【摘要】 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 ,异常特征十分明显更多还原

【Abstract】 Forward modeling study is the initial step for carrying out gas dete ction by using AVO (amplitude versus offset) analysis. On the basis of the strat a labelled by the synthetic seismogram for the appropriately selected wells, it is well analyzed that the seismic reflection amplitude varying with offset, and AVO attribute properties of gas bearing sandstones, and the differences and va riations of all features between gas bearing and gas free sandstones. Identifi cation of abnormal attribute properties for a specific gas bearing sands will l ead to correct detection of gas occurence in sands reservoir via AVO inversion f rom seismic CMP gathering (common points). As a consequence, from the forward mo deling, it is proved that gas bearing sandstones in He 8, Permian, Shuligemiao gas field, are mainly the AVO abnormal response of Type Ⅲ with extremely obvio us features.更多还原