基于GSLS模型TI介质衰减拟声波方程

发布时间：2018-03-21 14:58

本文选题：各向异性介质　切入点：声学近似　出处：《地球物理学报》2016年06期 　论文类型：期刊论文

【摘要】：随着计算机硬件技术的发展以及高分辨率勘探需求的增加,我们希望能够更准确地模拟地下介质,得到更丰富的地层信息.然而,传统的声学假设并不能描述实际地层所存在各向异性和黏滞性,使得成像分辨率较低.为了实现深部储层的高精度成像,本文同时考虑了介质的各向异性和黏滞性,从TI介质弹性波的基本理论出发,结合各向异性GSLS理论,并通过声学近似方法导出基于GSLS模型的各向异性衰减拟声波方程.数值模拟表明该方程既能准确地描述各向异性介质下的准P波运动学规律,又能体现地层的吸收衰减效应;模型逆时偏移结果表明,在实现成像过程中考虑各向异性和黏滞性的影响,能对高陡构造清晰成像,且剖面振幅相对均衡,分辨率较高.
[Abstract]:With the development of computer hardware technology and the increasing demand for high-resolution exploration, we hope to be able to simulate underground media more accurately and obtain more abundant formation information. The traditional acoustic hypothesis can not describe the anisotropy and viscosity of the real formation, which makes the imaging resolution lower. In order to realize the high accuracy imaging of deep reservoir, the anisotropy and viscosity of the medium are considered in this paper. Based on the basic theory of elastic wave in TI medium and anisotropic GSLS theory, The anisotropic attenuation pseudo acoustic wave equation based on GSLS model is derived by acoustic approximation method. The numerical simulation shows that the equation can not only accurately describe the kinematics of quasi P wave in anisotropic media, but also reflect the absorption attenuation effect of strata. The results of inverse time migration show that considering the influence of anisotropy and viscosity in the imaging process, the model can clearly image the high and steep structure, and the amplitude of the section is relatively equal and the resolution is high.
【作者单位】：中国石油大学(华东)地球科学与技术学院;
【基金】：国家科技重大专项课题(2011ZX05006-002) 国家重点基础研究发展计划(973计划)项目(2011CB202402)资助
【分类号】：P631.4

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