【摘要】 利用地震资料直接找油气的基础是通过精细岩石物理分析和精确正演模拟揭示储集层岩性、物性和流体与地震反射特征的关系。对车排子地区沙湾组储集层岩石物理参数的统计表明,该区油层、水层和干层之间物性参数存在一定差异,应用实际测井资料进行精细地震正演、流体替换和AVO模拟发现,沙湾组砂岩在含油饱和度大于70%时,表现为强振幅和振幅随炮检距增大而增大的AVO特征,含油饱和度小于40%时,则相反;含油饱和度为40%~70%时,其振幅随炮检距变化而基本不变。应用建立的虚拟测井曲线进行地震正演模拟,结合叠前、叠后地震属性分析,对钻探目标进行评价,实现了砂体含油性预测,预测结果与实钻吻合。图6参11更多还原

【Abstract】 The fundamentals of finding hydrocarbons with seismic data is to reveal the relations of lithology,petrophysical property,fluid and the seismic reflection features by petrophysical analysis and exact forward modeling.Statistics of petrophysical parameters of the Shawan reservoirs in the Chepaizi region indicates differences of petrophysical parameters between oil layer,water layer and dry layer.The seismic forward modeling,fluid substitution and AVO modeling with actual log data showed that when the Shawan sand oil saturation is more than 70%,high reflection amplitude and the AVO feature of amplitude increasing with offset are reflected;when oil saturation less than 40%,the results are contrary;when oil saturation being 40%-70%,the amplitude is stable with the change of offset.According to these conditions,the drilling targets were appraised with forward modeling of pseudo logging set combining with prestack and poststack seismic attributes analysis.The oil-bearing performance of sand body was predicted and the prediction was consistent with the actual drilling results.更多还原