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随着油气勘探的不断深入,叠前深度偏移技术逐渐成为解决复杂构造区域成像问题的重要手段.考虑到逆时偏移精度高但效率低,而高斯束偏移具有高效、灵活等优势,本文将逆时偏移的理论思想应用于高斯束偏移中,发展了高斯束逆时偏移,即以Kirchhoff偏移为基础,利用高斯束叠加积分计算Green函数.其不仅保留了Kirchhoff偏移的高效性和灵活性,克服了其阴影区、焦散区、单次波至等缺陷,而且还具有波动方程偏移对陡倾角的成像优势,解决了其计算量大的问题.模型和实际资料试算验证了高斯束逆时偏移方法的正确性、有效性和实用性,可以作为一项实用化技术应用于偏移成像和层析速度建模中.
With the deepening of oil and gas exploration, prestack depth migration technology has gradually become an important method to solve imaging problems in complex tectonic regions.Considering the high accuracy and low efficiency of inverse time migration, Gaussian beam migration has the advantages of high efficiency and flexibility, In this paper, the theory of inverse time migration is applied to Gaussian beam migration, and Gaussian beam inverse time migration is developed, that is, based on Kirchhoff migration, Gaussian beam superposition integral is used to calculate Green function, which not only retains Kirchhoff migration Which overcomes the defects of its shadow area, caustic area and single wave to the other, but also has the imaging advantage of the wave equation migration to the steep inclination, and solves the problem of large calculation amount. The model and the actual The experimental data verify the correctness, validity and practicability of the Gaussian beam inverse time migration method, which can be used as a practical technology in migration imaging and tomographic velocity modeling.