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Aeromagnetic Interpretation of basement structures and Geometry in Parts of the Middle Benue Trough,North Central,Nigeria

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Advances in Geological and Geotechnical Engineering Research 2022年第4期4卷 22-40页

作者： Esho Oluwaseyi Olatubosun Osisanya Olajuwon Wasiu Ibitoye Taiwo Abel Ajibade Femi Zephaniah Tokunbo Sanmi Fagbemigun Department of Geology University of IbadanIbadanNigeria Department of Physics University of BeninBeninNigeria Department of Petroleum Engineering and Geosciences Petroleum Training InstituteEffurunNigeria Department of Geophysics Federal UniversityOye-EkitiNigeria

The research of an analysis of aeromagnetic data collected in the middle Benue Trough in north-central Nigeria is presented.A detailed analysis of basement structures is conducted in order to identify regions with high hydrocarbon potential that is different from those discovered by earlier *** data were filtered by using the Butterworth and Gaussian filters,transformed by engaging the reduction to the equator technique,and subsequently *** estimate magnetic basement depths at various places throughout the basin,the Euler deconvolution depth weighting approach was ***(11)sub-basins with depths ranging from-2000 m to-8000 m were also identified by Euler’s *** sub-basins trend in the NE-SW direction while the average sediment thickness is found to be more than 3 *** extracted structural features indicate areas like Kadi Blam and Kado areas in the southeastern part and Ogoja and Obudu in the southern part of the study area as regions with high structural *** areas coincide with the areas delineated as the *** cross-sections generated reveal depressions caused by the action of some tectonic activities in the *** study identified undulating basement topography believed to be due to tectonic activities as well as five areas that are possible targets for hydrocarbon exploration.

关键词： Aeromagnetic data Euler deconvolution basement structures Hydrocarbon potentials Middle Benue Trough

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Thick-skinned Contractional Salt structures in the Kuqa Depression,the Northern Tarim Basin:Constraints from Physical Experiments

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Acta Geologica Sinica(English Edition) 2008年第2期82卷 327-333页

作者： YU Yixin TANG Liangjie YANG Wenjing JIN Wenzheng PENG Gengxin LEI Ganglin State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 Basin ＆ Reservoir Research Center China University of Petroleum Beijing 102249 Research Institute of Tarim Oilfield Korla Xinjiang 840000

Thick-skinned contractional salt structures are widely developed in the western Kuqa depression, northern Tarim basin. To understand the mechanisms that govern the development of these structures, physical experiments are conducted and the results show that they are largely governed by the activities of basement faults and the forming of paleo-uplifts and basement slopes. The model materials in this study are dry sand, vaseline and plasticene （or hard foam）, simulating the suprasalt, salt, and subsalt layers respectively. The experiments show that, due to the activities of basement faults and the forming of the paleo-uplifts, salt bodies usually accumulate and thicken significantly on the middle top of the paleo-uplifts which are constrained by the pre-exiting boundary faults. The development of large-scale thrust faults and salt nappes is favored by the basement slops with larger dips. The experiments also conclude that differential structural deformation could occur between the subsalt and suprasalt layers because of the presence of salt layers. Their geometries and the locations of structural highs are different, despite of the great similarities in the uplifted areas. The pierced salt diapir is not observed in the experiments, which indicates that the contractional shortening does not effectively accelerate the development of the salt diapir.

关键词： thick-skinned contraction basement structures salt structures physical modeling Kuqa depression

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