Structural study using 2D modeling of the potential field data and GIS technique in Sohag Governorate and its surroundings, Upper Egypt

Ghazala, Hosni; Ibraheem, Ismael M.; Lamees, M.; Haggag, Menna

doi:10.1016/j.nrjag.2018.05.008

Cited by 13 publications

(3 citation statements)

References 11 publications

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“…Power spectrum analysis represents one of the most common methods to figure out the depth of gravity sources (Spector and Grant, 1970). The gravity maps' power spectrum is the product of their 2D Fourier transform and complex conjugate (Ghazala et al, 2018). The average depth of the gravity source can be related to specific features in the radially averaged power spectrum.…”

Section: • Power Spectrum Analysismentioning

confidence: 99%

Identifying the geological structure of the Garyan area in northwest Libya using eigen-6c4 satellite gravity data

Trepil

2024

AGG

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Satellite gravity data can be used in this study to characterise hitherto unexplored regions and enhance scientific understanding of the studied area. However, the geological ambiguity of the study area makes it challenging to figure out the geological interpretation within and around the area. Therefore, this work focused on the Garyan area in the northwest part of Libya for the purpose of identifying geological structures. The Garyan region is a part of Jabal Nafusah (central Jabal) due to its geographic location and the character of the escarpment. The gravity data was analysed, designed, and developed into a geophysical model using the Oasis Montaj programme. Several analytic techniques are applied to gravity datasets for subsurface structure investigation, including (TDR) tilt derivative, (THG) total horizontal gradient, (PS) Power spectrum technique, (AS) Analytical signal, and (ED) Euler deconvolution. The results identified the presence of faults trending in different orientations (N-S, NW-SE, E-W, NNW-SSE, NE-SW), with source depths ranging between 300 and 2300 m, which indicates a complex tectonic history in the area. Clearly, this work will reduce the ambiguity of geological interpretations and provide better information on the dominant trends for future exploration activities in the study region. It also detects the contacts of density variation and estimates the depth of the gravity sources from satellite-EIGEN-6C4 gravity data.

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Section: • Power Spectrum Analysismentioning

confidence: 99%

Identifying the geological structure of the Garyan area in northwest Libya using eigen-6c4 satellite gravity data

Trepil

2024

AGG

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“…2 The methodology flowchart. spectrum is the product of their 2D Fourier transform and complex conjugate (Ghazala et al, 2018). According to Equation (1), it is a function of wavelength for both the s and c directions.…”

Section: Power Spectrum Analysismentioning

confidence: 99%

Delineating structure elements and depth of sources using an aeromagnetic data set in the Tarhona region, Nortwest Libya

Trepil¹

2023

Acta Geodynamica Et Geomaterialia

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The Tarhona region, which is situated within the northwestern part of Libya, is a part of Jabal Nafusah (eastern Jabal) due to its geographic location and the character of the escarpment. It is restricted to the east by longitudes 13.00⁰ to 14.00⁰ east and to the north by latitudes 31.45⁰ to 32.25⁰ north. The analysis and interpretation of magnetic data can depict previously unknown regions and improve scientific knowledge of the study area. However, the geological ambiguity of the study area makes it challenging to figure out the geological interpretation within and around the area. Therefore, this study aims to delineate structural elements and depths of sources using an aeromagnetic dataset in the Tarhona region in northwest Libya. Magnetic dataset is reduced to the pole (RTP) within Oasis Montaj. Different filters were utilised to magnetic data, including Total horizontal gradient (THG), CET grid analysis, Power spectrum analysis (PS), Analytic signal (AS), 3D Euler deconvolution (ED), and Tilt derivative (TDR). The result shows various fault tendencies in the N-S, NNW-SSE, and NW-SE directions. The depth of faults was determined from 2000 to above 8000 m after applying 3D Euler deconvolution with the TDR derivative. In addition, a rose diagram was prepared for delineating the trend of the faults using edge detection techniques (THG, CET grid analysis, AS, Euler deconvolution, and TDR). The delineation of subsurface structures in the region is helpful for further hydrocarbon exploration.

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“…The combination of the NW-SE fractures has been explained as conjugated sets due to the compression stress produced in the north-northeast (NNE) direction [35]. The presence of some intrusive bodies of granodiorite rock type in the area of study has been identified [36].…”

Section: Location Geology and Structure Of The Study Areamentioning

confidence: 99%

Edge Detectors as Structural Imaging Tools Using Aeromagnetic Data: A Case Study of Sohag Area, Egypt

Ibraheem

Haggag²,

Tezkan

2019

Geosciences

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The present study was designed to give a clear and comprehensive understanding of the structural situation in the Sohag region and surrounding area by applying several edge detectors to aeromagnetic data. In this research, the International Geomagnetic Reference Field (IGRF) values were removed from the aeromagnetic data and the data obtained were then reduced to the north magnetic pole (RTP). A combination of different edge detectors was applied to determine the boundaries of the magnetic sources. A good correlation was noticed between these techniques, indicating that their integration can contribute to delineating the structural framework of the area. Consequently, a detailed structural map based on the results was constructed. Generally, E-W, N45-60E, and N15-30W directions represent the main tectonic trends in the survey area. The structural map shows the existence of two main basins constituting the most probable places for hydrocarbon accumulation. The results of this study provide structural information that can constitute an invaluable contribution to the gas and oil exploration process in this promising area. They show also that the decision in choosing the location of the drilled boreholes (Balyana-1 and Gerga) was incorrect, as they were drilled in localities within an area of a thin sedimentary cover.

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Structural study using 2D modeling of the potential field data and GIS technique in Sohag Governorate and its surroundings, Upper Egypt

Cited by 13 publications

References 11 publications

Identifying the geological structure of the Garyan area in northwest Libya using eigen-6c4 satellite gravity data

Identifying the geological structure of the Garyan area in northwest Libya using eigen-6c4 satellite gravity data

Delineating structure elements and depth of sources using an aeromagnetic data set in the Tarhona region, Nortwest Libya

Edge Detectors as Structural Imaging Tools Using Aeromagnetic Data: A Case Study of Sohag Area, Egypt

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