Interactive interpretation of airborne gravity, magnetic, and drill-hole data within the crustal framework of the northern Western Desert, Egypt

Mohamed, Haby S.; Senosy, Mahmoud M.; Zaher, M. A.

doi:10.1016/j.jappgeo.2016.09.002

Cited by 16 publications

(6 citation statements)

References 16 publications

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“…Several studies (e.g., Ginzburg et al 1981;Marzouk 1988;Saleh et al 2006;Abdelwahed et al 2013;Mohamed et al 2016;Corchete et al 2017) have been performed to identify the crustal thickness in the Sinai Peninsula. They used different geophysical methods (e.g., seismic refraction, gravity, and magnetic); however, they could not completely estimate the depths of the basement surface and the discontinuities of Conrad and Moho.…”

Section: Introductionmentioning

confidence: 99%

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

2022

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The Sinai Peninsula is a subplate located between the African and Arabian plates. It is an important subplate in the world; however, this region is poorly understood because of the shortage of geophysical data. Thus, this study focuses on built a three-dimensional (3D) high-resolution forward model of the crustal thickness with a new tectonic model and structural evaluation of the Sinai Peninsula to understand this area tectonically and determine its lithospheric and crustal thicknesses. Qualitative and quantitative interpretations of Bouguer gravity, reduced-to-the-pole (RTP) aeromagnetic, and earthquake data are explained to achieve the goals of this study. Two-dimensional (2D) interactive sequential modeling of gravity data is performed along with some well-selected profiles with existing crustal layer depth points from previous works in the studied region. Seventeen 2D models are constructed and used to determine the basement, Conrad (lower crust boundary), and Moho (upper mantle boundary) depths and to build a 3D model. Accuracy of the 3D built model is evaluated by extracting observed, calculated, and residual gravity anomaly maps. The results show that the basement rocks appear on the surface in the South of Sinai and deepen (down to 4.5 km) toward the North. The Conrad surface varies approximately from 16 km (in the northeast and southwest of Sinai) to 22.8 km (in the southeast). The Moho surface depth (i.e., crustal thickness) varies approximately from 28.8 to 34.2 km, and it deepens toward the northeastern and southwestern parts of Sinai. A tentative basement structure map is constructed from the horizontal gradient (H-gradient) filter and the 3D Euler deconvolution of the Bouguer gravity and RTP aeromagnetic data. Correlation between the geological background of the study area and the obtained results suggests that the Sinai Peninsula is tectonically active, mainly in its southern portion due to the tectonic movements along the Gulf of Suez and the Gulf of Aqaba. The crustal thickness increases southward and thins northward.

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Section: Introductionmentioning

confidence: 99%

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

2022

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“…These subtle structural features can however be delineated using aeromagnetic data, particularly when several attributes of magnetic maps are deployed. In general, potential geophysical methods have proved very effective for providing useful information known to guide various exploration campaigns, be it regional hydrogeological studies (Batista-Rodriguez et al, 2017), economic mineral or oil and gas exploration (Mohamed et al, 2016;Di Massa et al, 2018, Olawale andTemitayo, 2020). Results of aeromagnetic modeling of the subsurface in parts of the Lower Benue by Obi et al (2010) revealed the presence of subsurface intrusives (mostly rhyolites and basalts).…”

Section: Sedimentary Development Of the Benue Troughmentioning

confidence: 99%

Determination of sediments thickness in part of Lower Benue Trough, Nigeria, from the residualization of aeromagnetic data: Implication for diversification of the Nigerian economy

Okwueze¹,

Okiwelu²,

Akpan³

2020

Appl. J. Phys. Sci.

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Aeromagnetic data were used in the study to determine the sediment thickness in the Lower Benue Trough. To achieve the objectives of the study, geophysical techniques were employed to analyze four aeromagnetic maps on a scale of 1:100,000, covering parts of the Lower Benue Trough. These include map merging, polynomial fitting, directional derivatives and forward modeling. Nine (9) profiles were modeled to determine sediment thickness, presence of possible intrusives and the subtle structural features and their trend within the study area. Results from this study revealed the existence of many intrusives which were majorly granite and basalt rocks which suggests complex tectonic events which accompanied the evolution of the Benue Trough. Lineament orientation revealed is majorly NE-SW direction and other directions were NW-SE, E-W and N-S. A sedimentary thickness ranging from 7 to 10 km were suggested by a 3D forward modeling, and this estimated depth did not coincide with an average of 5 km suggested by earlier researchers. Huge variations within the basement complex are however induced by the presence of horst structures as well as graben and this is profound within the depocenters where sedimentary pile is thicker. Magnetic sources within the sediment in Abakiliki, Udi and Nkalagu areas have potentials for hydrocarbon accumulation due to the thickness of the sediments in these parts of the study area. However, Bansara area reveals the presence of lots of intrusives, indicating high geothermal regimes that may not be favourable for hydrocarbon accumulation but have high potentials for solid mineral resources. Therefore, the Bansara area is recommended for organised and formal solid mineral exploration, which can apparently diversified the economy of Nigeria.

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“…It is therefore useful for finding buried geological objects and structures, such as igneous intrusions as a heat source of geothermal system; and some faults that usually control the existance of geothermal manifestation [12][13][14]. The measurement of gravity on land and in the air using airborne gravity for geothermal exploration has rapidly grown [15]. However, the clarity of the appearance of those geological features is largely determined by the distribution of gravity measurement points.…”

Section: Gravity Measurementmentioning

confidence: 99%

The Effect of Gravity Measurement Distribution Points on Interpretation of Gravity Data in the Gunung Endut Geothermal Prospect Area, Indonesia

Supriyanto

Rokhmatuloh

Sobirin

et al. 2018

GEOMATE

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ABSTRACT:The geothermal prospect located at Gunung Endut was investigated in 1980s based on reconnaissance surveys, primarily on geological and geochemical aspects. Then in 2006 a gravity measurement with 247 stations was carried out. However, due to the distribution of the gravity station was less than optimal, interpretation of gravity data was not suitable with the geological situation that support geothermal system. To ensure this, we have carried out a new gravity survey with 134 random stations distribution but remained concentrated on hot spring locations. Data from both measurements were processed by the same treatment starting from pre-processing with some standar corrections to obtain complete Bouguer anomaly, then continue by filtering process to separate regional and residual gravity anomaly using Butterworth filter in a wavenumber domain. Residual gravity anomaly map obtained by random position of stations is more resemble to the geological features developed in the prospect area. The contrast boundaries of the residual gravity anomaly value coincide with the fault-line structures recorded in the surface geological data. This result is better when compared with previous measurements. This study shows that there is a significant influence of the distribution pattern of the gravity stations which affects the conformity with the geological data. Based on the new interpretation result, the structural features in the prospect area are characterized by the complex fault structures that intersected each other mainly close to the surface manifestations. This intersection area is expected to be an enhanced permeability zone so that the hydrothermal fluid can flow to the surface. The interpretation of new gravity data combined with the results of geochemical analysis can be used for more understanding of the geothermal system beneath Gunung Endut prospect area.

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Interactive interpretation of airborne gravity, magnetic, and drill-hole data within the crustal framework of the northern Western Desert, Egypt

Cited by 16 publications

References 16 publications

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

Determination of sediments thickness in part of Lower Benue Trough, Nigeria, from the residualization of aeromagnetic data: Implication for diversification of the Nigerian economy

The Effect of Gravity Measurement Distribution Points on Interpretation of Gravity Data in the Gunung Endut Geothermal Prospect Area, Indonesia

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