利用谱蓝化和有色反演分辨薄煤层

Thin Coal Bed Resolution by Using Seismic Spectral Blueing and Colored Inversion

基于模型反演在实际应用中,存在反演结果过度模型化、反演可能扩展到地震频带以外以及估计的子波不准确导致反演误差较大等不足,谱蓝化和有色反演可有效白化地震子波,在地震带宽内改善频谱,提高地震分辨率,同时确保谱蓝化后的地震数据保持地下地层的真实反射系数。设计优化了谱蓝化和有色反演技术流程并将其应用在煤层气勘探三维地震资料中,有效地提高了反演波阻抗体对薄煤层的分辨能力。同时,反演结果被用于辅助精细构造解释薄煤层,纠正了单纯利用地震原始数据体解释层位出现的错误。

It has proved that the model simulated by seismic inversion in practice is often too much model- dependent and sometimes go beyond the seismic band limit as well as be erroneous for using inaccurate esti- mated wavelet. Seismic spectral blueing and colored inversion can effectively whiten the seismic wavelet to enhance seismic resolution and ensure that the blued seismic data show the true reflectivity of the subsur- face without going beyond the seismic band limit. In this paper,we design the optimal workflow of seismic spectral blueing and colored inversion and use it to the 3D seismic data acquired for coalbed methane explo- ration. The results show that application of spectral blueing and colored inversion improves the seismic res- olution of thin coal beds. Simultaneously, the colored inversion acoustic impedance is applied to aid at the interpretation of thin coal beds, which removes the erroneous interpretation occurred during previous inter- pretation using merely the original seismic data.