DETECTION OF FRACTURED AQUIFER USING COMBINATION OF RESISTIVITY AND INDUCED POLARIZATION ANALYSIS

2015 ◽  
Vol 76 (15) ◽  
Author(s):  
Mohamed Azwan Mohamed Zawawi ◽  
Noorellimia Mat Toridi ◽  
Aimrun Wayayok
Keyword(s):  
Clayey Soil ◽  
Induced Polarization ◽  
Polarization Analysis ◽  
Fractured Aquifer ◽  
Low Resistivity ◽  
Groundwater Occurrence ◽  
Electrical Survey ◽  
Geological Formation ◽  
Subsurface Resistivity

Subsurface geological formation is essential in investigating the groundwater occurrence. The formation can be determined from subsurface resistivity value through electrical survey. However, there is ambiguity in interpreting the subsurface resistivity. Therefore the purpose of this study is to delineate the subsurface geological formation through combination of resistivity and induced polarization analysis. The type of geological formation is determined from resistivity analysis and well lithology. Meanwhile the fracture, water in clayey soil and groundwater occurrence is identified through combination of resistivity and induced polarization analysis.  It has been identified that the study areas consist of fractured aquifer. Possible groundwater fractured area can be indicated by low resistivity ranged from 700 to 2000 Ωm and overlapped with low chargeability ranged from 1 msec to 2 msec. This study provides useful information on nature of groundwater occurrence especially fractured aquifer.

scholarly journals Delineation of Seawater Intrusion Using Geo-Electrical Survey in a Coastal Aquifer of Kamala Beach, Phuket, Thailand

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 506 ◽  
Author(s):  
Sakanann Vann ◽  
Avirut Puttiwongrak ◽  
Thongchai Suteerasak ◽  
Werapong Koedsin
Keyword(s):  
Seawater Intrusion ◽  
Coastal Aquifer ◽  
Empirical Relationship ◽  
Time Lapse ◽  
2D Inversion ◽  
Hydrologic Systems ◽  
Electrical Survey ◽  
Clay Layers ◽  
Sample Measurement ◽  
Subsurface Resistivity

The coastal areas of Phuket Island are facing the risk of seawater intrusion, because intense anthropic activity due to urbanization and the expansion of tourism influences coastal hydrologic systems. Indeed, the Kamala sub-district—on the western part of Phuket Island—is a well-known and attractive destination for tourists. Previous research indicates that there is likely to be a seawater intrusion in Kamala. The main purpose of this study was to delineate the seawater intrusion problem in a coastal aquifer in Kamala. Geo-electrical surveys of four lines were successfully conducted in the study area. Two-dimensional (2D) inversion models from the resistivity data show high-resolution subsurface resistivity anomalies of seawater intrusion. The concentration of the seawater intrusion decreases eastward toward the inland areas. Based on a sample measurement, the contaminated zone of seawater has a resistivity value smaller than 30 Ohm-m, and the empirical relationship between the formation conductivity and fluid conductivity of the study area was established. Finally, time-lapse Electrical Resistivity Imaging (time-lapse ERI) was conducted to prove that there was no presence of clay layers in study area; thus, the low resistivity plumes (smaller than 30 Ohm-m) were scientifically interpreted as being seawater intrusion.

scholarly journals IDENTIFIKASI PATAHAN MANADO DENGAN MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI WENNER- SCHLUMBERGER DI KOTA MANADO

2015 ◽  
Vol 17 (1) ◽  
pp. 142
Author(s):  
Helen Shintia Frans ◽  
As’ari As’ari ◽  
Gerald H. Tamuntuan
Keyword(s):  
Data Processing ◽  
Fault Identification ◽  
Low Resistivity ◽  
Resistivity Method ◽  
North Sulawesi ◽  
Subsurface Resistivity

