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Effects of wave propagation in random media on seismic explorations: Studies based on numerical simulations

机译：波在随机介质中传播对地震勘探的影响：基于数值模拟的研究

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摘要

The scattered seismic waves due tosmall-scale random heterogeneities in the earth's crustcan be serious noises in the data from the seismicexplorations, aimed at the large-scale structures.They may lead to misinterpretations of the processeddata and hence wrong conclusions. This paper reviewsthe studies to assess such effects of scattering on theseismic explorations, using finite-differencesimulations of wave propagation. A series of numericalexperiments based on simple models of the heterogeneouscrust gave the following results: in reflection recordsections, the scattered waves could yield falsereflection patterns as well as smear the true ones; thewide-angle reflection surveys could not distinguishthe random heterogeneities from fine-scale layers; theapparent crustal velocities estimated from thewide-angle surveys were also influenced by theheterogeneities. Realistic modeling of theheterogeneities is also discussed based on availabledata, such as well logs and geological maps.
机译：地壳中的小规模随机异质性引起的分散地震波可能是针对大型结构的地震勘探数据中的严重噪声，可能导致对处理后的数据的误解，从而得出错误的结论。本文回顾了使用波传播的有限差分模拟来评估散射对地震勘探的影响的研究。基于异质地壳简单模型的一系列数值实验得出以下结果：在反射记录段中，散射波可能会产生假反射图案并涂抹真实的反射图案。广角反射调查无法区分出精细尺度层的随机异质性;广角调查估计的表观地壳速度也受到非均质性的影响。还基于可用数据（如测井和地质图）讨论了非均质性的现实建模。

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