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首页> 外文期刊>Journal of geophysics and engineering >Q estimation using modified S transform based on pre-stack gathers and its applications on carbonate reservoir
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Q estimation using modified S transform based on pre-stack gathers and its applications on carbonate reservoir

机译：基于叠前道集的改进S变换Q估计及其在碳酸盐岩储层中的应用

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Pre-stack seismic data is acknowledged to be more favorable in estimating Q values since it carries much more valuable information in traveltime and amplitude than post-stack data. However, the spectrum of reflectors can be strongly altered by nearby reflector or side lobes of the wavelet, which thereby degrades the accuracy of Q estimation based on the pre-stack spectral ratio method. To solve this problem, we propose a method based on the modified S-transform (MST) for estimating Q values from pre-stack gathers, in which Q values can be obtained with regression analysis based on the relationship between spectral ratio slope and the square of offset. Through tests on a numerical model, we first prove advantages of this pre-stack spectral ratio method compared to the traditional post-stack method. Besides, it is also shown that application of MST would lead to a much more focused intercept, which is the kernel for the pre-stack method. Therefore, the accuracy of Q estimation using MST is further improved when compared with that of conventional S-transform (ST). Based on this Q estimation method, we apply relevant processing methods (e.g. inverse Q filtering and dynamic Q migration) in practice, in order to improve imaging resolution and gathering quality with better amplitude and phase relationships. Applications on a carbonate reservoir witness remarkable enhancements of the imaging result, in which features of faults and deep strata are more clearly revealed. Moreover, pre-stack common-reflection-point (CRP) gathers obtained by dynamic Q migration well compensate the amplitude loss and correct the phase. Its ultimate pre-stack elastic inversion result better characterizes the geologic rules of complex carbonate reservoir predominated by secondary-storage-space.
机译：公认的叠前地震数据在估计Q值方面更有利，因为它在走时和振幅方面比叠后数据具有更多有价值的信息。然而，反射器的光谱会被附近的反射器或小波旁瓣强烈地改变，从而降低了基于叠前光谱比方法的Q估计的准确性。为了解决这个问题，我们提出了一种基于改进的S变换（MST）的方法来估计叠前Q值，其中Q值可以通过基于频谱比斜率和平方之间的关系进行回归分析来获得。偏移量。通过对数值模型的测试，我们首先证明了该叠前谱比方法与传统叠后方法相比的优势。此外，还表明，MST的应用将导致更集中的拦截，这是叠前方法的核心。因此，与常规的S变换（ST）相比，使用MST的Q估计的精度进一步提高。基于这种Q估计方法，我们在实践中应用了相关的处理方法（例如反Q滤波和动态Q迁移），以提高成像分辨率并以更好的幅度和相位关系收集质量。在碳酸盐岩储层中的应用见证了成像结果的显着增强，其中断层和深层的特征更加清晰地显现出来。此外，通过动态Q偏移获得的叠前共反射点（CRP）聚集可以很好地补偿振幅损失并校正相位。其最终的叠前弹性反演结果更好地刻画了以二级储集空间为主的复杂碳酸盐岩储层的地质规律。

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