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河道砂体是陆相含油气盆地最重要的储集类型之一,其边界识别和厚度定量预测是储层预测的热点难题。本文在总结现有方法技术的基础上,提出一种利用频率域峰值属性进行河道砂体边界识别和厚度定量预测的新方法。对典型河道薄砂体地震反射进行了正演模拟,构造了一种新的地震属性——峰值频率-振幅比,研究表明:峰值频率属性对地层厚度变化敏感,振幅属性对地层岩性变化敏感,两者比值突出河道砂体的边界,同时,借助峰值频率与薄层厚度间存在的定量关系进行薄砂体厚度计算。实际数据应用表明,地震峰值频率属性可以较好的刻画河道的平面展布特征;峰值频率-振幅比属性可以提高对河道砂体边界的识别能力;利用频率域地震属性进行砂体边界识别及厚度定量预测是可行的。
The channel sand body is one of the most important reservoir types in the continental oil and gas basin. The boundary identification and the quantitative prediction of the thickness are the hot topics in reservoir prediction. Based on the summarization of existing methods and techniques, this paper presents a new method to identify the boundary of river sandbodies and to predict the thickness quantitatively by using the peak values of frequency domain. The seismic reflection of typical channel thin sand body is simulated and a new seismic attribute-peak frequency-amplitude ratio is constructed. The results show that the peak frequency attribute is sensitive to the variation of formation thickness and the amplitude attribute is sensitive to the lithology change of formation , The ratio between them prominences the boundary of river sand body. At the same time, the thickness of thin sand body is calculated by the quantitative relationship existing between the peak frequency and the thickness of thin layer. The application of the actual data shows that the peak frequency attribute of the earthquake can well characterize the plane distribution of the river channel. The peak frequency-amplitude ratio property can enhance the identification ability of the river sand boundary. The seismic attribute of the frequency domain can be used to identify the sand body boundary and the thickness Quantitative forecasting is feasible.