双相各向异性介质中波场速度与衰减特征分析  

Analysis on velocity and attenuation feature of wavefield in biphase anisotropic medium

作　　者：李红星[1,2,3] 陶春辉[2,3] 周建平[2,3] 刘财[4] 邓显明[2,3] 邓居智[1] 方根显[1] 

机构地区：[1]东华理工大学核工程技术学院,江西抚州344000 [2]国家海洋局海底科学重点实验室,浙江杭州310012 [3]国家海洋局第二海洋研究所,浙江杭州310012 [4]吉林大学地球探测科学与技术学院,吉林长春130026

出　　处：《石油地球物理勘探》2009年第4期457-465,共9页Oil Geophysical Prospecting

基　　金：地下信息探测技术与仪器教育部重点实验室(中国地质大学;北京)开放课题项目(编号:GDL0802);国家自然科学基金项目(40776038;49906004);国家油气专项(SQ22004207205);海洋公益性行业科研专项经费项目(200805005);国际海底区域研究开发"十一五"项目(DY115-02-1-01);国家海洋局青年基金项目(2007311);国家海洋局第二海洋研究所基本科研业务费专项(JT0802;J60703)资助

摘　　要：基于BISQ模型,分别推导出二维平面内双相各向异性介质中拟快纵波(qP1)、拟慢纵波(qP2)、拟SV波(qSV)和拟SH波(qSH)的波数方程。通过计算机数值计算得到四种类型波的相速度与逆品质因子,在极坐标系中观察地震波速度和衰减随波传播方向的变化规律,发现四种波的各向异性特征表现不同,且衰减各向异性特征表现得比相速度更为强烈。文中分析了孔隙度、黏滞系数、渗透率和喷射流长度等参数在垂直方向以及全传播方位角范围对四种类型波的相速度和衰减的影响,发现这种影响也存在各向异性特征,还分析了不同参数条件下波场特征随频率变化的特性,得出一系列有意义的结论。Based on BISQ model,the paper deduced the wave number equation of pseudo-fast P-wave (qP1),pseudo-slow P-wave (qP2),pseudo-SV-wave (qSV) and pseudo-SH-wave respectively in biphase anisotropic medium in 2-D plane. It is discovered by phase velocity and inverse quality factor of 4 kinds of wave computed by numeric simulation of computer and changing rule of seismic wave velocity and attenuation along with propagation direction in polar coordinate that there is different performance of anisotropic feature in 4 kinds of wave and the anisotropic feature of attenuation showing stronger than that of phase velocity. The paper analyzed the influence of different parameters such as porosity,viscosity coefficient,permeability and jet stream length on phase velocity and attenuation of 4 kinds of wave in vertical direction and full-propagating azimuth region,which discovered that the influence also has anisotropic feature. Meanwhile,the paper also analyzed the characters that the wavefield changes with frequency in different parameter conditions and gained a series of meaningful conclusions.

关 键 词：双相各向异性 地震波场 相速度 衰减 BISQ模型 黏滞系数 喷射流长度 

分 类 号：P631.4[天文地球—地质矿产勘探] TU753.8[天文地球—地质学]