IDENTIFIKASI PATAHAN MANADO DENGAN MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI WENNER- SCHLUMBERGER DI KOTA MANADO ABSTRAK Peta Geologi lembar Manado Sulawesi Utara, menunjukkan bahwa daerah penelitian Kelurahan Singkil 2 Kecamatan Singkil Kota Manado, merupakan daerah yang dilewati oleh Patahan Manado. Identifikasi patahan dieksplorasi secara geofisika menggunakan metode geolistrik tahanan jenis dengan konfigurasi Wenner- Schlumberger. Akuisisi data menggunakan Multichannel and multielectrode resistivity and IP meter 46 simultaneous channel merek MAE X612-EM. Pengukuran dilakukan pada 3 lintasan pengukuran, dengan jarak antara setiap lintasan satu dengan yang lain adalah 100 meter. Panjang lintasan 1 dan 3 adalah 240 meter sedangkan lintasan 2 adalah 480 meter. Pengolahan data dilakukan dengan menggunakan software RES2DINV yang hasilnya berupa tampang lintang resistivitas bawah permukaan 2 dimensi. Berdasarkan pengolahan dan analisis nilai resistivitas rendah (  pada lintasan 1, 2, dan 3 yang memotong perlapisan antara batuan yang memiliki nilai resistivitas yang lebih tinggi bidang lemah cenderung terbuka pada bagian permukaan tanah yang diduga sebagai rekahan dengan kedalaman (3-33,8) meter dari permukaan tanah. Kata Kunci : Wenner- Schlumberger, Software RES2DINV, Patahan Manado MANADO’S FAULT IDENTIFICATION BY USING GEOELECTRIC METHOD WENNER- SCHLUMBERGER CONFIGURATION AT MANADO ABSTRACT Geology map of Manado, North Sulawesi shows that research region at Singkil 2 Village Subdistrict Singkil is a track of Manado’s Fault. Identification of this  fault use geoelectric geophysics resistivity method with Wenner- Schlumberger. Multichannel and multielectrode resistivity and IP meter 46 simultaneous channels MAE brand X612- EM is device for acquisition of data. The measurements were taken at three tracks  to the distance between each track one another is 100 meters. The length of first track and third track is 240 meters, and second track is 480 meters. The data Processing was performed with RES2DINV software that results 2D image subsurface resistivity. Based on the data processing and analyses of low resistivity values (  on the track 1, 2 and 3 are cut layers of rock that have higher resistivity values to from fractures tend to open on the ground of suspected fracture at a depth is 3 meters to 33,8 meters from the surface. Keywords : Wenner- Schlumberger, RES2DINV, Manado Fault.

Coupling, masking and detection for induced polarization surveys in areas where low resistivity surface layers occur

1972 ◽  
Vol 3 (4) ◽  
pp. 1 ◽  
Author(s):  
J.G. Baird
Keyword(s):  
Western Australia ◽  
Electromagnetic Coupling ◽  
Induced Polarization ◽  
Electrode Configuration ◽  
Special Consideration ◽  
Signal Attenuation ◽  
Surface Layers ◽  
Sulphide Mineralization ◽  
Low Resistivity

Detection of sulphide mineralization by Induced Polarization in many areas of Western Australia is restricted by thick, low resistivity, weathered zones. Signal attenuation due to electromagnetic coupling and masking requires special consideration in design of electrode configuration. Two field examples are discussed.

scholarly journals EVALUATION Of GROUNDWATER VULNERABILITY IN FRACTURED AQUIFER USING GEOELECTRIC LAYER SUSCEPTIBILITY INDEX AT OJU, SOUTHERN BENUE TROUGH NIGERIA

2020 ◽  
Vol 4 (2) ◽  
pp. 63-67
Author(s):  
M. O. Eyankware ◽  
A. O. I. Selemo ◽  
P.N. Obasi ◽  
O. M Nweke
Keyword(s):  
Groundwater Contamination ◽  
Groundwater Vulnerability ◽  
Aquifer Vulnerability ◽  
Fractured Aquifer ◽  
Benue Trough ◽  
Longitudinal Conductance ◽  
Fractured Aquifers ◽  
Groundwater Occurrence ◽  
Electrical Sounding ◽  
Geoelectric Layer

A combination of geoelectric and hydrogeologic concept was used in the assessment of groundwater vulnerability in fractured aquifers of Oju and environs. The study area is underlain by the sediments of the Asu River Group, Southern Benue Trough Nigeria. A total of twenty-seven (27) Vertical Electrical Sounding (VES) was carried out within the study area. Geoelectric parameters (layer, resistivity and thickness) of the overlying layers across the study area were determined and used to evaluate the vulnerability of the underlying aquifers. Three charts were compared using geo-electrically derived models; LC (Longitudinal Conductance), GLSI (geoelectric layer susceptibility indexing) and GOD (groundwater occurrence, overlying lithology and depth to the aquifer. Results obtained from LC revealed that the study area fell within the moderate category, GLSI showed that aquifer vulnerability were categorize within negligible to low category and GOD fell within low to moderate category. On the average, groundwater within the study area is considered moderate vulnerable to groundwater contamination.

