基于Gabor变换反褶积技术在渤海某工区的应用研究

发布时间：2018-06-03 14:01

本文选题：非平稳性反褶积 + Wiener反褶积　；参考：《地球物理学进展》2017年02期

【摘要】：使用常规的Wiener反褶积必须假设震源子波在地层旅行过程中是平稳的即一成不变的,这个前提条件与实际野外地震资料采集差别较大,而基于Gabor变换反褶积技术考虑到地震能量的衰减、子波的形变等非平稳性特征.地震道在Gabor域可因式分解成三项即震源子波、衰减函数和反射系数,该技术设计POU窗函数,并利用此函数在Gabor域对地震信号进行局部时频分解.Gabor域反褶积算法在Gabor域通过除以衰减函数和震源子波的乘积来估算地层反射系数,然后再做Gabor反变换可求得时间域的地层反射系数.理论模型的测试和实际地震资料的应用均表明,与Wiener反褶积相比较,基于Gabor变换反褶积可补偿中深层的能量衰减并因此拓宽有效频带和提高时间分辨率.
[Abstract]:Using conventional Wiener deconvolution, the source wavelet must be assumed to be stationary or invariant in the course of formation travel, which is quite different from the actual field seismic data acquisition. Based on the Gabor transform deconvolution technique, the non-stationary characteristics such as the attenuation of seismic energy and the deformation of wavelet are taken into account. Seismic traces in Gabor domain can be factorized into three terms: source wavelet, attenuation function and reflection coefficient. The POU window function is designed by this technique. The local time-frequency decomposition of seismic signal in Gabor domain and deconvolution algorithm in Gabor domain are used to estimate the formation reflection coefficient by dividing the attenuation function and the product of source wavelet. Then the reflection coefficient in time domain can be obtained by Gabor inverse transformation. The test of theoretical model and the application of practical seismic data show that compared with Wiener deconvolution, the deconvolution based on Gabor transform can compensate for the energy attenuation in the middle and deep layers, thus widening the effective frequency band and improving the time resolution.
【作者单位】：中海油田服务股份有限公司物探事业部物探研究院;
【基金】：国家科技重大专项(2011ZX05023 00 YF 2013-01)资助
【分类号】：P631.44

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