High-resistivity Layer Research Articles

Application of Time Domain Electromagnetic survey to detect fractured limestone aquifer in desert fringes, West Assiut, Egypt

ABSTRACT New agriculture projects in the desert fringes along the western side of the Nile Valley of Egypt need exploring new groundwater resources. Time Domain Electromagnetic (TDEM) technique was used to acquire the field data. This technique is focusing on two main objectives. The first objective is to test the availability of applying TDEM in areas where other DC resistivity methods can’t be applied due to the presence of a high resistive layer on the ground surface such as in the investigated area. The second objective is detecting the geoelectrical succession, emphasising on the water-bearing layer, which is represented by the fractured Eocene limestone layers. Results obtained from TDEM soundings were represented in the forms of cross sections and maps to illustrate the aerial distribution of the different geoelectrical layers and pay attention on the water-bearing layer. These results show up a good agreement with the data obtained from the drilled wells in the study areas. Accordingly, TDEM method is a suitable choice when other DC resistivity tools were failed to acquire field data. Moreover, this technique helped to determine the parameters of the water-bearing layer such as resistivity, thickness, and extension. Also, it gives an idea about the hydrogeological setting of the study area where the water-bearing the fractured limestone layer overlays the low resistivity shale beds. New sites were recommended to drill productive wells in the western and southern parts of the study area based on the resistivity values and the thicknesses of the water-bearing layer.

Genesis of bitumen and high resistivity water layer in Yanchang formation, Ordos Basin, China

ABSTRACT Many oil-bearing basins in the world have found high-resistivity water layers, which brings difficulties to the identification of oil-water layers and the exploration and development of oil fields. Yanchang Formation in Ordos Basin shows complex oil-water enrichment characteristics. Oil wells and water wells are interspersed on the plane. The resistivity of water layer is higher than that of oil layer, and it is difficult to explain it with the existing theory. Taking Chang 81 reservoir in Yuele area as an example, the electrical, physical and oil-bearing characteristics of two oil wells (B23 and Y73) and two water wells (Y79 and Y55) in Yuele area were comparatively studied by means of extraction experiment, GC-MS analysis, thin section observation, rock pyrolysis, resistivity, and physical property test. The results show that the high resistivity of water layer in Yanchang Formation of Ordos Basin is caused by biodegradation asphalt and heavy component of residual oil after structural adjustment. Asphalt filling is the main reason for high resistivity of water layer. The residual heavy hydrocarbon after structural adjustment aggravates the high resistivity of water layer.

High performance InGaAs channel MOSFETs on highly resistive InAlAs buffer layers

We investigated the effect of growth temperature on the structural and electrical properties of InAlAs layers grown on InP (100) substrates by metalorganic chemical vapor deposition (MOCVD) method. Flat surface morphology of InAlAs layers with root mean square (RMS) surface roughness values below 0.4 nm were obtained at 500 °C and 660 °C, while RMS surface roughness values of InAlAs layers grown in the region of intermediate temperature increase from 0.7 nm at 540 °C to 3.9 nm at 620 °C with increasing growth temperature. This increase in surface roughness is caused by the phase separation of the InAlAs layer, which is divided into In-rich and Al-rich column regions. The resistivity values of the InAlAs layers grown at 500 °C and 660 °C, in which the phase separation was not observed, were analyzed by the transmission line method (TLM) and those values were ~1 × 104 Ω·cm and 0.06 Ω·cm, respectively. We propose that oxygen atoms being incorporated into InAlAs layers during growth were the cause effect explaining the change in resistivity depending on the growth temperature. In order to evaluate high-resistivity InAlAs layers grown at 500 °C for a buffer layer of devices, we fabricated InGaAs-channel metal oxide field effect transistors (MOSFETs). The on/off current ratio values obtained from ID-VG transfer measurement was a value of 6.10 × 105, indicating a high-performance characteristic.

Sn doped ZnO thin films as high resistivity window layer for Cu(In,Ga)Se2 solar cells

For high efficiency Cu(In,Ga)Se2 (CIGS) solar cell, the high-resistivity layer with high optical transmittance has to be adopted between the buffer layer and the high-conductivity window layer. In this paper, we propose Sn doped ZnO (ZTO) film, instead of the traditional intrinsic ZnO (i-ZnO) film, as an alternative n-type high-resistivity window layer for CIGS solar cell. In this experiment, both ZTO and i-ZnO films are strong (002) oriented, and the surface morphologies of the two films are almost the same. The statistical roughnesses of i-ZnO film and ZTO film are 0.58 nm and 0.63 nm, respectively. However, the optical transmittance of ZTO film is higher than that of i-ZnO film with the same thickness. The efficiency of ZTO based CIGS cell was 14.24%, which is almost the same as the efficiency of i-ZnO based CIGS cell. These results fully suggest that it is very feasible to replace i-ZnO with ZTO as the high resistant window layer.

