Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

GEOPHYSICS (33 journals)

Showing 1 - 31 of 31 Journals sorted by number of followers
Geophysical Research Letters     Full-text available via subscription   (Followers: 190)
GIScience & Remote Sensing     Open Access   (Followers: 55)
Reviews of Geophysics     Full-text available via subscription   (Followers: 50)
Journal of Remote Sensing & GIS     Full-text available via subscription   (Followers: 36)
Physics and Chemistry of the Earth, Parts A/B/C     Hybrid Journal   (Followers: 9)
Journal of the Earth and Space Physics     Open Access   (Followers: 7)
Artificial Intelligence in Geosciences     Open Access   (Followers: 6)
New Zealand Journal of Geology and Geophysics     Hybrid Journal   (Followers: 6)
Research in Geophysics     Open Access   (Followers: 5)
Geothermal Energy     Open Access   (Followers: 5)
Eos, Transactions American Geophysical Union     Open Access   (Followers: 5)
Journal of Earth Sciences and Geotechnical Engineering     Open Access   (Followers: 4)
Greenhouse Gases : Science and Technology     Hybrid Journal   (Followers: 4)
NRIAG Journal of Astronomy and Geophysics     Open Access   (Followers: 4)
Journal of Environmental & Engineering Geophysics     Hybrid Journal   (Followers: 3)
Geodesy and Cartography     Open Access   (Followers: 2)
Geodesy and Cartography : The Journal of Committee on Geodesy of Polish Academy of Sciences     Open Access   (Followers: 2)
GEOMATICA     Hybrid Journal   (Followers: 1)
Geology, Geophysics and Environment     Open Access   (Followers: 1)
Interpretation     Hybrid Journal   (Followers: 1)
Contributions to Geophysics and Geodesy     Open Access   (Followers: 1)
Near Surface Geophysics     Open Access   (Followers: 1)
Chinese Journal of Geophysics     Full-text available via subscription   (Followers: 1)
Transportation Geotechnics     Full-text available via subscription   (Followers: 1)
Results in Geophysical Sciences     Open Access  
Energy Geoscience     Open Access  
Geomechanics and Geophysics for Geo-Energy and Geo-Resources     Hybrid Journal  
Geodesy and Geodynamics     Open Access  
Acta Geologica Polonica     Open Access  
GeofĂ­sica internacional     Open Access  
GeoScience Engineering     Open Access  
Similar Journals
Journal Cover
Contributions to Geophysics and Geodesy
Journal Prestige (SJR): 0.199
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1335-2806 - ISSN (Online) 1338-0540
Published by Sciendo Homepage  [371 journals]
  • Petrophysical characterization and formation evaluation of sandstone
           reservoir: Case study from Shahd field, Western Desert, Egypt

    • Authors: Basem CHIKIBAN; Mostafa H. KAMEL, Walid M. MABROUK, Ahmed METWALLY
      Abstract: This paper aims to establish a complete workflow for a petrophysical evaluation to enhance and quantify hydrocarbon prospect and productivity of Shahd SE field, East Ras Qattara concession, Western desert, Egypt. The suggested workflow can, then, be used with the same steps and sequences for any petrophysical evaluation study. Well logs data from four wells were used for this study. The present data has drilled through three formations: (1) Bahariya Formation, which has been divided into two subzones; (I) Upper Bahariya, a shaly formation and (II) Lower Bahariya, the main reservoir present in our case study. (2) Kharita Formation, which consist of clean sand. We will evaluate the three most useful petrophysical parameters: (a) volume of shale (Vsh) using the gamma-ray (GR), (b) effective porosity Φeff) using the neutron log and the resulting volume of shale as an input, and (c) water saturation (Sw). Several equations were used to calculate the Sw. The best equation was Simandoux equation to put in consideration the shale model of the upper Bahariya. The results show that the net reservoir and net pay thicknesses were seen very promising in all four wells, all at the lower Bahariya Formation. The reservoir quality parameters "Effective Porosity (Φeff)" were almost the same for all four wells, as well as the high hydrocarbon saturation "Sh" for all four wells.
      PubDate: Fri, 30 Sep 2022 19:08:02 +000
       
