苏里格庙地区AVO气层类型及检测效果

The Analysis of AVO Gas Layers Type and Testing Affect of Sulige Areas in Eerduosi Basin.

提取包含在叠前地震数据中的大量气层有效信息是鄂尔多斯盆地苏里格庙地区天然气层预测成败的关键。为此,对苏里格庙地区重点进行了AVO气层预测方法研究。通过储层地球物理特征分析、AVO正演模型,及不同AVO属性参数处理分析表明,苏里格庙地区盒8气层属于第三类型低阻抗砂岩气层,在CMP道集上,其AVO响应特征表现为振幅随炮检距的增大明显增强,在全道迭加剖面上,气层并没有明显的强反射(亮点)特征,但在不同炮检距迭加剖面上,气层的振幅特征明显不同,在远道迭加剖面上,明显表现为强反射,而近道叠加则表现为弱反射。

It is the key that the successful predict of natural gas layers lies in correct and valid gas information refining from seism data.Based on the data,the AVO gas layers type predicting work has been intensively analyzed in these areas. By reservoir physical geography characteristics analyzing, AVO transform model and different AVO parameters analyzing, the con- clusion has been obtained is that HE8 gas layers belong to the third kind low resistance sand gas layers . The reflect characteristics in CMP trace assemblage are that swing are consistent with the increasing shot-geophone distance. At the superposition cross-section, gas layers don't show strong light point, but at different shot-geophone distance cross-section it show that the swings are very different . At the long distance superposition, it show strong reflect phenomenon, while in the near superposition it show weak reflect.