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Magmatic activities can either positively or negatively affect hydrocarbon generation in sedimentary basins. The effect of these activities can be positive when they prevent further migration and escape or negative when extreme pressure and high temperature force the hydrocarbon to evaporate at the time of emplacement. The aim of the study is to co...
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... study area is located between longitude 12 ° 00 ʹ and 14 ° 00 ʹ E and latitude 11 ° 00 ʹ and 13 ° 00 ʹ N ( Fig. 1 ) with an approximate area of 48,400 km 2 . Using first vertical derivatives, analytic signal, and source parameter imaging filters, this study aims to image, delineate the edges, shape, depth to top, and distribution of the magmatic intrusions within the Nigerian section of the Chad Basin. ...
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... profiles were generated to show the edges and shape of intrusive structures that were enhanced using first vertical derivative and analytic signals applied on the residual map of the study area. Profile 1 as presented in Fig. 9 was generated in N-S direction with distance of 125 km. Profile 2 as presented in Fig. 10 and Profile 3 as presented in Fig. 11 were drawn in NE-SW directions with distance of 242.3 km and 145 km respectively. These profiles were done using grid profile format in Oasis Montaj on residual data, first vertical derivative, analytic signal, and source parameter imaging ...
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... profiles were generated to show the edges and shape of intrusive structures that were enhanced using first vertical derivative and analytic signals applied on the residual map of the study area. Profile 1 as presented in Fig. 9 was generated in N-S direction with distance of 125 km. Profile 2 as presented in Fig. 10 and Profile 3 as presented in Fig. 11 were drawn in NE-SW directions with distance of 242.3 km and 145 km respectively. These profiles were done using grid profile format in Oasis Montaj on residual data, first vertical derivative, analytic signal, and source parameter imaging ...
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... clearly reveal the depth to surface and edges of the intrusive structures within the Chad Basin, three profiles were drawn across the residual data on first vertical derivative, analytic signal, and source parameter imaging. The results showed anomalies A, B, and C as presented in Figs. 9 , 10 , and 11 , respectively. Anomaly A, located in the northern part of Dikwa, revealed a magnetic anomaly characterized by intrusive with 80 nT on the residual data, while the first vertical derivative showed zero values typical for volcanic edges or boundaries [53,54] . The analytic signal indicated sharp amplitudes over the causative ...
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... study area is located between longitude 12 ° 00 ʹ and 14 ° 00 ʹ E and latitude 11 ° 00 ʹ and 13 ° 00 ʹ N ( Fig. 1 ) with an approximate area of 48,400 km 2 . Using first vertical derivatives, analytic signal, and source parameter imaging filters, this study aims to image, delineate the edges, shape, depth to top, and distribution of the magmatic intrusions within the Nigerian section of the Chad Basin. ...
Context 6
... profiles were generated to show the edges and shape of intrusive structures that were enhanced using first vertical derivative and analytic signals applied on the residual map of the study area. Profile 1 as presented in Fig. 9 was generated in N-S direction with distance of 125 km. Profile 2 as presented in Fig. 10 and Profile 3 as presented in Fig. 11 were drawn in NE-SW directions with distance of 242.3 km and 145 km respectively. These profiles were done using grid profile format in Oasis Montaj on residual data, first vertical derivative, analytic signal, and source parameter imaging ...
Context 7
... profiles were generated to show the edges and shape of intrusive structures that were enhanced using first vertical derivative and analytic signals applied on the residual map of the study area. Profile 1 as presented in Fig. 9 was generated in N-S direction with distance of 125 km. Profile 2 as presented in Fig. 10 and Profile 3 as presented in Fig. 11 were drawn in NE-SW directions with distance of 242.3 km and 145 km respectively. These profiles were done using grid profile format in Oasis Montaj on residual data, first vertical derivative, analytic signal, and source parameter imaging ...
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... clearly reveal the depth to surface and edges of the intrusive structures within the Chad Basin, three profiles were drawn across the residual data on first vertical derivative, analytic signal, and source parameter imaging. The results showed anomalies A, B, and C as presented in Figs. 9 , 10 , and 11 , respectively. Anomaly A, located in the northern part of Dikwa, revealed a magnetic anomaly characterized by intrusive with 80 nT on the residual data, while the first vertical derivative showed zero values typical for volcanic edges or boundaries [53,54] . The analytic signal indicated sharp amplitudes over the causative ...
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... These areas have anomalies trending NE-SW, which agree with the regional azimuth of the major intrusive rocks in Sothern Benue Trough (Chukwu and Obiora 2014, this suggests that their emplacement was controlled by regional events rather than restricted local activities. The anomaly was very pronounced from Ebem, Akaeze to Afikpo area, though the field strength diminished little around Inyigbede and Okposi areas, this was inferred as near-surface or exposed intrusive (sill) as observed in Afikpo and Akaeze area known to be sedimentary terrain (Figs. 1, 2, 3), which under natural conditions usually has low magnetic susceptibility (Oha et al. 2016;Arinze et al. 2019;Lawal et al. 2021;Hakim and Chokri 2017;Yusuf et al. 2022). The definition of the anomaly source as an exposure or near the surface was informed by low susceptibility documented by TMI and verified by field mapping (ground truthing) of the Content courtesy of Springer Nature, terms of use apply. ...
Airborne magnetic datasets over Southern Benue Trough were collected, filtered, enhanced, and subsequently employed to generate a model of the subsurface basement topography, interpret the structural framework in connection to geodynamic processes, lithology distributions, and estimate the depth of the magnetic basement which invariably reveal the sedimentary thickness in the study area. The data processing includes analytic signal, tilt gradient, and source parameter imaging (SPI) were applied. The residual magnetic intensity ranges from less than − 60.5 to slightly above 120 nT while the magnetic analytical signal values range from 0.002 to 0.053 nT/km. The maps indicated contrasting subsurface field magnetic intensities for which the study area was divided into three basic magnetic zones (zones characterized by high, intermediate, and low magnetic intensities respectively). The results of analytical signal analysis and tilt derivative gave the foresight of subsurface structural morphology (regional and local) and their orientations, which indicates that the area was subjugated by NE–SW trending structures with minor NW–SE, E–W, and N–S regional lineaments. These structures indicated cross-cutting relationships which designated phases of generic events. The result of the SPI shows the maximum sedimentary thickness of about 3 and 4 km around the Nkalagu and Afikpo areas respectively. Shallow sedimentary thickness was observed within the basement complex areas around Ugep, Uban Hills, Obokpa, Okokori, as well as the central and northern areas (Abakaliki, Ishiagu, and Afikpo) with outcropping intrusive/volcanic rocks. Afikpo area has a sediment thickness of above 3 km which can be highlighted and recommended for hydrocarbon evaluation while considering other major petroleum play factors, not forgetting the influence of activities that brought the emplacement of the intrusive found within the basin. The structural concept defined here holds lots of promise for favorable mapping of base metal deposits and their structural control.
