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Use of the Polynomial Separation and the Gravity Spectral Analysis to Estimate the Depth of the Northern logone Birni Sedimentary Basin (CAMEROON)

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International Journal of Geosciences 2017年第12期8卷 1442-1456页

作者： Jean Jacques Nguimbous-Kouoh Simon Ngos III Theophile Ndougsa Mbarga Eliezer Manguelle-Dicoum Department of gas and petroleum exploration Institute of Mines and Petroleum Industries University of Maroua Maroua Cameroon Department of Physics Advanced Teacher’s Training College University of Yaoundé 1 Yaoundé Cameroon Department of Physics Faculty of Science University of Yaoundé I Yaoundé Cameroon

Many scientists used the power spectrum of the gravity anomaly to obtain the average depth of the disturbing surface or equivalently the average depth to the top of the disturbing body. The spectrum of gravity anomaly due to layered source is separated into multiple segments in frequency domain that can be interpreted in terms of mean depth of the interface. The half of the slope of the segments gives the mean depth of the interfaces. This study aims to estimate the average residual depth anomalies of various regions of the northern logone Birni sedimentary basin of Cameroon using polynomial separation of gravity anomalies, and spectral analysis along different profiles (segments). The profiles were derived from residual anomaly maps obtained by fitting the Bouguer anomalies, the interpretation used polynomial separation and depth average was done using spectral analysis. Positive and negative residual gravity anomalies were highlighted and their interpretation revealed the structural directions of the sedimentary basin (NW-SE and NE-SW), as well as an intimate relationship between the negative anomalies and the northern logone Birni sedimentary basin. Three distinct residual anomalies were identified over the Goulfey, Tom Merifine and Tourba basin with an average depth varying between 0.24 km and 4.55 km.

关键词： Gravity Anomalies Qualitative Interpretation Spectral Analysis logone Birni

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Depositional and Structural Styles in the logone Birni Basin (LBB), Northern Cameroon, from 3D Potential Field Modeling: Preliminary Results

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Open Journal of Geology 2019年第4期9卷 226-244页

作者： Elad Mkoumbe Fosso Téguia M. Estelle Eric Eyike Yomba Albert Njandjock Nouck Philippe Tabod Charles Tabod Department of Physics Faculty of Science University of Douala Douala Cameroon Branch for Geophysical and Volcanological Research/Institute of Geological and Mining Research Buea Cameroon Department of Physics Faculty of Science University of Yaoundé I Yaoundé Cameroon

A three-dimensional model of the logone Birni Basin (LBB) is presented by combining gravity and magnetic data and constrained by broad seismic profiles. The 3-D model has revealed the distribution of the stratigraphic formations as well as the top basement variation. Detailed structure of different stratigraphic sequences is presented for the first time for this basin and some of the sequences correlate with established sequences of the neighboring basins. The sediments pill consists of six sedimentary units dating from the Neocomian to the Quartenary. The Makary subbasin or Northern logone Birni Basin (NLBB) is the deepest part of the basin and may hold good prospect for hydrocarbon generation and accumulation. However, the limited presence of faults and intrusive bodies decreases the possibility of thermal degeneration, contrary to the Central logone Birni Basin (CLBB) where conditions seem to be fulfilled for possible hydrocarbon generation and maturity. The complexity of the structural pattern of the model is further enhanced by the presences of volcanic bodies, some of which lay directly on basement or interbedded with the sediments layers mainly in the CLBB.

关键词： Gravity/Magnetic Anomalies Stratigraphic Sequences Sediment Thickness logone Birini Basin 3D-Model

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