were the motivation to explore the gas potential of the area. According to recent studies, the gases seem to be of biogenic rather than thermogenic origin. To quantify the size of the potential reservoir, the construction of a 3D model concerning the shallow Neogene sedim...

A well known problem in the grinding procedure, in active gypsum open pits, is the difference of mechanical properties between gypsum and anhydrite. Specifically, the lower stiffness of gypsum compared to that of anhydrite, causes different energy requirements in cement production line. For these reasons it is necessary to be aware of the spatial d...

The needs for water supply in the western coastal zone of Kavala (N. Greece) have been rap�idly increased during the last decades because of the high tourist and agricultural develop�ment. This resulted to a number of wells that drilled along the coastline. During summer period, when human and irrigation consumptions are maximized, phenomena of gro...

Geophysical methods are useful for mapping the boundary between fresh and saline water in coastal areas. However, the existence of karstic formations increases the uncertainty on geophysical sections and complicates the interpretation of geophysical data. In this paper, a systematic geophysical methodology for imaging saline water intrusion, in com...

The complexity of karstic structures causes major problems in the processing and interpretation of 2D resistivity data. This paper investigates the optimum inversion method to be applied in such cases. Three inversion methods (combined, smoothness constrained and robust inversion) are applied on real data set and their results are compared. In addi...

Classification techniques such as the self-organizing-maps (SOM) network are proposed as a tool for efficient interpretation of geophysical data obtained from archaeological investigation. This methodology was useful for the interpretation of georadar data from the archaeological site of Aptera, Chania, Greece where an integrated geophysical survey...

Geophysical methods are useful tools for mapping the boundary between fresh and saline water. A geophysical survey was conducted in order to study the mechanisms of saltwater contamination in a strongly karstic coastal area. The region of interest is located in Western Crete about 3 m from the seashore. Seismic and electrical resistivity methods, a...

A geological and geophysical study was conducted at the area of Stylos, Hania in order to study the possible mechanisms of saltwater contamination. A new detailed geologic map in scale 1:5,000 was combined with the results of a time lapse geophysical survey using seismic and electrical methods. A fault system in the N-NE direction possibly favors t...

Σκοπός της έρευνας αυτής αποτέλεσε η οριοθέτηση και χαρτογραφική απεικόνιση διαβαθμισμένων εδαφών ως προς την καταλληλότητα τους για ασφαλή δόμηση στην περιοχή Βασιλειών, στο πλαίσιο της εκπόνησης Μελέτης Γενικού Πολεοδομικού Σχεδιασμού του Πολεοδομικού συγκροτήματος Ηρακλείου. Γεωμετρικού τύπου δεδομένα, (κλίσεις και παρατάξεις στρωμάτων και επιφα...

The geophysical methods of electrical sounding and seismic reflection are widely used in areas with hydrogeological interest because they are inexpensive and quick. Also, they give reliable information regarding the geological background of the surveyed area. This work aims to stress the necessity of geophysical surveying, combined with sophisticat...

At the Zoforoi limestone quarry, an integrated survey was carried out using electrical tomography and ground penetrating radar. One of the purposes of the survey was the comparison of the results of different geophysical methods. Additionally, the purpose of the integrated survey was to explore the possibility of limestone characterization, regardi...

This paper discusses the preliminary results of a geophysical survey that was carried out at the Omalos plateau in Chania, Crete. The geophysical survey included measurements of electrical tomography, electrical mapping, seismic refraction, georadar, VLF and gravity. The aim of this survey is to compare the results from different geophysical method...

This paper discusses the preliminary results of a geophysical survey that was carried out at the Omalos plateau in Chania, Crete. The geophysical survey included measurements of electrical tomography, electrical mapping, seismic refraction, georadar, VLF and gravity. The aim of this survey is to compare the results from different geophysical method...

This paper presents the results from a geophysical survey conducted at Kountoura vergion, Chania. The aim of this survey was to estimate the thickness of the geological formations in the area where a dam is going to be constructed. Electrical tomography and seismic refraction were utilized in order to indicate the location of four drill holes. VLF,...

This paper presents the results from a geophysical survey conducted at Kountoura vergion, Chania. The aim of this survey was to estimate the thickness of the geological formations in the area where a dam is going to be constructed. Electrical tomography and seismic refraction were utilized in order to indicate the location of four drill holes. VLF,...

This paper discusses the preliminary results of a geophysical survey that was carried out at the Omalos plateau in Chania, Crete. The geophysical survey included measurements of electrical tomography, electrical mapping, seismic refraction, georadar, VLF and gravity. The aim of this survey is to compare the results from different geophysical method...