基于改进的积分展开相位谱识别侧叠型砂体叠置区

An Improved Method for Identifying Side-Stack Type Sandbody Overlay Regions by Integral Expansion Phase Spectrum

摘要: 当前在河流相砂体叠置区域的识别方面，通常使用地震属性切片和基于地震沉积学的地层切片方法，或是通过瞬时属性和沿层平均属性等多种属性结合来识别叠置区域。对现有积分展开相位谱识别河道叠置区不连续性界限的方法进行改进，优化因分辨率与拾取方法导致提取位置不统一的时窗提取方法，对短时窗地震信号时间域补零从而细化相位频谱，以及在主值相位谱零频率处充零确保相位展开的稳定性。并用基于改进后的积分相位谱方法识别砂体叠置区，通过建立多种不同叠置情况的理论模型进行实验与胜利探区ZH地区实际资料测试。结果表明改进后的积分展开相位识别方法，时窗选取能更精确提取对应点位，展开相位谱细化且计算结果更准确，更稳定，积分展开相位谱识别叠置区域效果更好，通过实际资料验证该改进方法的有效性。

Abstract: In the identification of fluvial sandbody overlay areas at present, seismic attribute slicing and stratigraphic slicing based on seismic sedimentology are often used to identify overlapping areas, or through a combination of transient attributes and averages along the bed attributes. To improve the existing integral expansion phase spectrum identification fluvial facies sandbody overlay regions discontinuity boundary method, this paper optimizes the time window extraction method which had the problem that different time window positions are selected because of different resolution and picking methods, increases the phase resolution by adding zero to the time domain of short-time window seismic signal, and resets the zero frequency of the conventional phase spectrum to zero to ensure the stability of phase unfolding. The integral expansion phase spectrum method based on the improved method is used to identify the sandbody overlay area, as theoretical models of different superposition conditions were established to test the actual data in the ZH area of Shengli exploration area. The results show that the improved integral unexpansion phase recognition method can extract the corresponding points more accurately with time window selection, the resolution of the unfolded phase spectrum is higher, the calculation results are more accurate and more stable, and the integral expansion phase spectrum recognition effect is better. The effectiveness of the improved method is verified by actual data.