石油地球物理勘探2025，Vol.60Issue(3)：794-805,12.DOI:10.13810/j.cnki.issn.1000-7210.20240265
基于改进Padé逼近法的含激发极化效应瞬变电磁三维正演
3D forward modeling of transient electromagnetic method considering induced polarization effect based on improved Padé approximation method
摘要
Abstract
The exploration targets such as metallic minerals,sulfides,and oil and gas resources often exhibit a strong induced polarization(IP)effect,which causes distortion of transient electromagnetic(TEM)signals.Neglecting the IP effect frequently leads to difficulties in fitting TEM data and even results in erroneous inter-pretations.This study employs the time-domain finite volume method(FVM)and approximates the Cole-Cole model by using a Padé series to achieve 3D forward modeling of the TEM method considering the IP effect.Traditional methods for selecting the central frequency in the Padé series rely on qualitative analysis,which makes the forward modeling results highly sensitive to changes in the frequency-dependent parameter.This sen-sitivity limits the application of Padé approximation in regions with significant variability in the frequency-depen-dent parameter.To address this limitation,this study quantitatively evaluates the errors introduced during the Padé approximation process and proposes an adaptive selection algorithm based on error information.Multiple numerical experiments demonstrate the accuracy and effectiveness of the proposed algorithm.Finally,the dif-ferences in TEM responses between polarized and non-polarized media models are analyzed,and the charging and discharging processes of polarization anomaly bodies in TEM fields are simulated using an instance model.关键词
激发极化效应/Padé级数逼近/瞬变电磁法三维正演/Cole-Cole模型Key words
induced polarization effect/Padé approximation/3D forward modeling of transient electromagnetic method/Cole-Cole model分类
天文与地球科学引用本文复制引用
杨威,蔡盼盼,李清坤,刘礼煌,胡祥云,刘亚军..基于改进Padé逼近法的含激发极化效应瞬变电磁三维正演[J].石油地球物理勘探,2025,60(3):794-805,12.基金项目
本研究受中石化科研项目"超深碳酸盐岩油气藏地震—电磁联合描述技术研究"(P22875)、国家自然科学基金项目"含激电效应的时间域电磁法三维各向异性正反演研究"(42104077)、资源与生态环境地质湖北省重点实验室开放基金资助项目"广域电磁三维反演技术及其在铜绿山矿集区深部找矿中的应用研究"(HBREGKFJJ-202310)、国家自然科学基金项目"冰岛地区综合地球物理研究"(42220104002)及湖北省自然科学基金项目"基于三维探地雷达高速探测的道路病害智能反演方法"(2024AFD417)联合资助. （P22875）
