基于水平井信息的辫状河岩相单元与砂体定量研究——以委内瑞拉奥里诺科重油带MPE3区块为例

doi:10.11743/ogg20180219

Abstract

Abstract: When quantifying sandbody with vertical well data,the volume of sandbody often cannot be defined accurately due to the uncertainty of the interwell correlation.Horizontal well data are of significant referential value for lateral prediction of reservoir sandbody,which is difficult to be achieved by conventional vertical well data.Horizontal wells can reveal lateral variation of sandbodies,so as to assist us in quantitative characterization of sandbodies and quantitative classification of lithofacies units.This study is composed of 4 steps.Firstly,it indentified 4 types of lithofacies units according to the braided-river characteristics in the study area,coring data in vertical wells and well logging data in vertical and horizontal wells,with a view to classify lithofacies units in vertical and horizontal wells.Secondly,a quantitative research on the sandbodies was carried out with horizontal and vertical well data,and thus confirmed the configuration and scale of channel bars and braided channel sandbodies.Besides,the length-width ratio of channel bars,the width ratio of channel bar to channel and that of interbed to channel bar were well established.Subsequently,the seismic wave impedance inversion on braided-river reservoirs was carried out under the constraint of information from sandbodies encountered by horizontal well.Finally,prediction of lithofacies units was done based on the quantitative characterization of sandbodies and the results of wave impedance inversion.Results show that:(1) the horizontal well data can be used to finely characterize lithofacies distribution within reservoirs and improve the accuracy of sandbody quantification and description of internal reservoir heterogeneity;(2) the information from the laterals can increase the number of sample points in seismic inversion,thereby lower the uncertainty of interwell reservoir prediction,greatly improve the accuracy and reliability of internal reservoir seismic inversion,and increase the reliability of the reservoir lithofacies model.

Key words: braided channel and channel bar, lithofacies unit, reservoir lithofacies model, sandbody quantification, horizontal well

CLC Number:

TE122.2

Huang Wensong, Chen Heping, Li Shengli, Wan Guangfeng, Xu Fang, Meng Zheng, Liu Chang. Quantification of braided-river lithofacies units and sandbody based on horizontal well data:A case of MPE3 block in Orinoco heavy-oil zone,Venezuela[J]. Oil & Gas Geology, 2018, 39(2): 409-418.

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Quantification of braided-river lithofacies units and sandbody based on horizontal well data:A case of MPE3 block in Orinoco heavy-oil zone,Venezuela

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