相控技术在低勘探区生屑滩相储层预测中的应用

摘要

The bioclastic shoal reservoir has strong heterogeneity,and it is difficult to accurately predict the reservoirs and physical properties by conventional geophysical prospecting methods.A set of integrated techniques of seismic microfacies analysis,facies-controlled reservoir inversion,facies-controlled porosity prediction was formed,to predict bioclastic shoal reservoirs and their properties.The results show that facies analysis techniques of plane sedimentary facies interpretation and profile seismic facies monitoring based on the waveform clustering can be used to realize seismic microfacies analysis.Under the control of sedimentary microfacies,the low frequency model was established by filling the average velocity of lithology in each facies,and then combined with the color inversion technology,the impedance inversion could be completed.This is an effective inversion method in the less well zones.According to the results of statistical rock physical analysis,the impedance could be transformed to porosity under the control of sedimentary structure and microfacies,and then the bioclastic shoal reservoir property prediction could be realized in the less well zones.Practical application has proved that this method is effective for the prediction of bioclastic shoal reservoirs.%针对生屑滩相储层非均质性强、常规物探技术及方法难以准确预测其储层和物性这一难题,研究形成了一套集“平剖融合”地震微相分析、相控储层反演、相控孔隙度预测等于一体的生屑滩相储层及物性预测方法流程和关键技术.结果表明:以波形聚类为基础的平面沉积相解释、剖面地震相监控的相分析技术,可以实现“平剖融合”的地震微相分析;相控岩性平均速度充填建模和有色反演的有机结合,可以实现低勘探区(少井或无井地区)生屑滩相储层预测;沉积结构和沉积微相控制下的速度-孔隙度转换,可以有效解决低勘探区生屑滩相储层物性预测难题.实例表明,该方法流程和关键技术对于生屑滩相储层物性预测行之有效.