Ore-controlling structures of the Xiangshan volcanic Basin, SE China: Revealed from three-dimensional inversion of Magnetotelluric data

We report a high-resolution three-dimensional (3D) Magnetotelluric (MT) study to define the mineralizing system of the Xiangshan (XS) volcanic Basin, which hosts the largest volcanic-related uranium deposits in China. MT data from 81 stations were collected and inverted, using a 3D Truncated Newton (TRN) inversion algorithm. The generated electrical resistivity model reveals a high resistivity layer in the shallow, followed by a conductivity layer, and they were formed respectively by the Cretaceous Ehuling Formation and Daguding Formation. Under these Cretaceous formations, a series of high resistivity features delineate the Precambrian metamorphic basement. The contact zone between the high resistivity and conductivity layer corresponds to the inter-formational surface in the Cretaceous volcanic cover, whereas the contact zone between the volcanic cover and metamorphic basement represents the unconformity surface which was supported by gravity data. The identified faults in the 3D resistivity model coincide with the NE- and NS-trending faults observed on the surface. These faults are the crucial ore-controlling structures with high permeability allowing the ore-forming fluids to migrate upwards. We reveal a possible genetic model for the uranium mineralization in the XS volcanic Basin. The mixture of the descending meteoric water and ascending magmatic fluids along the deep faults formed the ore-forming fluids. The precipitation and enrichment of uranium were prone to occur in the ring faults, interfaces, unconformity surfaces and those geologic contacts intersecting with faults, where the physical and chemical properties of the ore-forming fluids were changed. Given that the mafic magmatism generally was coeval with the uranium mineralization, the deep-seated magmatism is supposed to be the force that drove the fluids upwards and governed the circulative convection of ore-forming fluids in the XS volcanic Basin.

DELINEATION OF GEOMETRY AND SPATIAL DISTRIBUTION OF BASIC BODIES USING MAGNETIC AND RESISTIVITY METHODS IN SOHAGPUR COAL FIELD AREA, MADHYA PRADESH

The state of Madhya Pradesh in Central India is known to bear ‘A’ grade coal seams within Gondwana basin. An alluvium-covered area to the north-east of Shahdol was considered to be prospective for the exploration of coal. A number of basic intrusive are encountered in the area and these appear to have played an important role for enhancement of the rank of coal seams. Delineation of the geometry and spatial distribution of these basic bodies has therefore become necessary for exploration of high rank coal seams. Magnetic and resistivity surveys were mainly carried out. Geologically, the alluvium covered area was known to be composed of rocks of different ages such as Precambrian, Gondwana Triassic, Cretaceous (trap) and older alluvium in succession. Gondwana basins are formed over basement depressions or in the downthrown side of the faulted Precambrian. Gondwana sediments lying over such basement sub-basins are prospective areas for the exploration of coal. The magnetic map was vitiated through the presence of high amplitude and small wavelength anomalies due to a thick blanket of basic bodies lying above the Gondwana sediments. Fluctuations in magnetic responses are observed at a few locations which may be due to the presence of basement faults? Low intensity but distinct anomaly patterns are observed in the south-western part of the area possibly indicating subsurface basic intrusive. 2D modeling of the magnetic data has effectively brought out the basement depth varying between 680 m to 1460 m an increasing trend from west to east. Selected resistivity soundings confirm that the overlying high resistivity layer (107-390 Ohm-m) and of thickness (0.7-386.3 m) may possibly indicate the geometry of basic bodies from the surface to depth of 547.5 m. The basement could not be picked up.

Design and Characterization of the CLICTD Pixelated Monolithic Sensor Chip

A novel monolithic pixelated sensor and readout chip, the compact linear collider tracker detector (CLICTD) chip, is presented. The CLICTD chip was designed targeting the requirements of the silicon tracker development for the experiment at the compact linear collider (CLIC) and has been fabricated in a modified 180 nm CMOS imaging process with charge collection on a high-resistivity p-type epitaxial layer. The chip features a matrix of $16\times 128$ elongated channels, each measuring $300\times 30\,\,\mu \text {m}^{2}$ . Each channel contains 8 equidistant collection electrodes and analog readout circuits to ensure prompt signal formation. A simultaneous 8-bit time-of-arrival (with 10 ns time bins) and 5-bit time-over-threshold measurement is performed on the combined digital output of the 8 subpixels in every channel. The chip has been fabricated in two process variants and characterized in laboratory measurements using electrical test pulses and radiation sources. Results show a minimum threshold between 135 and 180 e− and a noise of about 14 e− rms. The design aspects and characterization results of the CLICTD chip are presented.

