【摘要】 井间地震层析成像是井间地震技术的重要组成部分,而在地面地震勘探特别是在海上地震勘探中,斜井居多,因此,文章针对斜井层析成像的特点,先介绍了旅行时层析反演的基本原理,再根据Lanczos方法和QR分解算法详细推导了带阻尼的LSQR反演方法,且将此方法应用于二维斜井地震初至波走时层析成像中,用两个不同的斜井模型对算法进行了测试研究。结果表明:采用旅行时线性插值射线追踪的正演方法与带阻尼的LSQR反演技术得到的速度模型较好地反应了理论模型,说明了此算法在二维斜井地震层析成像应用中的正确性和有效性,为实际地震勘探工作提供了理论依据。更多还原

【Abstract】 Cross-hole tomography is an important part of cross-hole seismic techniques,and in the surface seismic exploration especiaily in marine seismic,mostly in slope cross-hole. Therefore,the article according to the characteristics of the slope cross-hole tomography,discussing the fundamentals of traveltime tomography inversion and on the basis of the Lanczos method and QR decomposition algorithm again,deducing the method of damping LSQR inversion algorithm in detail while applying the method to two-dimensional slope cross-hole first-break wave travel-time tomography,and using two different slope cross-hole models tests the algorithm. It turns out that using the method of linear travel-time interpolation ray tracing and the velocity model gotten from damping LSQR inversion algorithm can reflect the theoretical model quite well. It illustrates the correctness and effectiveness of the algorithm for two-dimensional slope cross-hole tomography,and provides theoretical basis for application.更多还原