The polarizability of sand-gravel deposits according to the results of laboratory and field measurements

2019 ◽  
Vol 13 (1) ◽  
pp. 68-77
Author(s):  
V. A. Kulikov ◽  
S. A. Anoshina
Keyword(s):  
Water Saturation ◽  
Field Measurements ◽  
Field Work ◽  
Induced Polarization ◽  
Electrical Tomography ◽  
Geophysical Model ◽  
Electrical Survey ◽  
Kaluga Region ◽  
2D Data ◽  
Sand And Gravel

Тhe article describes electrical exploration aimed at studying the polarizability of sand-gravel deposits in the Kaluga region. On the one hand, laboratory tests of the polarizability of sand and sand-gravel mixes (SGM) were carried out, on the other hand, field electrical survey work on the wellknown manifestation of SGM. Samples of SGM were collected from 18 actively operating quarries in the Moscow and Kaluga regions for laboratory petrophysical measurements. Induced polarization (IP) measurements were conducted in time domain. The results showed that sand and gravel mixes are characterized by a rapid process of induced polarization. The minimum values are associated with pure sand samples and the level of polarizability increases with increasing gravel content in the sample. The maximum values of polarizability are achieved when the moisture content of samples is 1,5–2,5%, however SGM samples polarized stronger than pure sand samples all over the moisture range. The field work was performed by the method of vertical electrical soundings with measuring of IP along the well-known sand and gravel deposits in the Kaluga region. The profile step and spacing of the electrical survey installation are selected in such a way as to use the same grounding locations many times. A similar approach is used for multichannel measurements of electrical tomography and allows for further 2D data inversion. The induced polarization was measured in the frequency domain in the frequency range from 0.15 to 19 Hz. The results of the multi-frequency inversion showed the differentiation of the section by the time parameter τ. According to inversion data the geological-geophysical model was constructed. In the section, zones of increased polarizability associated with a gravel-pebble fraction, as well as zones with partial water saturation of sediments were identified. Thus, under the certain favorable conditions, the IP method allows to delineate zones enriched with gravel-pebble fraction within the SGM deposit.

Electrical signature of CO2-rich mineral groundwater systems - Application in the Ardennes, South-East of Belgium

2020 ◽  
Author(s):  
Agathe Defourny ◽  
Thomas Kremer ◽  
Arnaud Collignon ◽  
Patrick Jobé ◽  
Alain Dassargues ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Land Surface ◽  
Geophysical Methods ◽  
Induced Polarization ◽  
Fractured Aquifer ◽  
Near Surface ◽  
Polarization Tomography ◽  
Future Supply ◽  
Uplift Zone ◽  
Drilling Operations

<p>CO<sub>2</sub>-rich mineral groundwaters have been exploited for centuries for both bottling and thermal activities. The detection and understanding of productive areas is therefore of great interest to manage future supply in a sustainable way. CO<sub>2</sub>-rich mineral water systems are complex since they usually involve an intricated network of water bearing fractures enabling the uplift of CO<sub>2</sub>-rich groundwater to the surface, a process that is still poorly understood. Geophysical prospection is crucial to detect potential uplift zones and to address corresponding uncertainties before drilling operations.</p><p>In this context, non - to minimally - invasive near-surface geophysical methods can prove to be efficient. The objective of this contribution is to assess the ability of the induced polarization method, combined with the electrical resistivity technique, to make the distinction between CO<sub>2</sub>-rich groundwater from non-gaseous groundwater.</p><p>Several combined electrical resistivity and induced polarization tomography profiles were performed in the Ardennes (Belgium) where thousands of CO<sub>2</sub>-rich groundwater springs are observed. The profiles were all set immediately above known uplift zones. Inversion results were consistent between all profiles and important contrasts in both electrical resistivity and chargeability distributions in the vicinity of the uplift zone were observed, which were also reflected in the normalized chargeability sections computed on the basis of the measured data.</p><p>Low resistivity vertical contrasts extending in depth were observed and interpreted as saturated fractures enabling the uplift of deep groundwater to the surface. In addition, high chargeability anomalies appeared directly close to the CO<sub>2</sub>-rich groundwater resurgence. Those anomalies are thought to be associated to the presence of metallic oxides and hydroxides, as a result of dissolved metallic species precipitation in the upper part of the fractured aquifer due to the pressure decrease and change in redox conditions in up-flowing groundwater towards the land surface.</p><p>We conclude that the combined interpretation of electrical resistivity and induced polarization datasets is a very promising method for a more robust prospection of naturally sparkling groundwater.</p>

scholarly journals Geoelectric Exploration of the Purísima-Rumicruz District, Jujuy Province, Argentina

