基于虚源估计的复杂上覆地层下地震相干成像

在上覆地层比较复杂的情况下,常规地震勘探方法常常难以得到好的成像.本文研究了基于地震相干避开复杂上覆地层对地震波的影响,利用VSP数据估计地震虚源直接对目的地层进行成像的方法.在地震相干成像过程中,震源子波对分辨率有比较大的影响,尤其是存在薄层的条件下,两个非常近的反射同相轴将无法辨认.利用估计出虚源地震子波的性质,对...

Seismic interferometry imaging based on virtual source estimation with complex overburden

Under the conditions of complex overburden, the results of conventional seismic exploration methods are always not good enough.Based on seismic interferometry, this paper studies a way to avoid the complex overburden and image the target stratum directly with virtual source generated from VSP data. The wavelet of the source affects the resolution of the seismic interferometric imaging, especially when there is a thin layer, which makes the distinguishing of the closely approached reflect events impossible. Based on the characteristics of the estimated virtual source wavelet, the wavelet is shaped to suppress the side lobes of the wavelet to improve the resolution of imaging. The numerical experiment shows that with complex overburden, the virtual source data generated from the VSP data can give a good image of the target stratum.