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Analysis of high-resolution airborne-magnetic data for hydrocarbon generation and preservation potential evaluation of Yola sub-basins,northern Benue Trough,northeastern Nigeria

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Energy Geoscience 2023年第1期4卷 33-41页

作者： Olawale Olakunle Osinowo Yusuf Abdulmumin Tumilara Victor Faweya Department of Geology University of IbadanIbadanNigeria Department of Geology Abubakar Tafawa Balewa UniversityBauchiNigeria Department of Geology University of IbadanNigeria

High-resolution airborne-magnetic data acquired over the Yola extension of the northern Benue Trough,northeastern Nigeria,were analyzed to delineate rock distribution,define basement geometry,determine sedimentary thicknesses,and highlight structural framework among others for the hydrocarbon prospect evaluation of sub-basins in the *** and refined magnetic intensity data were subjected to Analytic Signal,Horizontal and Vertical Tilt Derivatives and Euler deconvolution depth weighting analyses to enhance various geological features requisite for petroleum prospect *** rock units flanked the northeast and south widely occur in the central part with volcanic rock intrusions delineated within the sedimentary *** lineaments(less than 5 km and up to 45 km)were observed to dominantly follow the established Benue Trough and Yola sub-basin evolutionary trend along the NEeSW and ESEeWNW directions,*** prominent subbasins with sedimentary thicknesses in excess of 3 km and width of more than 60 km,separated by basement highs of mostly volcanic intrusions origin,were *** occurrence of relatively thick and extensive sub-basins which are underlain by structurally active basement rocks suggests relatively high geothermal gradient for generation of hydrocarbon from organic matter rich source rocks while the generated oil and gas are preserved within intra-sedimentary structural traps created when the basement fractures were reactivated.

关键词： Tilt derivatives:analytic signal volcanic intrusions Structurally active basement Sedimentary thickness

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2.5-D Earth Crust Density Structure Modeling of the Central Part of Cameroon Using Gravity Data

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Open Journal of Earthquake Research 2020年第3期9卷 289-306页

作者： Francoise Martine Enyegue a Nyam Albert Eyike Yomba Alain Rodrigue Nzeuga Alix Stanislas Soh Department of Physics Faculty of ScienceUniversity of Yaounde IYaoundeCameroon Faculty of Science University of Douala Head of the Watch Technologic Unit Ministry of Scientific Research and InnovationYaoundeCameroon

The knowledge of areas of high and low geophysical densities is of paramount importance to better understand the geodynamic, tectonic and geomorphologic evolution of the earth. Several geophysical methods have been developed to achieve this, including a 2.5 D modeling from gravity data, which is the approach used in this work and whose aim is to highlight the causative geological structures of these contrasts in the central part of Cameroon. This zone extends between latitudes 3° and 7° North and longitudes 11° and 16° East. Several filters were applied to the gravimetric and topographic data using the Oasis Montaj software from geosoft in order to develop the different anomaly maps and Grav2dc in order to develop the different geological models of the subsoil. In the final analysis, it appears that this part of Cameroon suggests the presence of granitic rocks and sedimentary rocks whose density contrasts vary between -0.19 and -0.205 g/cm3 observed in the localities of Banyo, Ngaoundere and Abong-Mbang. We also observe the presence of gneiss and volcanic rocks of contrast density varying between 0.0522 to 0.0534 g/cm3 in the locality of Tibati, and granitic intrusions in addition to basic rocks of contrast density varying between 0.285 at 0.29 g/cm3 in the localities of Yoko, Bertoua and Belabo.

关键词： Gravity Anomaly Modeling volcanic intrusions

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