摘要
AVA(Amplitude Versus Angle)技术是基于常规介质模型(均匀各向同性介质模型)发展起来的,由于忽略了储层的孔隙结构和充填流体的影响,造成AVA特征中是部分对地震波能量的吸收和衰减作用反映不足。从振幅特征方程的实际应用出发,建立起各参数与常规岩性参数之间的关系。以Gassmann方程与Biot理论为基础,推导出振幅特征方程中弹性参数与常规岩性、储层参数(如:纵波速度、横波速度、密度、孔隙度、流体参数Kf)之间的转化关系式,详细研究饱和流体多孔介质模型中的AVA特征,比较该介质模型与常规介质模型在AVA特征上的差异,并将饱和流体多孔介质AVA技术应用于川西凹陷深层须家河组储层预测,通过多波AVA储层参数的反演研究,为直接利用地震资料进行储层识别并进一步识别其流体特征提供了一种有力手段。
On the basis of Gassmann formula and Biot theory, the elastic parameters of the AVA formula and transformation relation of common lithological parameters of 2-phase medium were established. The AVA curve of model interface of different 2-phase mediums was calculated by using the transformation relation of parameters. It was showed that the calculated results were correct and the effect of lithology and parameters on the AVA was sensitive. It was also proved that this study is of significant in the analysis of AVA and inversion of strata and reservoir parameters
出处
《矿物岩石》
CAS
CSCD
北大核心
2008年第2期88-94,共7页
Mineralogy and Petrology
基金
教育部博士点基金(20070616004)
中石油物探重点实验室开放基金(GBKL0803)
