Varying velocity structural mapping is one of the techniques for solving the low-amplitude structural problem and fulfilling trapping. The calculation precision of the velocity field and the method for depth transform seem to be two key links in varying velocity structural mapping. The adoption of the horizontal anti-shifting technique can make the result of the time shift after stack serve only as a bridge in favor of the interpretation and tracking of the reflection horizon and thus avoid the shift and deviation caused by time shift algorithm itself and the influence of shift error caused by the inaccurate shifting velocity upon the construction of the velocity field and the precision of the structural mapping. The inversion of the stacking velocity is used to work out the interval velocity of each layer step by step, and the 3-D spatial ray tracking figure shifting technique is adopted to make spatial shifting and homing of the nil shifting distance time domain T 0 into the depth domain to form the depth structural map.

地震属性分析技术在储层横向预测中发挥着越来越重要的作用.利用多元地震属性分析技术进行储层信息预测的理论基础是,储层中岩石性质、流体性质的空间变化可引起地震反射波形、振幅、频率等地震属性的变化.本文主要阐述了利用地震属性的分类(聚类)分析和多元地震属性回归技术,来分析特定区域储层纵、横向变化特征;强调在区域地质概念模型的前提下,预测储层的分布范围和储层物性.应用实例表明,本文方法的预测结果与钻井资料吻合较好.

基于快速模拟退火算法进行全局优化的多道反演技术是模拟金属冷凝过程中晶体自动有序排列的理论,对准备反演的模型数据作大量的、随机的参数修改(扰动),每次修改后,比较反演结果与实际地震资料的误差,选择误差最小的一些因素指导后来的修改(扰动量),并逐步"降温",使扰动量逐步缩小范围,最终找出最佳的模型答案,即为反演结果.这种反演技术具有抗噪能力强、分辨率高、忠实地震资料等特点,可以有效的解决多解性问题,达到全局优化,是一种真正的多道、快速、真三维地震反演技术.