Cauchy type inverse problem in a two-layer area in the blades of gas turbine

In order to reduce the thermal load of the gas turbine blade, its surface is covered with an external ceramic layer of high thermal resistance. The main problem considered in our research is the selection of ceramics with a low value of specific thermal conductivity and its thickness of the layer. Obtained values should be chosen, such that the permissible metal temperature is not exceeded at the metal-ceramic boundary. It would result in the loss of mechanical properties. Therefore, for a given temperature distribution at the metal-ceramic boundary, the temperature on the inside of the blade and the initial temperature should determine the temperature function on the external surface of the ceramic. This is a Cauchy type problem. The paper considers the case of one-dimensional, unsteady flow. The influence of heat conduction ratio of the ceramic layer and thickness of the layer was investigated. The results showed, that the implementation of ceramic layer causes a decrease in temperaturee what improves the cooling of metal layer. The authors observed also that the thickness if ceramic layer is crucial – its value should be selected so that not to cause a loss of mechanical properties of metal layer.

Special features of the studies of deep electrical conductivity of the Moon and the Earth (once more on toroidal mode of natural magnetic field)

Studies of the deep electrical conductivity of the Earth and the Moon are carried out by measuring and analyzing the natural electromagnetic (EM) fields excited by the solar wind, introducing an electric field of the order of 2 mV/m applied to the boundaries of the Earth’s magnetosphere or directly to the surface of the Moon. For a concentrically layered sphere with electrical conductivity σ = σ (r), the EM fields can be represented as the sum of two modes: electric with a toroidal magnetic field and magnetic with a poloidal magnetic field. Each of the modes is associated with electrical conductivity by different ratios/formulas and is characterized by different possibilities for studying the electrical conductivity inside a celestial body. It is generally accepted that currents from the boundary of the Earth’s magnetosphere descend along the geomagnetic field lines to the ionosphere, but do not reach the Earth due to the very high resistance of near-the-surface air layer (up to 1014 Ohm · m) and only poloidal fields of the magnetic mode are induced in the solid Earth. A review of the data on the global electric circuit shows that vertical currents penetrate from the atmosphere into the Earth and the electric mode is not equal to zero. Vertical currents are characterized by strong spatio-temporal variability. Separation of the modes from observation data was not carried out. On the Moon, the high-resistance layer is the lithosphere with regolith and breccias on its surface with a resistivity of 107―1012 Ohm · m. Spatial inhomogeneities of the Moon interior are considered and a conclusion is made about their multitude and intensity. Based on the analysis of the spatial distribution of tidal and tectonic moonquakes, it was suggested that they trace quasi-vertical structures like a plume. The results of observations of volcanism and transient lunar phenomena, obtained in recent years by orbital missions with high-resolution equipment, indicate an intense degassing of the moon. All this allows us to conclude that in the Moon there are quasi-vertical conductors supporting an electric mode. Proposals for the optimization of new studies of the electrical conductivity of the moon are substantiated and formulated. Deep studies of electrical conductivity are based on a theoretical model of the magnetic mode, the existence of the electrical mode is neglected, and it falls into unidentified noise, which by means of coherent analysis and multi-stage processing is largely eliminated and the conductivity models more or less correctly describe the real geoelectric structure of the Earth, but with probable systematic errors. Separation and study of the electric mode should be considered as an additional channel of information in EM studies of planets.

Influence of α- and β-W phases on performance of SMR devices

Solidly mounted resonators (SMRs) rely on high-quality Bragg reflectors, for which tungsten has been used as the high acoustic impedance layer. It is unclear about the effects of tungsten phases on the acoustic performance of SMRs. In this study, high-quality flat layers of different phase structures of W (α-W and β-W) are obtained by changing the post-growth annealing temperature and magnetron sputtering parameters. Our results show that the α-W has higher Young's modulus and acoustic impedance (205 GPa and 63 kg/m2s) than β-W (170 GPa and 57 kg/m2s). These small differences result in amplified difference in acoustic performance of Bragg reflectors using tungsten (W) as their high-impedance layer. Our tests show that the SMR of α-W Bragg reflector has a higher return loss (18.4 dB) at around 2.75 GHz and higher quality factor (687) than that of β-W Bragg reflector (9.2 dB and 228, respectively).

