Gravity tectonics controls on reservoir-scale sandbodies:Insights from 3D seismic geomorphology of the canyons buried in the upper slope of the Eastern Niger delta basin  

作　　者：Vivian O.Oguadinma Jean-Yves Reynaud Vincent Delhaye-Prat Tony Akpi Scott Thackrey Ademola Lanisa Massimo Dall’Asta 

机构地区：[1]Univ.Lille,CNRS,Univ.Littoral Côte d'Opale,UMR 8187,LOG,Laboratoire d'Océanologie et de Géosciences,F 59000 Lille,France [2]Total Energies E&P,Africa-HUB CSTJF,Avenue Larribau,64000,Pau,France

出　　处：《Energy Geoscience》2024年第3期244-260,共17页能源地球科学（英文）

基　　金：supported by the Petroleum Technology Develop-ment Fund,Nigeria,TotalEnergies Exploration and Production department,France,and the Society of Exploration Geophysicists。

摘　　要：High-resolution 3D seismic data analysis was integrated with a calibrated well and biostratigraphy data to present the first overview of a buried Pleistocene canyon system on the upper slope of the eastern Niger Delta,the Galabor Canyon.Attribute maps of specific horizons allow documenting the changing morphologies and infill lithologies of two main branches of the canyon through two stages of activity separated by a reference horizon dated at 0.99 Ma based on well calibration.At the upper slope,growth faults dissect the canyon heads,the catchment of which encroaches a network of valleys incised on the outer shelf.The canyon fill is composed of muddy channels and mass-transport deposits,largely derived from the collapse of canyon walls and sand-rich bodies forming a tract sourced by shelf-edge deltas at the outlet of the incised valleys.High-density turbiditic processes likely control the distribution of sand bodies along the canyon,ranging from tributary fans on the upper slope to 6 km-wide meander belts on the middle slope.The sandy deposits accumulate in minibasins formed along the canyon path,downstream of the subsiding hanging wall of the growth faults and upstream of shale ridges that damp the flow in the canyon.These results show that canyons can be major targets for sand reservoir exploration on the upper slope of large muddy deltas.

关 键 词：GEOMORPHOLOGY Submarine canyon 3D seismic Fault Shale ridge RESERVOIR Channel 

分 类 号：P618.13[天文地球—矿床学] P631.4[天文地球—地质学]