Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Acta Geophysica

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Qualitative and quantitative analysis of gravity data: structural implications in Douala-Kribi basin, Cameroon

Yandjimain J., Ngoumou P. Claude, Mbarga T. Ndougsa

Acta Geophysica

2024

Vol. 72, no. 1

49--65

The aim of this study is to improve the structural map of Douala-Kribi basin. For this purpose, computer tools are used to make qualitative and quantitative analyses to interpret the gravity data. The findings provided several maps which are: the Bouguer gravity anomalies, residual, horizontal gradient, analytical signal, tilt angle, variation of depth, and multi-scale analysis gravity anomalies maps. A thorough examination of these maps highlights lineaments interpreted as faults, and intrusive bodies in the study area. The multi-scale analysis helped to portray the deep faults and therefore construct the structural map of the Douala-Kribi basin. The application of the Euler deconvolution method and variation of the maxima solutions of horizontal gradient upward continuation (HGup) have resulted in the depth of the structures and the intrusive bodies. The faults identified in the Douala-Kribi basin seem to be induced by tectonic movements in addition to the uprise of intrusion. The Euler solutions and tilt angle depths are included in those of the residual field while those from the analytical signal partly overlap those from the residual field and tilt angle. Then, the Euler solutions maps, and the maxima solutions contribute to highlighting the trust interval depth which is the compatibility depth.

Structural features derived from a multi-method approach and 2.75D modelling of aeromagnetic data: a case study of the Pitoa–Figuil area (Northern Cameroon)

Kassia G. Voltaire Souga, Mbarga T. Ndougsa, Meying A., Ngoh J. Daniel, Embeng S. Ngoa

Acta Geophysica

2023

Vol. 71, no. 2

587--600

An interpretation of aeromagnetic data was conducted in the Pitoa–Figuil area (Northern Cameroon). The aim of this investigation was the first to emphasise lineaments hidden under geological formations and secondly to propose two 2.75D models of the subsurface structures. Different magnetic data processing techniques were used, notably horizontal gradient magnitude, analytic signal and Euler deconvolution. The application of these techniques made it possible to map a certain number of lineaments representing discontinuities of magnetic susceptibility, mainly oriented NE–SW, NW–SE, E–W and ENE–WSW. The predominant direction for major lineaments is NE–SW and NW–SE. The major NE–SW trends have been attributed to the consequences of the Benue trough set-up due to the Atlantic opening. The lineaments map associated with the Euler solutions permits us to highlight and characterise 18 faults and some intrusive bodies. Euler solutions indicate depths down to 5.3 km for anomaly sources. The 2.75D modelling from the aeromagnetic anomaly reduced to the equator permits to understand the stratification of the deep and near-surface structures, which are sources of the observed anomalies. The sediment thickness values (3.5–4 km) combined with the presence of numerous deep faults make this area a potential site for hydrocarbon accumulations.