中国石油大学学报（自然科学版）2024，Vol.48Issue(1)：70-76,7.DOI:10.3969/j.issn.1673-5005.2024.01.008
面向深层干热岩体的全波形速度反演建模方法
Velocity building using full waveform inversion for deep hot dry rock
摘要
Abstract
Severe seismic signal attenuation with increasing exploration depth renders conventional velocity building methods less accurate for high-precision exploration of deep hot dry rock(HDR)bodies.To address this challenge,the full waveform inversion(FWI)method is used to enhance the accuracy of velocity building.However,FWI encounters issues like slow convergence,limited inversion depth,and susceptibility to local optimal solutions due to constraints imposed by local optimi-zation algorithms.To mitigate these challenges,we introduce a novel approach that utilizes preconditioning and smoothing gradients in conjunction with the conjugate gradient optimization algorithm.This strategy aims to rectify unbalanced illumina-tion issues and speed up convergence.Additionally,to alleviate the issue of local minima,a local coherence misfit is inte-grated into FWI to update the velocity model.Numerical simulations conducted on typical HDR models show that the pro-posed method is capable of circumventing the negative effects of cycle skipping issues,ensuring stable iterative updating even with highly inaccurate initial model.Furthermore,the method significantly improves the depth and accuracy of inversion,providing a more precise depiction of high-velocity rock bodies,eventually obtaining high-accuracy velocity models in both shallow and deep layers.The FWI method proposed in this study provides a practical and efficient velocity building tool for detecting deep high-temperature granite bodies.关键词
干热岩/高温花岗岩体/全波形反演/深层速度建模/局部相似性Key words
hot dry rock/high-temperature granite body/full waveform inversion/velocity building for deep structure/local coherence分类
天文与地球科学引用本文复制引用
杨继东,于由财,刘朋,高建明,黄建平,杨永红..面向深层干热岩体的全波形速度反演建模方法[J].中国石油大学学报（自然科学版）,2024,48(1):70-76,7.基金项目
国家自然科学基金优秀青年项目(海外)(ZX20230152) （海外）
山东能源集团深层高温地热重大科技项目(SNKJ2022A06-R23) （SNKJ2022A06-R23）
山东省海洋科技基金青岛海洋科学与技术国家试点实验室项目(2021QNLM020001) （2021QNLM020001）
创新研究群体项目(41821002) （41821002）
中国石油重大科技专项(ZD2019-183-003) （ZD2019-183-003）
