波阻抗反演技术及其应用效果

Elastic Impedance Inversion Technology and Its Application Effect

山西潞安常村矿N4采区位于常村井田西北部,区内煤系地层较平缓,其煤层密度、速度与上下围岩有较大差异,特别是3#、15#煤层可形成能量较强的反射波。在常规地震剖面上,15#煤层反射波为无法区分三个分层的复合波,经STRATA反演后其地震剖面明显存在三个独立的反射波,特别是15#-3煤层的波阻抗明显低于围岩的波阻抗。通过实例还发现,地震反演技术的应用能够明显提高地震资料的解释精度,可精确划分地层,解释断层及陷落柱。地震反演技术在测井资料与连续观测的地震资料结合的基础上,可以突破地震频带的限制,提高纵向分辨率。

The Changcun coalmine N4 wining district is situated at northwestern part of Changcun minefield, Luan, Shanxi. Coal measures strata in the area is rather gentle, its coal seam density and velocity have larger differentia with surrounding rocks above and under coal seam, especially the Nos.3 and 15 coal seams can form reflection wave with stronger energy. On conventional seismic sections, reflection wave of No.15 coal is composite reflections and cannot partition three coal slices. After the STRATA inversion, three independent reflections obviously existed on seismic sections, especially the elastic impedance of No.153 coal is obviously lower than that of surrounding rocks. Through examples have found, the application of seismic inversion technology can improve seismic data interpretation precision, divide strata accurately, find out faults and subsided columns. Based on combination of well logging data and continuously observed seismic data, can break through restrictions of seismic wave band to improve longitudinal resolution.