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川西坳陷内中浅层岩性气藏勘探中,地震振幅亮点异常是储层识别的重要依据,但越来越多的钻井证实“亮点”异常,也可能是泥岩、薄互层、致密砂体等众多非储层带来的陷阱。以川西坳陷德阳向斜内,典型完钻井井震分析为基础,总结出不同物性砂体地震响应特征,建立起“顶部强波谷、底部强波峰”、相邻波峰反射能量“上弱下强”的优质储层识别模式,同时利用相邻波峰反射能量“上强下弱,双强”等特征来排除振幅“亮点”陷阱,提高基于地震反射能量的储层预测精度,该方法具有简单、直观、易实现等特征,同时经钻井证实,预测结果准确可靠。
In seismic exploration of middle-shallow lithologic gas reservoirs in western Sichuan Depression, the anomalous seismic amplitude highlights are the important evidences for reservoir identification. However, more and more drilling wells have confirmed the “bright spot” anomaly and may also be mudstone, thin interbed, Tight sand body and many other non-reservoir trap. Based on the typical well-borehole seismic analysis of Deyang syncline in the western Sichuan depression, the seismic response characteristics of different physical sand bodies are summed up to establish a “strong trough at the top and a strong trough at the bottom” Weak and strong "reservoirs, and use the characteristics of adjacent peak reflection energy, weakness and strong double strength to eliminate the trap of amplitude and highlight and improve the reservoir based on seismic reflection energy Prediction accuracy. The method is simple, intuitive and easy to implement. At the same time, it has been confirmed by drilling that the prediction result is accurate and reliable.