  • Integrated geophysical and geochemical study for investigating the
           hydrocarbon potentiality of West Dakhla area, Western Desert, Egypt, as an
           extension of Libyan Kufra basin

    • Authors: Ashraf GHONEIMI; Nashat S. GAWISH, Muhammad NABIH
      Abstract: The present study represents an integrated study using the potential field maps and well geochemical data of the West Dakhla area in the western central area of the Western Desert area, Egypt. The potential field data are represented by the airborne gravity and total magnetic maps acquired by the Nuclear Material Authority (NMA), Egypt, on behalf of Dana Petroleum Company. The geochemical data consist of geochemical analysis in Ammonite-1 well that were done for source rock evaluation. Different processing techniques on the gravity and magnetic maps are carried out for separating the regional and residual separation and filtering. Modelling and Euler deconvolution tools are utilized for proposing the depth to basement and constructing basement-depth maps to infer the basin configuration of the study area. Before acquiring the present geophysical data, the study area wasn't subjected to any exploration investigations. Therefore, these data and this study are considered as the first efforts carried out and submitted for publication in this area. In addition, a comparison of the present basin is done with matched basins in southern Libya, where this basin is expected to have similar geological features. The study indicates that the studied basin may be a part of a wider basin extending in Egypt and Libya. This basin is expected to have the thickness and features that are favourable for hydrocarbon habitat. The geochemical analysis shows TOC values ranging from poor to very good source rock potentiality.
      PubDate: Fri, 30 Sep 2022 18:29:36 +000
       
  • A numerical approach to accurately estimate water resistivity (Rw) and
           saturation (Sw) in shaly sand formations

    • Authors: Ahmed M. METWALLY; Walid M. MABROUK, Ahmed Ismail MAHMOUD
      Abstract: In hydrocarbon reservoirs, the accuracy of hydrocarbon saturation depends on the precision of the water saturation and resistivity (Sw and Rw). A significant interpretation parameter is the resistivity of formation water (interstitial water or connate water which is, uncontaminated by the drilling mud that saturates the porous formation rock) because it is appropriate for the calculations of saturation (water and/or hydrocarbon) from basic resistivity logs. The most reliable way to determine this value is through the determination of the chemical composition or resistivity of uncontaminated connate water inside the formation. The saturation of water is the ratio between water volume to total pores volume and its determination accuracy has a great role in estimating hydrocarbon volume. However, the aims of this paper have two main folds, firstly, to introduce a complete review on water resistivity, saturation, and shale volume. Secondly, it presents a numerical method for the determination of resistivity of connate water and water saturation from the true resistivity of the formation using Schlumberger (1975) in shaly sand formations which require critical treatment compared to the clean sand reservoirs. To ensure its ability to determine both the resistivity and saturation of formation water, the technique was tested using synthetic and real field data.
      PubDate: Fri, 30 Sep 2022 18:27:33 +000
       
  • A comprehensive study for the airborne gamma-rays spectrometry results of
           Gabal El-Hassnawia, Central Eastern Desert, Egypt

    • Authors: Ahmed A. NIGM; Baher M. GHEITH, Mohamed A. SHAHEEN
      Abstract: The present study utilizes the airborne gamma-ray spectrometric data of Gabal El-Hassnawia and its vicinity in an attempt to refine the surface geological mapping and recognize the radioelements occurrences. The statistically analysed surface lineaments derived from the Landsat image proved that they are oriented to the NW, NNW, N–S, and ENE trends. Qualitatively, the highest radiometric levels are related to the younger granites, the intermediate levels are observed over the Hammamat sediments and the acidic metavolcanics while the low levels are coinciding with the metasediments, ultramafites and basic to intermediate metavolcanics. The composite images show a good close correlation with the geologically mapped rock units. The factor analysis proved that the radiometric variables uranium (eU), potassium (K) and thorium (eTh) as well as total count (TC) are highly correlated positively with each other. Three principal factors F1, F2 and F3 are extracted from the data and their scores were used in differentiating the rock types according to their radiometric levels; consequently, nine interpreted litho-radiometric units were identified. Three types of younger granites and two types of Hammamat sediments could be distinguished among the nine units. These units are subjected to statistical treatment with the goal of identifying the uranium occurrences that exceeds X + 2S and X + 3S as targets of exploration. Accordingly, it is found that the uranium province zones are related to the three types of granite (G1, G2 and G3), the second type of Hammamat sediment (H2) and more or less the acidic metavolcanics. The uranium migration indicated that the second type of Hammamat sediment (H-2) is the only unit that the uranium is migrated in whereas; the uranium is migrated out in all other units.
      PubDate: Fri, 30 Sep 2022 18:25:47 +000
       
