Architecture Model and Sedimentary Evolution of Deepwater Turbidity Channel:A Case Study of M Oilfield in West Africa
Zhang Wenbiao
Duan Taizhong
Liu Zhiqiang
Liu Yanfeng
Yang Zhicheng
Xu Rui
Abstract：As an important reservoir type in deepwater environment,turbidite channel and studies on its architecture are important t for efficient development of an oil field.In order to clearly understand the reservoir architecture of M oilfield,a semiquantitative to quantitative study on turbidite channel depositional architecture patterns was conducted by analyses of seismic stratigraphy,seismic sedimentology and sedimentary petrography of the middle to lower slope at M oilfield,West Africa,and the sedimentary evolution was analyzed on the basis of core,outcrop,logging and seismic data.Results show that in the study area,stages 3 to 5 are single channel,complex channel,and channel system respectively.Single channel sinuosity is negatively correlated with slope,and internal grain size becomes increasingly fine and thickness decreases from bottom to top and from the axis to the edge.The migration type of a single channel within one complex charnel can be divided into lateral migration and along paleocurrent migration horizontally,and lateral stack,echelon stack,and swing stack in section view.O73 channel system comprises of a semi-confining type and a non-confining type.Horizontally,there is semi-confining channel system close to the source while non-confining one far away from it.In terms of vertical evolution,it is most typically displayed within nonconfining charnel system,which shows decreasing undercutting and more lateral accretion,larger sinuosity and smaller channel sand body from the bottom up.Comprehensive analyses indicate that controlling factors of M oilfield turbidite sedimentary model and its evolution are paleotography slope and source supply.
Keywords：reservoir architectureturbidity channelsedimentation modeldeepwater explorationpetroleum geology
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 273-285 )