射线参数域叠前弹性参数反演在储层预测中的应用

发布时间：2018-03-27 12:37

本文选题：P道集射线路径　切入点：角度道集射线　出处：《天然气地球科学》2016年08期

【摘要】：P道集的地震波是按照射线路径传播的,与角度道集相比,更接近地震波的实际传播路径,更能表征地下的反射特征。同时P道集可直接从地震数据计算得到,不依赖于上覆地层速度,避免了不精确的速度模型给反演带来的误差。文章在介绍P道集基本概念及射线参数域叠前弹性参数反演流程的基础上,利用分P叠加数据,通过贝叶斯稀疏脉冲反演进行了不同P值的射线弹性阻抗反演,并通过约束搜索法求取了相关的叠前弹性参数。相比于角度域的叠前弹性参数反演,其反演结果具有高分辨率、高精度且客观真实的特点。将该方法应用于川西坳陷新马滚动区以及川北坳陷元坝西区的储层预测,实际应用效果证明了该方法的可靠性和准确性,其预测结果对研究区下一步的勘探开发工作具有重要的指导意义。
[Abstract]:The seismic wave of P gather propagates according to the ray path, which is closer to the actual propagation path of seismic wave than the angle gather, and can represent the reflection characteristics of underground, and P gather can be obtained directly from seismic data. The paper introduces the basic concept of P gather and the inversion flow of prestack elastic parameter in ray parameter domain, and makes use of the fractional P stack data, which does not depend on the overlying formation velocity and avoids the error caused by the imprecise velocity model. The ray elastic impedance inversion with different P values is carried out by Bayesian sparse pulse inversion, and the relative prestack elastic parameters are obtained by the constraint search method. Compared with the pre-stack elastic parameter inversion in angle domain, the inversion results have high resolution. The method is applied to the reservoir prediction of Xinma rolling area in west Sichuan depression and Yuanba western part of north Sichuan depression. The practical application results show that the method is reliable and accurate. The prediction results are of great significance to the further exploration and development in the study area.
【作者单位】：中国地质大学(北京)能源学院;中国石化石油勘探开发研究院;北京诺克斯达石油科技有限公司;中国石油大港油田分公司第四采油厂地质研究所;
【基金】：国家重点自然基金(编号:41530314) 中央高校基本科研业务费专项基金资助项目(编号:2652015330)联合资助
【分类号】：P618.13;P631.4

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