裂缝介质中地震波方位AVO特征分析

预测储集层中的有利裂缝发育带及裂缝发育的主方位在油气勘探开发中具有重要的意义,裂缝的存在将导致介质属性的变化,不同的裂缝发育模式具有不同的表现特征,地震反射波振幅的方位变化就是一个重要的特征。对不同裂缝各向异性地质模型的地震波方位AVO特性进行了分析,建立地震波方位AVO的变化特征与裂缝走向和倾向的关系,尤其是具有一定倾斜角度的裂缝对地震波方位AVO的响应特征,为利用振幅变化信息预测裂缝提供了依据。将其应用于千米桥古潜山有利裂缝发育带的分析,取得了一些效果,促进了该方法在油气勘探中的应用。

AMPLITUDE VERSUS OFFSET CHARACTERISTICS OF AZIMUTH OF SEISMIC WAVE IN FRACTURED RESERVOIR

It is important to predict favorable fractured reservoir and its main azimuth of fracture during the exploration and exploitation of petroleum.The distribution of fractures will change the property of reservoir.The azimuthal change of seismic reflection amplitude is an important character.The amplitude versus offset (AVO) features of azimuth of seismic wave in anisotropic geological models with different distribution of fractures were analyzed.The relation between the AVO characteristics of seismic wave and the fracture strike and dip was built,especially for the tilt fracture,which provided the foundation to predict favorable fractured reservoir.The theory was also applied to analyze the favorable fractured zone of paleo buried hill in Qianmiqiao.The application result is of benefit to improve this method being used in petroleum exploration.