The desert in central Tazhong area is characterized by complex near-surface and subsurface conditions, poor-quality seismic data, difficult in the imaging of Ordovician inner fracture-cavity system, etc. Aiming at the problems, we studied the supporting processing techniques for the imaging of Ordovician fracture-cavity system in Tazhong area. The research results figure out four key steps in the imaging of Ordovician fracture-cavity system. Then, a series of supporting processing techniques were established. The processing result indicated that the series of techniques can greatly improve the imaging quality of Ordovician fracture-cavity system,make fracture characteristics more clear and highlight the string seismic anomaly reflection response, which obviously enhanced the imaging precision of Ordovician weathered formation and inner karst caves providing technical support for the seismic data processing of Tazhong desert area.%针对塔中沙漠区近地表和地下地质条件复杂、地震资料品质差、奥陶系内幕缝洞系统成像困难等问题,开展了塔中沙漠区奥陶系缝洞系统精细成像配套处理技术研究,认为叠前保护低频去噪、地表一致性反褶积、速度模型的优化、多次波消除等4个环节是该区奥陶系缝洞系统可靠成像的关键技术.建立了一套塔中沙漠区奥陶系缝洞系统成像的配套处理技术,该技术的应用使研究区缝洞系统的地震资料成像品质较前期有明显提高,成像剖面上断裂特征清晰、串珠状地震反射异常特征突出,大大提高了该区奥陶系风化面及内幕岩溶特征的成像精度.
展开▼
