The Ordovician carbonate reservoir in Tahe oilfield,Tarim basin,is buried very deep with a depth being larger than 5000 m.The reservoir is featured by fracture-vuggies,and the formation has extremely strong heterogeneity in both the vertical and horizontal direction.These features lead to low signal-to-noise ratio and low resolution of the seismic reflection data,and in turn to the difficulty in characterization of carbonate reservoirs.Aiming at these problems,here we use a stabilized inverse-Q filter to process the three-dimensional (3D) seismic data in Tahe oilfield,conducting seismic amplitude compensation and waveform phase correction,simultaneously.Comparing the inverse-Q filtered result directly with the raw seismic data in terms of seismic profiling,interior information within the reservoir,characterization of faults and fracturevuggies,we demonstrate the advantages of stabilized inverse-Q filtering in enhancing seismic resolution,strengthening weak signals,and improving lateral continunity of reflections,and reveal that this method can improve the accuracy of fracture-vuggy characterization in the Ordovician carbonate reservoirs.%塔里木盆地塔河地区的奥陶系碳酸盐岩储层埋藏深,其深度超过5000 m,储集体类型以裂缝、缝洞为主,储层的纵向和横向上都具有极强的非均质性.这些特点导致反射地震数据的信噪比低、分辨率低,从而使得碳酸盐岩储层特征描述的难度增大.针对这些问题,本文运用稳定化反Q滤波方法对塔河地区的三维地震数据进行提高分辨率处理,同步实现地震振幅补偿和子波相位校正.处理结果与原始地震数据进行地震剖面面貌、储层内幕信息、断裂缝洞刻画等方面的直接对比,一方面展示反Q滤波方法在提高分辨率、提高弱反射能量、以及增强反射同相轴的空间连续性等方面的优势,同时展示稳定化反Q滤波方法能够提高对奥陶系碳酸盐岩缝洞储集体的特征描述精度.
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