Mapping the possible origin of anomalous saline water occurrence in Agbabu, Eastern Dahomey Basin, Nigeria: insights from geophysical and hydrochemical methods

Adeyemo, I. A.; Oladeji, E.O.; Sanusi, Sherif Olumide; Olayanju, G M

doi:10.1016/j.ringps.2022.100042

“…These data were used to map and model anomalies to identify anticline oil traps, salt domes, and structural conditions in the Qeshm area. This study analyzed and processed 78765 gravitational assessment stations (Adeyemo et al, 2022;Doulati Ardejani et al, 2011;Hosseini et al, 2013;Hosseini et al, 2014). The gravitational survey operation of the eastern areas of Qeshm island and its northern coasts from Sarkhun to Laitdan has been carried out in a region with an area of 120*100 square kilometers between the longitudes of 540-650 kilometers east and the latitudes of 560-640 kilometers north.…”

Section: Geographic and Geological Location Of The Qeshm Regionmentioning

confidence: 99%

Tilt Angle Filter Effect on Noise Cancelation and Structural Edges Detection in Hydrocarbon Sources in a Gravitational Potential Field

Hosseini

¹

,

Khah²,

Kianoush

³

et al. 2023

Preprint

0

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Noise cancelation is the process done to remove out-of-range anomalies and make better edge boundaries interpretation. One of the most challenging issues in describing gravitational maps is separating the anomalies related to shallow sources from the deep ones. Furthermore, Existing noise can make it arduous to separate shallow blurred boundaries. In this study in SE Iran, gravitational surveying was carried out in shallow areas from the west of Qeshm to the Hormuz islands in a regular network with a distance of one kilometer. The range of gravitational Bouguer was -297 to -330 mGal. Modeling and determining geometrical parameters revealed five negative anomalies from salt penetration. The residual gravity was computed by deducting gravitational effects related to deep sources from measured gravitational data. Correspondingly, estimating the boundary and edge of the subsurface masses will be better than local filters, and anomalies will be highlighted with more intensity. Furthermore, three major fault systems in the Zagros basin were determined as the primary origin of activity and expansion of Hormuz salt. Sensitivity analysis was employed utilizing analytical signals and maps of tilt angle filtering, which both revealed the same satisfying results of -297 to -330 mGal. In this article, the effect of the tilt angle local phase filter on a synthetic model was accomplished through numerical coding. As a result, Total Horizontal Derivative (THDR) provides location of salt intrusion in Qeshm area; whereas the best image of salt intrusion, in terms of feature edge illumination, presented by Analytical signal of residual gravity map.

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“…These data were used to map and model anomalies to identify anticline oil traps, salt domes, and structural conditions in the Qeshm area. This study analyzed and processed 78765 gravitational assessment stations (Adeyemo et al, 2022;Doulati Ardejani et al, 2011;Hosseini et al, 2013;Hosseini et al, 2014;Pham & Prasad, 2023). The gravitational survey operation of the eastern areas of Qeshm island and its northern coasts from Sarkhun to Laitdan has been carried out in a region with an area of 120*100 square kilometers between the longitudes of 540-650 kilometers east and the latitudes of 560-640 kilometers north.…”

Section: Geographic and Geological Location Of The Qeshm Regionmentioning

confidence: 99%

Tilt Angle Filter Effect on Noise Cancelation and Structural Edges Detection in Hydrocarbon Sources in a Gravitational Potential Field

