宽方位地震资料方位各向异性处理——以大庆长垣三分量地震数据为例

doi:10.13810/j.cnki.issn.1000-7210.2020.02.008

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摘要地震纵波在HTI介质中传播时，沿垂直于裂缝方向的速度小于沿平行于裂缝方向，且反射强度降低和频率变低；横波在HTI介质中传播时分裂成快、慢横波。以大庆长垣喇嘛甸地区的宽方位三分量地震资料为基础，分析了方位各向异性的表现特征、影响及不同方位角范围内属性的变化，并根据这些性质的变化利用椭圆拟合对该地区的各向异性的方位和强度进行定量预测，与利用横波分裂预测的结果一致。为了消除方位各向异性对地震成像分辨率的影响，利用椭圆拟合准确求出了HTI介质的方位速度，进行方位速度动校正，消除了方位各向异性引起的快慢波时差，提高了资料的成像质量。

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	张丽艳
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	陈志德

关键词 ：宽方位, 各向异性方向, 各向异性强度, 快慢波时差, 方位速度, 椭圆拟合

Abstract：For HTI media,P-waves run slower in the direction perpendicular to fractures than in the direction parallel to fractures; meanwhile,reflection strength and frequency decrease with propagation.S-waves split into fast and slow waves.Bosed on the wide-azimuth three-component data in Lama-dian,Daqing Placanticline,we analyzed the perfor-mance characteristics,influence of azimuthal aniso-tropy,and attribute variation with azimuth.Ellipse fitting is then utilized to quantitatively predict the azimuth and intensity of anisotropy in this area.Our results are consistent with those obtained using shear wave splitting.To mitigate the influence of azimuthal anisotropy on the resolution of imaging,we calculate the accurate azimuthal velocity of HTI media through ellipse fitting to accomplish NMO correction.This corrects the time difference between fast and slow waves caused by azimuthal anisotropy and consequently improves seismic imaging.

Key words： wide azimuth anisotropy azimuth anisotropy intensity time difference between fast and slow waves azimuthal velocity ellipse fitting

收稿日期: 2019-05-10

PACS:

P631

基金资助:本项研究受国家自然科学青年基金项目“油气勘探中宽方位OVT处理方法及其应用研究”（41804138）和中国地质调查局项目“松辽盆地北部页岩油战略调查与评价”（DD20190114）联合资助。

通讯作者: 张丽艳,辽宁省沈阳市黄河北大街280号中国地质调查局沈阳地质调查中心,163712。Email:moonliyan@sohu.com E-mail: moonliyan@sohu.com

作者简介: 张丽艳,高级工程师,1981年生;2003年毕业于中国石油大学(华东),获勘查技术与工程专业学士学位;2008年毕业于中国石油大学(北京),获地球探测与信息技术专业工学博士学位。现在中国地质调查局沈阳地质调查中心主要从事页岩油地震勘探、"两宽一高"高分辨率地震资料处理及三分量地震成像等方面的研究。

引用本文:

张丽艳, 李昂, 刘建颖, 杨建国, 陈志德. 宽方位地震资料方位各向异性处理——以大庆长垣三分量地震数据为例[J]. 石油地球物理勘探, 2020, 55(2): 292-301,310. ZHANG Liyan, LI Ang, LIU Jianying, YANG Jianguo, CHEN Zhide. Azimuth anisotropic wide-azimuth seismic data processing: A case study of three-component data from Daqing Placanticline. Oil Geophysical Prospecting, 2020, 55(2): 292-301,310.

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http://www.ogp-cn.com/CN/10.13810/j.cnki.issn.1000-7210.2020.02.008 或 http://www.ogp-cn.com/CN/Y2020/V55/I2/292

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