3DTTI介质逆时偏移计算关键问题研究

发布时间：2018-11-27 08:21

【摘要】：TTI介质逆时偏移是复杂构造区地震成像的一种重要有效技术.然而,其3D数据实际应用仍然存在一些挑战.本文以TTI拟声波方程为基础,系统梳理了TTI逆时偏移计算中的几个关键问题并给出解决方案.首先,P波与SV波耦合问题.本文系统分析了各向异性参数匹配方法伪横波压制效果以及其对波传播的影响;其次,为了提高计算效率,本文基于CUDA平台实现GPU加速计算方案.主要解决了两个方面的问题,其一为扩展了随机边界在TTI介质波场传播中的应用,确定了TTI介质速度和其他四个参数对应的"均匀各向异性"随机边界;其二,本文将单GPU拓展到多GPU实现三维TTI介质逆时偏移,并且采用了一种异步流技术,大大提高了GPU计算的高并发策略,使双GPU实现的加速比与单GPU相比接近理想的2∶1.最后通过3D模型试验证明了方法的效率和准确性.
[Abstract]:Inverse time migration of TTI medium is an important and effective technique for seismic imaging in complex structural areas. However, there are still some challenges in the application of 3D data. Based on the TTI pseudo acoustic equation, this paper systematically combs several key problems in the calculation of TTI inverse time migration and gives the solution. First, P wave and SV wave are coupled. In this paper, the effect of pseudo-S-wave suppression and its influence on wave propagation are systematically analyzed. Secondly, in order to improve the computational efficiency, this paper implements an accelerated GPU computing scheme based on CUDA platform. Two main problems are solved. One is to extend the application of random boundary in the propagation of TTI medium wave field, and to determine the "homogeneous anisotropic" random boundary corresponding to the velocity of TTI medium and the other four parameters. Secondly, this paper extends single GPU to multiple GPU to realize inverse time migration of 3D TTI medium, and adopts an asynchronous flow technique, which greatly improves the high concurrency strategy of GPU computation, and makes the speedup ratio of double GPU close to the ideal 2: 1 ratio compared with single GPU. Finally, the efficiency and accuracy of the method are proved by 3D model test.
【作者单位】：中国地质大学(北京);中国地质科学院矿产资源研究所;
【基金】：国家自然科学基金项目(41530321) 国家高技术研究发展计划(863计划)项目课题(2012AA061202) 中央高校基本科研业务费项目联合资助
【分类号】：P631.4

【相似文献】