Hosseini

¹

,

Khah²,

Kianoush

³

et al. 2023

Preprint

0

View full text Add to dashboard Cite

Noise cancelation is the process done to remove out-of-range anomalies and make better edge boundaries interpretation. One of the most challenging issues in describing gravitational maps is separating the anomalies related to shallow sources from the deep ones. Furthermore, Existing noise can make it arduous to separate shallow blurred boundaries. In this study in SE Iran, gravitational surveying was carried out in shallow areas from the west of Qeshm to the Hormuz islands in a regular network with a distance of one kilometer. The range of gravitational Bouguer was -297 to -330 mGal. Modeling and determining geometrical parameters revealed five negative anomalies from salt penetration. The residual gravity was computed by deducting gravitational effects related to deep sources from measured gravitational data. Correspondingly, estimating the boundary and edge of the subsurface masses will be better than local filters, and anomalies will be highlighted with more intensity. Furthermore, three major fault systems in the Zagros basin were determined as the primary origin of activity and expansion of Hormuz salt. Sensitivity analysis was employed utilizing analytical signals and maps of tilt angle filtering, which both revealed the same satisfying results of -297 to -330 mGal. In this article, the effect of the tilt angle local phase filter on a synthetic model was accomplished through numerical coding. As a result, Total Horizontal Derivative (THDR) provides location of salt intrusion in Qeshm area; whereas the best image of salt intrusion, in terms of feature edge illumination, presented by Analytical signal of residual gravity map.

show abstract

“…The gravitational data is measured by the appropriate filter method, and the residual maps are correctly interpreted. In that case, the results will provide helpful information for identifying the structural status of the oil traps (Adeyemo et al, 2022;Doulati Ardejani et al, 2011;Eppelbaum, 2019;Eshagh, 2021;Hosseini et al, 2013;Hosseini et al, 2014;Ojo et al, 2021;Sarma & Selvaraj, 1990). In potential field methods, there are three stages conception, processing, and interpretation, the most important of which is the interpretation of the results.…”

Section: Introductionmentioning

confidence: 99%

Boundaries Determination in Potential Field Anomaly Utilizing Analytical Signal Filtering and its Vertical Derivative in Qeshm Island SE Iran

Hosseini

¹

,

Khah²,

Kianoush

³

et al. 2023

Preprint

View full text Add to dashboard Cite

The analytical signal method and its derivatives can be explicitly calculated and assessed for analyzing and estimating the boundary of geological structures, such as faults or dikes, from potential field anomalies. Gravity field of the east of Qeshm Island and its north coast from Sarkhun to Latidan in SE Iran has been measured in one-kilometer regular network. The regional anomaly effects are deducted from the Bouguer anomaly, where it can get the residual anomalies which is the considered dataset used in this study. The Bouguer range is -297 to -330 milligals (mGal) applying filters and modeling. It was revealed that there are five negative anomalies caused by salt penetration in the region. Regional anomalies expectedly have a low spatial frequency and long wavelengths, while the residual anomalies associated with shallow sub-surface potentials have high spatial frequencies and short-wave wavelengths. Two different fault trends were observed comparing the artificial model using MATLAB coding, the real one, and the filtered residual anomaly map of the Qeshm region. Also, another fault trend is suggested in the east height of Oman, which is a possible place of salt penetration. Due to the limited dimensions (120 * 100 km) and the information obtained from the existing drillings, the depth of the anomaly resources can be examined up to 8 km. Due to the gravitational condition between the two domes of Qeshm saline and the bridge located in the Hara saline area, it is suggested to be considered as an area for further oil exploration routines.

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Mapping the possible origin of anomalous saline water occurrence in Agbabu, Eastern Dahomey Basin, Nigeria: insights from geophysical and hydrochemical methods

Cited by 11 publications

References 48 publications

Tilt Angle Filter Effect on Noise Cancelation and Structural Edges Detection in Hydrocarbon Sources in a Gravitational Potential Field

Tilt Angle Filter Effect on Noise Cancelation and Structural Edges Detection in Hydrocarbon Sources in a Gravitational Potential Field

Tilt Angle Filter Effect on Noise Cancelation and Structural Edges Detection in Hydrocarbon Sources in a Gravitational Potential Field

Boundaries Determination in Potential Field Anomaly Utilizing Analytical Signal Filtering and its Vertical Derivative in Qeshm Island SE Iran

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