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Luciano López ◽  
Horacio Echeveste ◽  
Mario Tessone ◽  
Marta Alperín ◽  
Ricardo Etcheverry
Keyword(s):  
Black Shale ◽  
Host Rock ◽  
Depositional Environment ◽  
Shear Bands ◽  
Induced Polarization ◽  
Low Resistivity ◽  
Low Degree ◽  
Lower Ordovician ◽  
High Concentrations

Purísima-Rumicruz district consists of several polymetallic veins, rich in copper and lead. The veins have a breccia texture and are located in shear bands, with locally high concentrations of sulfides in a carbonatic gangue. The host rock of the veins consists of a black shale sequence with thin levels of fine sands, with a low degree of metamorphism, and corresponds to the Acoite formation (Lower Ordovician). The depositional environment was an open clastic platform where storm processes prevailed. An exploratory program using induced polarization and resistivity with the dipole-dipole method was carried out with the objective of establishing geoelectric anomalies in depth, which would permit the identification of exploratory targets. The group of veins was divided into three sectors:Purísima,El Brechón, andLa Nueva. Low-resistivity values correspond to faulty zones, some of which are related to surface veins. The presence of diagenetic pyrite in the shales of Acoite formation considerably increases background chargeability (induced polarization) values. However, small chargeability anomalies associated to low-resistivity values represent exploratory targets for the Purísima-Rumicruz district.

scholarly journals Distribution mapping of metal sediment using polarization data interpretation on the field “X” in PT Newmont Nusa Tenggara (PT NNT)

2016 ◽  
Vol 4 (01) ◽  
pp. 78
Author(s):  
Sukri Arjuna ◽  
Adi Susilo ◽  
Sunaryo S
Keyword(s):  
Data Interpretation ◽  
Research Area ◽  
Induced Polarization ◽  
Electrode Spacing ◽  
Polarization Data ◽  
Geophysical Research ◽  
Low Resistivity ◽  
Andesite Basalt ◽  
Geological Information ◽  
Distribution Mapping

<span>Geophysical research has been done on mapping distribution of metal deposits in the field "X" PT <span>Newmont Nusa Tenggara using induced polarization geoelectric method pole-dipole <span>configuration. Measurements performed using IRIS intrument type Elrec Pro where measurements <span>of seven lines with length 2.3 km and electrode spacing 100 m. Induced polarization data further<br /><span>analyzed by using Res2dinv version 3.56 and Surfer 10. Interpreted based on the parameters of <span>chrageability and resistivity that correlated with regional geological information from the study <span>area. As a result, the structure of rocks beneath the surface lithology research area consists of five <span>units major rock that is tuffan claystone unit, sandstone tuffan unit, limestone unit, lava-breccia<br /><span>unit, and andesite-basalt unit. Mineralization zone at the high chargeabilitas at 69.7 to 155 msec <span>range supported by the low resistivity in the range of 4.21 to 26.5 Ωm which straight of anomalies <span>in West-East direction at the depth of ± 50-400 m.</span></span></span></span></span></span></span></span></span></span><br /></span>

Imaging magnetic microstructure with SEMPA

1993 ◽  
Vol 51 ◽  
pp. 1032-1033
Author(s):  
M. H. Kelley ◽  
J. Unguris ◽  
R. J. Celotta ◽  
D. T. Pierce
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Sandwich Structure ◽  
Magnetic Coupling ◽  
Polarization Analysis ◽  
Secondary Electrons ◽  
Magnetic Microstructure ◽  
Escape Depth ◽  
Scanning Electron

By measuring the spin polarization of secondary electrons generated in a scanning electron microscope, scanning electron microscopy with polarization analysis (SEMPA) can directly image the magnitude and direction of a material’s magnetization. Because the escape depth of the secondaries is only on the order of 1 nm, SEMPA is especially well-suited for investigating the magnetization of ultra-thin films and surfaces. We have exploited this feature of SEMPA to study the magnetic microstrcture and magnetic coupling in ferromagnetic multilayers where the layers may only be a few atomic layers thick. For example, we have measured the magnetic coupling in Fe/Cr/Fe(100) and Fe/Ag/Fe(100) trilayers and have found that the coupling oscillates between ferromagnetic and antiferromagnetic as a function of the Cr or Ag spacer thickness.The SEMPA apparatus has been described in detail elsewhere. The sample consisted of a magnetic sandwich structure with a wedge-shaped interlayer as shown in Fig. 1.

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