(Invited) All Solid-State Batteries: From Interface to New-Type Electrolytes

All-state-state lithium batteries (ASSLBs) have gained worldwide attention because of the high ionic conductivity of SEs, intrinsic safety and improved energy density. In ASSLBs, solid-state electrolyte is a key component. Compared with polymer-based and oxide-based electrolytes, sulfide-based electrolyte generally exhibits the highest ionic conductivity (10-3 ~ 10-2 S/cm) and favorable mechanical property. However, the serious interfacial challenge, bad air stability, narrow electrochemical windows of sulfide-based electrolyte significantly impede development of sulfide-based ASSLBs. Generally, an artificial, uniform and ultrathin interfacial layer is critical to address these challenges. Atomic layer deposition (ALD) and molecular layer deposition (MLD) are unique coating techniques that can realize excellent coverage and conformal deposition with precisely controllable at the nanoscale level due to its self-limiting nature, which are ideal for addressing the challenges of interface in SSLBs.In this talk, I will demonstrate to apply ALD/MLD to (i) stabilize the interface between cathode electrodes and electrolytes and prevent the formation of intrinsically high resistance layers, (ii) suppress elemental inter-diffusion during the operation of SSLBs, (iii) fabricate facile ionic transportation channels to facilitate ion exchange between different components of SSLBs, and (iv) buffer volume changes during cycling of SSLBs [1] .In this talk, I will talk about halide-based electrolyte for ASSLBs. Compared with sulfide-based electrolyte, both experimental and theoretical results recently demonstrate that halide-based electrolytes have more advantages including high RT ionic conductivity (>10-3 S cm-1, theoretically possible 10-2 S cm-1), wide electrochemically stable window (possible up to 6 V), high air-stability, good stability toward oxide cathode materials, and even salable water synthesis strategy [2-3].

Combining TCAD and Monte Carlo methods to simulate CMOS pixel sensors with a small collection electrode using the Allpix[formula omitted] framework

Combining electrostatic field simulations with Monte Carlo methods enables realistic modeling of the detector response for novel monolithic silicon detectors with strongly non-linear electric fields. Both the precise field description and the inclusion of Landau fluctuations and production of secondary particles in the sensor are crucial ingredients for the understanding and reproduction of detector characteristics.In this paper, a CMOS pixel sensor with small collection electrode design, implemented in a high-resistivity epitaxial layer, is simulated by integrating a detailed electric field model from finite element TCAD into a Monte Carlo based simulation with the Allpix2 framework. The simulation results are compared to data recorded in test-beam measurements and very good agreement is found for various quantities such as cluster size, spatial resolution and efficiency. Furthermore, the observables are studied as a function of the intra-pixel incidence position to enable a detailed comparison with the detector behavior observed in data.The validation of such simulations is fundamental for modeling the detector response and for predicting the performance of future prototype designs. Moreover, visualization plots extracted from the charge carrier drift model of the framework can aid in understanding the charge propagation behavior in different regions of the sensor.

FeSiCr@NiZn SMCs with ultra-low core losses, high resistivity for high frequency applications

Soft magnetic composites (SMCs) are widely applied in electronic devices and components, such as inductors, as they possess the highly-saturated magnetization M s of metallic materials and the highly-insulating characteristics of non-metals. However, with the development of electronic systems that require high-frequency operation, high-energy-transfer efficiency, and miniaturization, the suppression of core losses P cv in their SMCs remains a considerable challenge. Herein, we explore ways to improve the frequency dependence of core losses by using various concentrations of NiZn ferrite (0.0–5.0 wt%) to coat FeSiCr magnetic powders. The microstructural, magnetic, dielectric, and core loss performances of FeSiCr@NiZn SMCs are investigated in detail. Energy dispersive X-Ray spectroscopy (EDS) mapping confirmed that the FeSiCr magnetic powders were able to be well coated with NiZn ferrite. Core loss separation method was utilized to calculate hysteresis losses P h and eddy current losses P e from 25 to 800 kHz at 10 mT and 25 °C. With increasing NiZn ferrite concentration, both P cv and P h initially decreased and subsequently increased, while P e decreased monotonically. The sample with 3.0 wt% NiZn ferrite had the best overall performance: saturation magnetization M s = 157 emu/g, coercive force H c = 4.6 Oe, effective permeability μ e = 60, resistivity ρ = 1.25 × 10 4 Ω∙m, and core losses P cv = 38 mW/cm 3 (at 800 kHz, 10 mT, and 25 °C). The excellent electromagnetic properties of these novel FeSiCr@NiZn SMCs give them enormous application potential in the fields of power transmission and conversion. • EDS mapping confirmed that the FeSiCr powders were well coated with NiZn ferrite. • The high-resistance layer of NiZn ferrite are beneficial for the reduction of P cv . • FSC0NZ possessed optimum P cv = 38 mW/cm 3 (at 800 kHz, 10 mT, and 25 °C).

