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)

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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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摘要

  • 0 引言
  • 1 方法原理
  • 2 模型及实际资料试算
  • 3 结论
  • 参考文献