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首页> 外文期刊>Journal of geophysics >Significance of Lower Frequencies in Seismic Inversion
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Significance of Lower Frequencies in Seismic Inversion

机译：地震反演中较低频率的意义

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Inversion of seismic data is routinely performed to better understand the subsurface rock properties in terms of lithology and fluid. Inversion of seismic data produces layer properties that look similar to geological sections and are easy to interpret. Besides, properties of reservoirs like porosity, volume of clay and net pay can be readily derived from inverted acoustic impedance using inter relationship of these reservoir properties with the elastic properties measured at wells in the study area. While inversion enhances the resolution of subsurface image through reduction of noise and wavelet tuning effects, certain issues need to be taken care before the inverted rock properties can be used for quantitative interpretation (QI). One of the most important issues is the selection of an appropriate low frequency model that links relative and absolute rock properties. Had the traditional seismic data itself possessed a continuous and broad range of frequencies starting from O Hz, the inversion of seismic data would have directly yielded absolute rock properties ready for quantitative interpretation. We explain the importance of low frequency modeling through the selection of two different kinds of low frequency models, one from well data alone, while the other incorporating well data as well as seismic velocities as the compaction trend. To assess the impact of low frequencies, Constrained Sparse Spike Inversion was carried out on one of the data sets of Assam Arakan basin at the Eocene level. The results show clearly the benefits of using seismic velocity in low frequency modeling for reservoir characterization in exploration and appraisal settings that leads to reduced dependency on scanty well-information.
机译：常规执行地震数据的反转，以便在岩性和流体方面更好地了解地下岩石性质。地震数据的反转产生看起来类似于地质切片的层性质，并且易于解释。此外，使用这些储层性质与研究区域中的孔中测量的弹性特性的互际关系，可以容易地从倒置的声阻抗衍生出孔隙率，粘土的体积和净工资的储存器的性质。虽然反演通过降低噪声和小波调谐效果来增强地下图像的分辨率，但在倒置岩石属性可用于定量解释（Qi）之前需要注意某些问题。最重要的问题之一是选择相对和绝对岩石属性的适当低频模型。如果传统的地震数据本身具有从O Hz开始的连续和广泛的频率，地震数据的反转将直接产生绝对的岩石性能，准备定量解释。我们通过选择两种不同的低频模型来解释低频模型的重要性，单独使用井数据，而另一个掺入井数据以及地震速度作为压实趋势。为了评估低频的影响，在群岛水平的ASSAM Arakan盆地的一个数据组上进行约束稀疏峰值反演。结果显然显示了利用勘探和评估环境中的储层表征低频建模中的地震速度的益处，从而导致减少依赖于恶劣的井信息。

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