川西南永探1井区火山岩储层预测方法及应用

四川盆地西南地区火山岩气藏地质条件十分复杂、岩相变化大、物性变化快、储层非均质性强,地震储层预测面临诸多技术挑战。以永探1井区为研究对象,通过井震标定和正演模拟,确定不同岩相的地震响应特征,通过多属性融合,预测岩相平面分布。基于地震岩石物理分析,明确储层敏感参数,应用叠后地震反演技术,进行敏感参数反演,在此基础上根据岩石物理分析结果将弹性参数转换为储层物性参数,开展储层预测。结果表明,该方法能准确地预测出研究区块目的层火山岩优质储层分布,与实际钻井结果吻合程度高,可为该地区下一步火山岩储层精细描述及生产部署提供指导。

Volcanic Reservoir Prediction Method and Application in the Well Yongtan 1, Southwest Sichuan

The volcanic gas reservoirs in the southwestern Sichuan Basin have complex geological conditions, large lithofacies changes, rapid physical property changes, and strong reservoir heterogeneity. Seismic reservoir prediction faces many technical challenges. The seismic response characteristics of different lithofacies were determined by well seismic calibration and forward modeling in Yongtang-1 well area. Through multi-attribute fusion, the planar distribution of lithofacies is predicted. In the part of reservoir prediction research, based on the results of petrophysical analysis, the reservoir sensitive parameters are clarified. Use post-stack seismic inversion methods to perform sensitive parameter inversion. The inversion results are used for attribute convergence analysis and favorable reservoir prediction. The results show that this method can accurately indicate the effective reservoir distribution of volcanic rocks in the target area. The method is in good agreement with the actual drilling data and plays a certain guiding role in the next stage of volcanic rock exploration.