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速度反演在水合物勘探中占有重要位置。本文讨论了精细走时速度分析、全波形速度反演方法和它们的初步试算结果。精细走时速度分析方法对叠前时间偏移数据进行构造化,尽量挖掘了数据的分辨能力;利用谱分析的方法,稳定性好;在空间上提高了分析的密度;自动拾取的速度具有较高的精度;是一种实用的精细速度分析方法。全波形速度反演利用观测数据和模拟数据的残差计算搜索方向并不断修正模型,把模拟数据和观测数据达到最佳拟合的速度模型作为反演结果,具有更高的分辨能力。文中探讨了两种方法在我国南海含水合物地层勘探中应用的可能性。
Speed inversion plays an important role in hydrate exploration. This article discusses the elapsed time velocity analysis, the full waveform velocity inversion method and their preliminary trial results. The time-migration data of prestack time is constructed by the method of precise traveltime velocity, and the data resolution is exploited as much as possible. The spectral analysis method is used to improve the stability of the data, and the analysis density is increased spatially. The speed of automatic pick-up is higher Precision; is a practical fine speed analysis method. Full-waveform velocity inversion uses the observed data and the residuals of the simulated data to calculate the search direction and continuously modifies the model. The velocity model that best matches the simulated data with the observed data is used as the inversion result to obtain a higher resolving power. The paper discusses the possibility of applying the two methods in the exploration of the hydrate strata in the South China Sea.