Abstract:

Hierarchy analysis and model fitting techniques are used to describe the point bar configuration of the meandering river deposits in the Neogene Guangtao Formation in the middle unit of Block 7 in the Gudong oilfield.According to the lithologic and electrical properties of sedimentary microfacies in the meandering river deposits and in combination with the modes of deposition,we divide the sedimentary microfacies and identify two point bars in the study area.With production performance and test data,quantitative models of point bar configuration unit are built,which includes the orientation,dip,space and horizontal width of a single lateral-accretion sandbody.Under the guidance of the models and constraints of well data,we analyze in detail the internal configuration of the point pars and build 3D models for point bar configurations of meandering river deposits.Furthermore,we analyze the remaining oil distribution and presents specific measures to tap the production potential.

Key words: point bar, lateral-accretion layer, remaining oil, reservoir configuration, Gudong oilfield, Jiyang Depression