川东北探区层析与全波形反演联合建模方法及应用

doi:10.11720/wtyht.2025.0037

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摘要

普光探区由于受多期构造运动作用,地表、地下双复杂,膏盐等特殊地质体刻画不精细,导致速度场建立不准确,严重降低了成像质量,制约了油气的精细勘探开发。为了提高速度建模精度,改善复杂构造的地震建模与成像效果,本文开展复杂山地全波形反演联合速度建模方法应用研究,形成针对普光探区的基于全波形反演的深度域速度建模流程。通过层析与全波形联合反演,并引入地质信息的约束来提升全波形反演的稳定性,使模型与地下构造更加匹配,通过实际资料测试,全波形反演技术可以显著提升复杂转换带的速度模型的细节刻画精度,对普光大湾—毛坝的复杂构造成像改善作用明显。

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	国运东

关键词 ：全波形反演, 深度域偏移, 速度建模, 普光探区

Abstract：

The Puguang exploration area in the northeastern Sichuan Basin,China,is characterized by complex surface and subsurface conditions due to the influence of multistage tectonic movements.This dual complexity poses a challenge to precisely characterizing special geobodies like anhydrites in this area,leading to inaccurate velocity field establishment.Consequently,the seismic imaging quality is severely degraded,hindering the fine-scale exploration and production of oil and gas.To enhance velocity modeling accuracy and improve seismic modeling and imaging effects for complex structures,this study investigated the application of a joint velocity modeling method integrating full waveform inversion(FWI) for complex mountainous terrain.A depth-domain velocity modeling workflow based on FWI was developed for the Puguang exploration area.The joint inversion combining tomography and FWI,enhanced by incorporating geological constraints to improve FWI stability,results in a velocity model that effectively matches the subsurface structures.The test using actual data demonstrates that FWI can significantly improve the detail characterization accuracy of velocity models for complex transition zones.This improvement is particularly evident in the enhanced imaging of complex structures in the Dawan and Maoba blocks in the Puguang exploration area.

Key words： full waveform inversion(FWI) depth migration velocity modeling Puguang exploration area

收稿日期: 2025-03-24 修回日期: 2025-07-04 出版日期: 2025-10-20

ZTFLH:

P631.4

基金资助:国家科技重大专项课题(2024ZD14001-004);中石化集团公司项目(P23142)

作者简介: 国运东(1991-),男,博士(后),副研究员,2020年毕业于中国石油大学(华东),研究方向为全波形反演。Email:gyd_upc@edu.cn

引用本文:

国运东. 川东北探区层析与全波形反演联合建模方法及应用[J]. 物探与化探, 2025, 49(5): 1090-1098.
GUO Yun-Dong. Tomography-FWI modeling method and its application for the exploration area of northeastern Sichuan Basin,China. Geophysical and Geochemical Exploration, 2025, 49(5): 1090-1098.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2025.0037 或 https://www.wutanyuhuatan.com/CN/Y2025/V49/I5/1090

Fig.1 联合速度建模流程

Fig.2 深度域速度场对比

Fig.3 地质约束前(a)、后(b)的速度对比

Fig.4 川东北探区复杂地表下的地震数据

Fig.5 不同地震数据对比

Fig.6 不同地震数据频谱示意

Fig.7 全波形反演前后的速度对比

Fig.8 全波形反演前后的成像效果

Fig.9 基于不同偏移方法的全波形反演成像效果对比

Fig.10 老成果剖面与新成果剖面对比

Fig.11 老成果与新成果速度对比

Fig.12 M3井老成果剖面与新成果剖面对比

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