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基于全波形反演速度约束的叠后地震反演方法

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对于井数较少或者沉积相变化较快的地层,利用测井曲线建立的反演低频模型难以控制反演弹性参数的空间变化趋势.据此笔者发展了基于FWI速度约束的叠后地震反演方法,该方法充分利用了FWI速度的真三维信息,据此得到反演弹性参数的空间变化趋势.对于叠后地震反演所需要的纵波阻抗低频模型,提出了基于测井岩石物理拟合关系将FWI速度转换为FWI纵波阻抗的方法.另外,针对FWI纵波阻抗和测井纵波阻抗存在一定差异的问题,提出了FWI纵波阻抗均值校正方法,据此可得到较为准确的纵波阻抗低频模型.单井和实际工区应用表明,纵波阻抗反演结果和井上结果匹配性较高,因此笔者提出的基于FWI速度约束的叠后地震反演方法较为有效,可为储层预测提供较为有利的技术支持.
Post-stack seismic inversion method based on FWI velocity constraint
For the formation with few wells or rapid changes in sedimentary facies,it is difficult to control the spatial change trend of inversion elastic parameters by using the inversion low-frequency model established by logging curves.Based on this,this paper develops a post-stack seismic inversion method based on FWI velocity constraint,which fully uses the accurate three-dimensional information of FWI velocity.It obtains the spatial variation trend of inversion elastic parameters.For the low-frequency model of P-wave impedance required for post-stack seismic inversion,a method of converting FWI velocity to FWI P-wave impedance based on the well-logging petrophysical fitting relationship is proposed.In addition,given the differ-ence between FWI P-wave impedance and logging P-wave impedance,a correction method of FWI P-wave impedance mean val-ue is proposed,from which a more accurate low-frequency model of P-wave impedance can be obtained.The application of a single well and actual work area shows that the P-wave impedance inversion results match well with the results on the well.Therefore,the post-stack seismic inversion method based on the FWI velocity constraint proposed in this paper is more effec-tive and can provide more favorable technical support for reservoir prediction.

low-frequency modelFWI velocitymean value correctionpetrophysicalP-wave impedanceseismic inversion

曹树春

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中国海洋石油国际有限公司,北京 100028

低频模型 FWI速度 均值校正 岩石物理 纵波阻抗 地震反演

国家"十三五"重大专项国家"十三五"重大专项中海油"十四五"重大科技项目中海油"十四五"重大科技项目中海油"十四五"重大科技项目

2017ZX05032-0032017ZX05032-04-01KJGG2022-0903KJGG2022-0904KJGG2022-0905

2024

10.3969/j.issn.1001-1749.2024.05.01

物探化探计算技术
成都理工大学 中国地质科学院物化探研究所

物探化探计算技术

CSTPCD
影响因子：0.398
ISSN：1001-1749
年,卷(期)：2024.46(5)