[1]袁茂林.最小二乘叠前时间偏移在川东南复杂构造成像中的应用[J].复杂油气藏,2021,14(03):43-47.[doi:10.16181/j.cnki.fzyqc.2021.03.008]
 YUAN Maolin.Application of least-squares migrationin imaging of complex structures in Southeast Sichuan[J].Complex Hydrocarbon Reservoirs,2021,14(03):43-47.[doi:10.16181/j.cnki.fzyqc.2021.03.008]
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最小二乘叠前时间偏移在川东南复杂构造成像中的应用()
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《复杂油气藏》[ISSN:1674-4667/CN:31-2019/TQ]

卷:
14卷
期数:
2021年03期
页码:
43-47
栏目:
油气勘探
出版日期:
2021-10-25

文章信息/Info

Title:
Application of least-squares migrationin imaging of complex structures in Southeast Sichuan
作者:
袁茂林
中国石化勘探分公司油气勘探管理部,四川 成都 610041
Author(s):
YUAN Maolin
Oil and Gas Exploration Management Department of Sinopec Exploration Company,Chengdu 610041,China
关键词:
成像分辨率振幅保真度叠前时间偏移岩溶缝洞高陡构造断裂
Keywords:
imaging resolutionamplitude fidelitypre-stack time migrationcave-cleft bodiessteep-dip structuresfaults
分类号:
P631
DOI:
10.16181/j.cnki.fzyqc.2021.03.008
文献标志码:
A
摘要:
地震偏移成像本质上是地下反射系数经过Hessian算子滤波后的模糊化结果,成像分辨率和振幅保真度较低。为了消除Hessian算子的影响,将地震成像看作最小二乘意义下的反演问题,通过引入一对互为共轭关系的叠前时间偏移/反偏移算子,采用共轭梯度法迭代求取与地震数据相匹配的反射系数最优解。理论模型和实际资料处理表明,最小二乘叠前时间偏移(LS-PSTM)能够压制偏移噪声并提高成像分辨率和振幅保真度,有利于改善川东南地区茅口组岩溶缝洞体、高陡构造以及断裂成像质量。
Abstract:
Seismic migration imaging is essentially the fuzzy result of underground reflection coefficient filtered by Hessian operator,and the imaging resolution and amplitude fidelity are low.In order to eliminate the influence of the Hessian operator,the seismic imaging is regarded as an inversion problem in the sense of least squares,by introducing a pair of pre-stack time migration/demigration operators that are conjugate relations with each other,the conjugate gradient method is used to iteratively obtain the optimal solution of the reflection coefficient matching the seismic data.The theoretical model and actual data processing show that the least-squares pre-stack time migration (LS-PSTM)can suppress the migration noise and improve the imaging resolution and amplitude fidelity,which is beneficial to improve the imaging quality of karst fractures and caves,high-steep structures,and faults in the Maokou Formation in southeastern Sichuan.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2021-05-06;改回日期:2021-07-12。
第一作者简介:袁茂林(1990—),硕士,工程师,主要从事地震采集与地震反演成像工作。E-mail:yuanml.ktnf@sinopec.com。
基金项目:国家科技重大专项“页岩气勘探地震资料采集处理技术研究”(编号2017ZX05036-005-006)。
更新日期/Last Update: 2021-10-25