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基于时变数据映射的地震叠加成像方法

岳玉波1 张建磊1 张超阳1 史云燕2 熊彦荣3 孙鹏飞4

(1.东方地球物理公司物探技术研究中心, 河北涿州 072751)
(2.东方地球物理公司研究院处理中心, 河北涿州 072751)
(3.东方地球物理公司采集技术中心, 河北涿州 072751)
(4.河北工程大学地球科学与工程学院, 河北邯郸 056038)

【摘要】在海底节点(OBN)和山地地震数据的处理过程中,震源和接收点之间往往存在巨大的高程差,此时基于水平地表假设的共中心点(CMP)叠加成像方法已经不再适用。针对该问题,提出一种基于时变数据映射的共反射点(CRP)叠加成像方法。该方法首先利用叠加速度计算输出剖面中时变的CRP采样点,然后利用改进的双平方根公式计算经由该CRP采样点的双程地震波走时,完成数据的动校正处理。该方法不但可以有效地改善OBN和山地数据叠加成像效果,还可以准确地估计地下的叠加速度信息,用于后续的处理环节。模型和实际数据成像结果证明,基于时变数据映射的CRP叠加优于传统CMP叠加。

【关键词】 共反射点;时变;数据映射;地震叠加成像;

【DOI】

【基金资助】 国家科技重大专项“新一代地球物理油气勘探软件系统”(2017ZX05018-001); 国家自然科学青年基金项目“地质数据作为变量的水平变密度联合反演模型”(41604069); 河北省教育厅青年基金项目(QN2017310);

Seismic Data Stacking Based on Time-varying Mapping

YUE Yubo1 ZHANG Jianlei1 ZHANG Chaoyang1 SHI Yunyan2 XIONG Yanrong3 SUN Pengfei4

(1.R&D Center BGP, CNPC, Zhuozhou, Hebei Province, China 072751)
(2.BGP Seismic Data Processing Center, Zhuozhou, Hebei Province, China 072751)
(3.BGP Acquisition Technology Center, Zhuozhou, Hebei Province, China 072751)
(4.School of Earth Science and Engineering, Hebei University of Engineering, Handan, Hebei Province, China 056038)

【Abstract】Due to the existence of large source-receiver elevation differences in ocean-bottom-node (OBN) and mountain data, conventional common-midpoint (CMP) stacking based on the assumption of horizontal land surface is no longer feasible. We propose common reflection point (CRP) stacking based on time-varying data mapping as an alternative. We use stacking velocity to calculate time-varying CRP sampling points in output sections. At each CRP sampling point, two-way time is calculated using a modified double-square-root formula for NMO correction. We can use this method to improve the stacking quality for OBN and mountain data, and we also can obtain accurate stacking velocity for subsequent processing. Model and field data tests show that CRP stacking based on time-varying data mapping is better than CMP stacking.

【Keywords】 common reflection point; time varying; data mapping; stacking;

【DOI】

【Funds】 National Science and Technology Major Project (2017ZX05018-001); Youth Program of National Natural Science Foundation of China (41604069); Youth Program of Hebei Education Department Foundation (QN2017310);

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This Article

ISSN:1000-7210

CN: 13-1095/TE

Vol 55, No. 02, Pages 331-340+230

April 2020

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Article Outline

Abstract

  • 0 Introduction
  • 1 Methodology
  • 2 Tests of model and real data
  • 3 Conclusion
  • References