【摘要】 研究区位于非洲,储层具有砂地比低、砂层薄、物性较差的特点,沉积相带变化快,砂层连续性较差.同时区内火成岩发育,穿时现象严重,淹没砂泥岩特征等等难点.本文通过井的波阻抗特征分析,利用波阻抗特征在原始地震体中剔除火成岩,在砂泥岩体上以小时窗对砂泥岩的波阻抗特征来区分砂泥岩.同时,在纵向上,由于压实作用的影响,各层波阻抗值变化较快,无法在大时窗内进行整体反演,为了更好的在横向和纵向上对储层进行预测,应用"小时窗火成岩镂空法"对工区内薄储层进行预测.认为:在R区的以河道沉积体系为主,P区的扇三角洲沉积体系准确进行了储层预测.其反演方法的设计理念是一种结合地质、地震、测井的的综合储层预测与检验方法.后续的钻探结果表明:此种方法对优质储层的预测符合率达到75%以上.随着地质条件的变化,单一的地质或地球物理方法肯定不能完全满足实际需求,这种多学科结合的预测方法必然是未来发展的方向.更多还原

【Abstract】 The studied area is located in African.The main target reservoir is characterized by low sand/shale ratio, thin sand bed and poor properties.The sedimentary facies vary fast laterally and reservoir has a poor continuity. Furthermore,the igneous body is widely developed in the studied area,which intruded into different strata and disguised the characteristics of sand and shale in seismic data.In this paper,the igneous body was hollowed out from the original 3D seismic data based on P-wave impedance derived from logging analysis.After that,sand was separated from shale in the rest of the seismic data based on the P-wave impedance difference between sand and shale by means of short time-window inversion.The P-wave impedance of different strata vary fast vertically due to compaction, therefore,the method of "Short Time-window Inversion after Igneous Body Hollow-out" are used to predict the lateral and vertical distribution of the thin bed reservoir in the studied area.Reservoir inversion was applied to accurately predict the channel system in Area R and the fan-delta system in Area P.Following drilling results show that the accuracy rate of high-quality reservoir prediction reached up to 75%.This inversion technology is a comprehensive method to predict reservoir using geological,seismic and logging data,which will be a new trend in the area of reservoir prediction.更多还原