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正演模型研究是采用AVO方法进行气藏检测的基础。选择合适的井在合成地震记录层位标定的基础上 ,研究含气砂岩的地震反射振幅随炮检距的变化关系和各种AVO属性参数的特征 ,以及含气砂岩与非含气砂岩在各项特征上的差异和变化。含气砂岩AVO异常属性特征的确定可以指导利用地震CMP道集的AVO反演结果进行可靠的含气砂岩储层分布预测。正演模拟结果证实 :苏里格庙气田二叠系盒8段含气砂岩主要为第Ⅲ类AVO异常响应 ,异常特征十分明显
Forward model study is the basis of AVO method for gas reservoir detection. Based on the calibration of synthetic seismographic horizon, the relationship between the amplitude of seismic reflection of gas-bearing sandstone and the variation of offset and the characteristics of various AVO attribute parameters are studied, and the relationships between gas-bearing sandstone and non-gas-bearing sandstone Differences and changes in terms of features. The determination of AVO anomalous attribute of gas-bearing sandstones can guide the prediction of gas-bearing sandstone reservoirs with AVO inversion results of seismic CMP gathers. The forward modeling results show that: the Permian Box 8 gas-bearing sandstone in the Suligemiao gas field is mainly the AVO anomaly of type III, and the anomalous characteristics are obvious