检索结果-南通市图书馆

An improved method for Internal multiple elimination using the theory of virtual events

Petroleum Science 2022年第6期19卷 2663-2674页

作者： Pei-Nan Bao Ying Shi Wei-Hong Wang Wei Zhang Zhe-Jun Pan Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development Ministry of EducationNortheast Petroleum UniversityDaqingHeilongjiang163318China School of Earth Sciences Northeast Petroleum UniversityDaqingHeilongjiang163318China School of Information and Communication Engineering Faculty of Electronic and Information EngineeringXi'an Jiaotong UniversityXi’anShaanxi710049China National Engineering Laboratory for Offshore Oil Exploration Xi'an Jiaotong UniversityXi’anShaanxi710049China

Compared with first-order surface-related multiples from marine data,the onshore Internal multiples are weaker and are always combined with a hazy and occasionally strong interference pattern.It is usually difficult to discriminate these events from complex targets and highly scattering overburdens,especially when the primary energy from deep layers is weaker than that from shallow layers.The Internal multiple elimination is even more challenging due to the fact that the velocity and energy difference between primary reflections and Internal multiples is tiny.In this study,we propose an improved method which formulates the elimination of the Internal multiples as an optimization problem and develops a convolution factor T.The generated Internal multiples at all interfaces are obtained using the convolution factor T through iterative inversion of the initial multiple model.The predicted Internal multiples are removed from seismic data through subtraction.Finally,several synthetic experiments are conducted to validate the effectiveness of our approach.The results of our study indicate that compared with the traditional virtual events method,the improved method simplifies the multiple prediction process in which Internal multiples generated from each interface are built through iterative inversion,thus reducing the calculation cost,improving the accuracy,and enhancing the adaptability of field data.

关键词： Internal multiple Convolution factor Elimination Virtual events

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Interface Controlled multiple Elimination by Sparsity Inversion

引用

Communications in Computational Physics 2020年第6期28卷 459-476页

作者： Lanshu Bai Yike Liu Huiyi Lu Institute of Geophysics China Earthquake AdministrationBeijing 100081China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China Kerogen Energy Services Co. LtdBeijing 100101China

Removing Internal multiples remains an important but challenging problem in seismic processing.The generalized Estimation of Primaries by Sparsity Inversion(EPSI)method minimizes data residuals between the calculated and observed wave-form using the sparse constraint of primary impulse responses to predict multiples and remove them directly,instead of using the conventional adaptive subtraction method.Even though the generalized EPSI method provides a good estimate of the primaries and multiples when they overlap,it is limited by intensive computational cost.In this paper,we introduce two strategies to improve computational efficiency.First,the interface-controlled strategy is introduced by only selecting high-amplitude primary responses related to the interfaces with strong impedance contrasts to estimate multiples.The computational time is approximately proportional to the number of involved reflectors and usually,most of the Internal multiple energy in the data is only related to a few strong reflectors.Therefore the modified method can remove most of the Internal multiples in fewer computations than in the generalized EPSI,which loops through all the interfaces.Next,an approximate formula for estimating primary impulse responses is proposed by neglecting a computationally intensive term which corresponds to the primary responses estimated from Internal multiples.According to our analyses and experiments,in most cases,the contribution of this term is negligible because the Internal multiples are weak.Therefore,the computational efficiency can be improved without significantly losing quality when estimating most primaries and multiples.In order to demonstrate this,multiple elimination of a two-layered simple data and the Pluto data are implemented.We find that the modified method can yield reliable results that require fewer computations.The improvements of the modified method may encourage the use of the generalized EPSI method in industry.

关键词： multiple Internal multiple interface-controlled multiple elimination estimation of primaries by sparsity inversion

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：