基于地震波衰减的特征属性重构方法

以储层流体识别为目的,提出了基于地震波衰减的特征属性重构方法。首先从地震波衰减理论出发,通过改变地层品质因子表达式,推导了地震特征属性函数,利用振幅类、频率类及衰减属性重构新的地震属性;然后设计粘弹性介质模型进行试算,结果表明,利用特征属性函数重构的地震属性能较好地突出储层含流体变化特征,从而验证了基于地震波衰减的特征属性重构方法识别储层含油气性的有效性。将该方法应用于老河口油田北部老168井区河道砂岩储层油气识别,基于叠后地震资料精细刻画了储层流体的展布特征,取得了较好的应用效果。

Method of characteristics attributes reconstruction based on seismic wave attenuation

According to apparent absorption and attenuation characteristics of the hydrocarbon-bearing reservoir,a characteristic attribute reconstructing method based on seismic wave attenuation has been developed to identify the reservoir fluids.The seismic absorption and attenuation theory is the foundation of this method.A seismic characteristic attribute function has been deduced by changing the strata quality factor expression.According to this function,we reconstruct new seismic attributes by using the common seismic attributes of amplitude class,frequency class and absorption & attenuation class.Based on the designed viscoelastic medium model,the examine result shows that the new attributes can emphasize the changing characteristics of reservoirs fluid-bearing and verify the new method.Applied the technique to Lao168 well block to identify the reservoir hydrocarbon-bearing of channel sandstone,we achieved a good result that the distribution of the fluid was accurately depicted.