射线参数叠前反演技术在浊积岩储层预测中的应用  

Application of Pre-stack Ray Parameter Inversion to Turbidite Reservoir Prediction

作　　者：王钟远 Wang Zhongyuan(Research Institute of Geophysical,SINOPEC Shengli Oilfield Company,Dongying Shandong 257022)

机构地区：[1]中国石化胜利油田物探研究院,山东东营257022

出　　处：《中外能源》2022年第6期35-40,共6页Sino-Global Energy

摘　　要：射线弹性阻抗对角度域的常规弹性阻抗进行了改良,它不像常规弹性阻抗那样把入射角与透射角的比值作为一个常量,而是引入不变的地震射线参数作为常量,更符合弹性波传播的物理规律,也更能真实反映地层中的各类信息。所运用的射线参数道集不需借助速度模型,可直接从原始地震道集转换得到,使转换结果具有确定性,避免了速度建模误差带来的影响。同时,基于射线参数理论的叠前地震反演流程,通过贝叶斯理论开展稀疏脉冲反演及利用约束搜索法对储层叠前弹性参数进行求取。相比于角度域的叠前弹性参数反演,该方法的反演结果具有相对更高的纵横向分辨率及更好的客观性。将其应用于利津洼陷沙三下—沙四上浊积岩储层预测,应用效果表明该方法在预测横向变化较大的复杂储层方面具有可靠性和准确性,其预测结果 对研究区的勘探开发工作具有重要的借鉴意义。The ray elastic impedance is the improvement of the conventional elastic impedance in angle do-main.It introduces seismic ray parameters as constants instead of the ratio of the incident angle to the trans-mission angle for the normal elastic impendence.It is more consistent with the physical law of elastic wave propagation and can reflect all kinds of information in the stratum more truly.The ray parameter track set adopted in this paper can be directly converted from the original seismic track set without the aid of veloc-ity model,which makes the transformation result deterministic and avoids the influence of velocity modeling error.At the same time,based on the process of pre-stack seismic inversion of ray parameter theory,sparse pulse inversion by Bayes theory is done and pre-stack elastic parameters of reservoir may be determined through constrained search method.Compared with the pre-stack elastic parameter inversion in the angle do-main,the inversion results obtained by this method have higher resolution and better objectivity.This method is applied to the prediction of the Lower Sha3 and Upper Sha4 turbidite reservoirs in Lijin subsag.The application results show that this method has good reliability and accuracy on predicting the complex reservoirs with large lateral changes,and the prediction results have important significance for exploration and development in the research area.

关 键 词：射线参数 叠前反演 储层预测 

分 类 号：P618.13[天文地球—矿床学] P631.4[天文地球—地质学]