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一种基于非规则网格的地震波射线追踪方法
  • ISSN号:1000-1441
  • 期刊名称:《石油物探》
  • 时间:0
  • 分类:P[天文地球]
  • 作者机构:[1]中国石油大学(华东)地球科学与技术学院,青岛266580, [2]海信(山东)冰箱有限公司,青岛266580
  • 相关基金:This work was jointly supported by the National Science and Technology Major Project (No. 2016ZX05014-001-008), the National Key Basic Research Program of China (No. 2014CB239006), the National Natural Science Foundation of China (Nos. 41104069 and 41274124), the Open foundation of SINOPEC Key Laboratory of Geophysics (No. 33550006-15-FW20 99-0033), and the Fundamental Research Funds for Central Universities (No. 16CX06046A).
中文摘要:

最小二乘偏移能够压制不规则地震数据偏移时产生的偏移假象,但存在计算量巨大、收敛速度缓慢等问题。为了快速地压制偏移噪音,发展了基于奇异值谱约束的叠前平面波最小二乘逆时偏移方法(Plane-wave prestack least-squares reverse time migration, PLSRTM)。一方面,通过奇异值谱分析(Singular spectrum analysis, SSA)方法对角度域共成像点道集(Take-Off Angle Domain Common-Image Gathers, TADCIGs)进行预处理,以压制偏移假象,同时引入随机奇异值分解减小SSA的计算量。另一方面,由于偏移速度不准确时叠加成像结果不能有效地压制偏移噪音,将相邻角度平面波偏移结果的差异作为正则化约束加入误差泛函,以改善这一问题。对Marmousi模型数据的成像测试结果表明该方法能够快速压制平面波道集及不规则地震数据偏移产生的偏移假象,改善PLSRTM的成像质量;当偏移速度不准确时,该方法能够得到偏移噪音更少、构造更加连续的成像结果。

英文摘要:

Least squares migration can eliminate the artifacts introduced by the direct imaging of irregular seismic data but is computationally costly and of slow convergence. In order to suppress the migration noise, we propose the preconditioned prestack plane-wave least squares reverse time migration (PLSRTM) method with singular spectrum constraint. Singular spectrum analysis (SSA) is used in the preconditioning of the take-off angle-domain common-image gathers (TADCIGs). In addition, we adopt randomized singular value decomposition (RSVD) to calculate the singular values. RSVD reduces the computational cost of SSA by replacing the singular value decomposition (SVD) of one large matrix with the SVD of two small matrices. We incorporate a regularization term into the preconditioned PLSRTM method that penalizes misfits between the migration images from the plane waves with adjacent angles to reduce the migration noise because the stacking of the migration results cannot effectively suppress the migration noise when the migration velocity contains errors. The regularization imposes smoothness constraints on the TADCIGs that favor differential semblance optimization constraints. Numerical analysis of synthetic data using the Marmousi model suggests that the proposed method can efficiently suppress the artifacts introduced by plane-wave gathers or irregular seismic data and improve the imaging quality of PLSRTM. Furthermore, it produces better images with less noise and more continuous structures even for inaccurate migration velocities.

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期刊信息
  • 《石油物探》
  • 中国科技核心期刊
  • 主管单位:中国石化石油勘探开发研究院
  • 主办单位:中国石化石油勘探开发研究院 南京石油物探研究所
  • 主编:杨勤勇
  • 地址:南京市江宁区上高路219号
  • 邮编:211103
  • 邮箱:njsywt@163.net
  • 电话:025-68109811
  • 国际标准刊号:ISSN:1000-1441
  • 国内统一刊号:ISSN:32-1284/TE
  • 邮发代号:
  • 获奖情况:
  • 1995年获江苏期刊奖,2001年获中国石化集团公司科技期刊评比二等奖,1997年获中国地球物理学会颁发的地球物理传播奖
  • 国内外数据库收录:
  • 荷兰文摘与引文数据库,美国工程索引,中国中国科技核心期刊,中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版)
  • 被引量:10502