High-temperature CO2 methanation over structured Ni/GDC catalysts: Performance and scale-up for Power-to-Gas application

This paper investigates the performance of 25 wt% Ni/GDC catalyst supported on ceramic monolith (MO) and open-cell foam (FO) towards the conversion of CO2 to CH4 at bench-scale level (CO2 flow rate = 78–319 NL·h−1). Both structured catalysts were prepared by the In Situ-Solution Combustion Deposition (IS-SCD) method to coat thin, uniform and high-resistance catalytic layers (Ni/GDC). Catalysts were characterized by XRD, TEM, SEM, and adhesion tests. Temperature profiles in axial and radial direction were registered and discussed. The experimental results highlighted the effect of the geometry of the support on the thermal profile of the catalytic bed and, consequently, on the catalytic performance towards CO2 methanation. For the investigated quasi-adiabatic conditions, the monolith-supported sample enabled a favourable temperature distribution, leading to higher performances (χCO2 = 70.3%; FCH4, OUT = 2.6 NL·cm−3·h−1) compared to the foam-based catalyst (χCO2 = 52.0%, FCH4, OUT = 2.2 NL·cm−3·h−1). Besides, Ni/GDC-MO catalyst showed high stability for 50 h of time-on-stream under daily start-up and shut-down cycles.

Quasi-Solid-State Dual-Ion Sodium Metal Batteries for Low-Cost Energy Storage

Summary Dual-ion sodium metal||graphite batteries are a viable technology for large-scale stationary energy storage because of their high working voltages (above 4.4 V versus Na/Na+) and the low cost of electrode materials. However, traditional liquid electrolytes generally suffer from severe decomposition at such a high voltage, which results in poor cycle life. Herein, we report a stable dual-ion sodium metal battery employing a multifunctional gel polymer electrolyte, which was facilely prepared by in situ polymerizing an ethoxylated pentaerythritol tetraacrylate monomer in an optimized liquid electrolyte with fluoroethylene carbonate as co-solvent and 1,3-propanesultone as additive. This quasi-solid-state electrolyte not only exhibits high oxidative resistance and constructs stable protective layers on the electrode surfaces but also effectively facilitates homogeneous anion and cation fluxes and suppresses the sodium dendrite growth. The as-developed quasi-solid-state dual-ion batteries delivered a high capacity with long cycle life, which could be applied for low-cost energy storage.

Electrically high-resistance liquid crystal micro-lens arrays with high performances for integral imaging 3D display

In this paper, we propose a high-resistance (Hi-R) liquid crystal (LC) micro-lens arrays (MLAs) with a low operating voltage and a controllable focal length for integral imaging (II) 3D display. The focal lengths of the Hi-R LC MLAs can be effectively controlled by applying different operating voltages and driving frequencies. The experimental results indicate that the focal lengths can be adjusted from 4.27 mm to 2.88 mm when the operating voltage applied to the Hi-R LC MLAs increases from 1.8 Vrms to 2.8 Vrms at the driving frequency of 130 kHz. Compared with the II 3D display by using ITO circular-hole electrodes-based or Al circular-hole electrodes-based LC MLAs without Hi-R layer, the II 3D display based on the Hi-R LC MLAs with Al circular-hole electrodes can reveal clear 3D scenes at the corresponding center depth plane (CDP) when a low operating voltage is applied to the Hi-R LC MLAs. Furthermore, the generated elemental images with different depths can be reconstructed at different CDPs by electrically controllable focal lengths of the Hi-R LC MLAs, and these 3D scenes can be realized the switchable display in the same II 3D display system, which can effectively present the optical performance of the II 3D display.