  • Interpretation of gravity and magnetic data in the Central Indian Ocean

    • Authors: Sistla RAVI KUMAR; Shaik Kareemunnisa BEGUM
      Abstract: The crustal deformation in the Central Indian Ocean is due to major undulations of the oceanic crust, longitudinal fracture zones, and sea-floor topography. The gravity and magnetic data along with six long profiles across the Central Indian Ocean Basin on W–E tracks between 6°S – 1°S latitudes and 77°E – 90°E longitudes are used to study this deformation. It has been observed that the crustal depths obtained from spectral analysis of gravity and magnetic data are in good agreement with 2D forward gravity modelling results which supports seismic results. The computed seismic velocities for the sediments are 2.0 – 5.7 km/s and 6.1 – 7.7 km/s for the oceanic igneous layer and 8.3 – 8.5 km/s for the oceanic upper mantle are used to determine the densities of oceanic crust with the velocity-density relationship. The average basement depths for all the gravity and magnetic profiles are obtained as ~5 km with deviations of about 1 – 2 km from the mean and for the deeper marker, the crustal depths vary from 9 km to 12 km. In the case of curie isotherm, the crustal depths vary from 9 km to 12 km for all magnetic profiles which may indicate deformation. The crustal top depths vary in the range of 3.5 – 8 km (3.2 – 6 km) and the bottom depth varies in the range of 8.2 – 13.5 km (8.5 – 13 km) for magnetic field anomaly data using the spectral method (the Werner method). The crustal top depths vary in the range of 3.6 – 6.5 km and the bottom depth varies in the range of 7.5 – 11.5 km for free-air anomaly data using the spectral method. The above depths are almost correlated with interpreted 2D gravity modelling and available Seismic results.
      PubDate: Fri, 30 Sep 2022 18:24:30 +000
       
  • Hydrogeochemical and geophysical investigations to delineate underground
           water aquifer in arid regions: A case study, Gara oasis, Egypt

    • Authors: Mohamed NAZIH; Mohamed Mostafa GOBASHY, Zenhom SALEM, Khaled Soliman SOLIMAN, Ahmed AbdelHalim M. HASSAN
      Abstract: The goal of the present study is to investigate, delineate, and evaluate the shallow Miocene groundwater aquifer with vertical and lateral facies variations in the Gara oasis, western desert of Egypt. This oasis represents a typical arid region in North Africa. Through grid texture analysis, lineament detection, edge detection, thresholding, and identifying areas of structural complexity from the filtered residual reduced-to-pole magnetic anomaly map, it is possible to outline the fracture zones that principally control the groundwater aquifers and water flow in the area. The groundwater quality and quantity are examined hydro-geochemically through nine groundwater samples that were gathered from wells and springs distributed throughout the area around Gara Lake. Measurements of physio-chemical parameters (TDS, pH, and EC) are carried out and its spatial distribution is critically studied. The results reveal that the ion-exchange process caused by water-rock interaction is the dominant process. Furthermore, the main ions in the groundwater in the study areas were Na and Cl. This might be due to evaporation or halite dissolution with the upward flow of waters through the fractures from the deep aquifer of the Nubian sandstone to the shallow aquifer of the fractured Miocene limestone.
      PubDate: Fri, 30 Sep 2022 18:22:41 +000
       
 
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