Effects of substrate temperature and SnO2 high resistive layer on Sb2Se3 thin film solar cells prepared by pulsed laser deposition

Sb2Se3, an emerging promising binary compound semiconductor, was prepared at different substrate temperatures by pulsed laser deposition for thin film solar cells for the first time. In this work, CdS and Sb2Se3 films were subsequently deposited by pulsed laser deposition to simplify the process. Film properties and device performance, closely related to the substrate temperature, were characterized by thermal gravimetric analysis, X-ray diffraction, UV–Vis–NIR spectrophotometer, scanning electron microscope, light and dark current density-voltage, external quantum efficiency and capacitance-voltage, respectively. Results indicate that Sb2Se3 solar cells film deposited at 500 °C is better, with a better efficiency of 3.58%. Furthermore, SnO2 high resistive layer was introduced into Sb2Se3 solar cell to improve the junction quality, leading to a champion device efficiency of 4.41%.

APPLICATION OF 2D RESISTIVITY METHOD FOR DAM SITE INVESTIGATION IN MIRAKAN AREA, QUSHTAPA DISTRICT, ERBIL, IRAQI KURDISTAN REGION

ABSTRACTSubsurface investigations have significant and substantial effects on the design of dams or any hydraulic structures. The proposed dam is located to the north of Mirakan village within Qushtapa district, Erbil governorate, Iraq. 2D resistivity method was applied to determine the suitability of the Mirakan site for dam construction. The results (Pseudo-sections) indicated that the top surface layer of the studied area shows medium to high resistivity which ranges from 75 to more than 360 ohm.m, and it consists mainly of coarse grain materials like gravels, pebbles and, boulders, while in some location fine grain materials like clays and silts appeared. The thickness of this top surface, recent sediment is ranging from 8 to 18 m. The middle part of the Pseudo-sections displays a layer of high resistivity ranges 40– 65 ohm.m, it has been detected within Bi Hassan Formation; it is mainly composed of the conglomerate. The lower part of the pseudo-sections illustrates a layer of low resistivity which represents the fine material deposits of the Bi Hassan Formation and the resistivity ranges from 7–20 ohm. m. There are no faults have been detected in this location as well as there is no evidence of the existence of cavities and there are no risky sources. So, the study area is suitable for dam construction. To sum up, the results reveal that the studied area has the potential to withstand the weight of the dam and natural disasters.

Sb2Se3 thin film solar cells prepared by pulsed laser deposition

Sb2Se3, a very promising absorber layer for thin film solar cells, has attracted more and more attention because of its special structural and optical properties. In this work, pulsed laser deposition (PLD), a simple and effective technique, was used to deposit CdS/Sb2Se3 solar cells for the first time. Results show that the grain size is 200–250 nm, the bandgap is calculated to be 1.21 eV and Sb2Se3 thin film with thickness of 400 nm is more suitable for solar cells. To reduce reflection loss, lattice mismatch and shunt pathways, SnO2 high resistive layer was introduced into Sb2Se3 solar cells. Due to the introduction of SnO2, overall performance, especially Jsc, was improved and champion device was achieved with efficiency of 4.77%.

Seepage investigations of heterogeneous soils beneath some buildings using geophysical approaches: example from southwestern Nigeria

Buildings along the flood plain of River Osun, southwest Nigeria, are usually thought of as been a safe haven for residence over the years. But in recent times with vast (increasing) population and growing urbanization, some of the buildings currently experience structural damages not related to constructional designs but rather ground conditions around building foundations. The ground conditions (seepages in this case) and how it influences properties of soils (water moisture, permeability etc.) to support the foundation of buildings. This paper attempts to map out seepages in heterogeneous soils around buildings in Erinle, southwest Nigeria where building cracks probably as a result of water seepages from subsurface through fissures and fractures where noticed. These cracks are a probable manifestation of a weakened foundation that could overtime result to a collapse, hence the need to investigate seepage prone zones. To achieve this, electrical resistivity (ER) and Electromagnetic Ground Penetrating Radar (EM-GPR) surveys were made along affected buildings to map out possible causes of deterioration. Geo-sections (analyzed ER data) shows high resistivity layer (topsoil) underlain by low resistivity layer (weathered basement) confirmed by planer reflections (topsoil) and fairly smooth to smooth reflections (weathered basement) in Radargrams (analyzed GPR data). An integration of the geo-section and radargram produced from ER and GPR data shows that buildings along traverses 1, 2, 3 and 5 is most prone to seepages especially as it exhibits very low anomalously resistivity values (< 25 Ωm) but this is not the case for buildings along traverses 4, 6, 7 and 8.