基于Gassmann方程的鲕滩储层流体替换模拟技术及其应用  

Fluid substitution simulation technology based on Gassmann's equa- tion for oolitic shoal reservoir and its application

作　　者：林凯[1] 贺振华[1] 熊晓军[1] 黄德济[1] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059

出　　处：《石油物探》2009年第5期493-498,17,共6页Geophysical Prospecting For Petroleum

基　　金：国家自然科学基金项目(40774064)资助

摘　　要：基于单井资料的储层地震响应模拟和流体识别大多采用褶积模型,但对于复杂地质模型,采用褶积模型模拟的波场动力学特征不明显。提出了基于Gassmann方程的流体替换波动方程模拟技术,从波动方程角度刻画了复杂鲕滩储层模型的地震响应。该方法利用Gassmann等效介质理论,对鲕滩储层实现由干岩石到有效孔隙饱和岩石的替换,由已知预测未知;之后通过建立鲕滩薄互层模型和薄互层楔形体模型,正演模拟了鲕滩储层含气后的地震响应,地震响应表现为"亮点"特征。Reservoir seismic response simulation and fluid identification techniques based on single-well information mostly adopts convolution model.However,for complex geological model,the kinetic characteristics of the wave field of the simulated results adopted convolution model were not obvious.Aiming at the problem,Gassmann equation based fluid substitution wave equation simulation technology was proposed,which described the seismic response of complex oolitic shoal reservoir model from wave equation aspect. The method uses Gassmann equivalent medium theory,realizes the fluid substitution of dry rock to effective pore saturated rock for oolitic shoal reservoir,predicts unknown from the known.Then,by establishing oolitic shoal thin interbedded model and wedge thin interbedded model,the seismic response of gas-bearing oolitic shoal reservoir was simulated by forward modeling,which showed'bright spot'characteristic.

关 键 词：鲕滩储层 Gassmann等效理论 流体替换 数值模拟 

分 类 号：P631.4[天文地球—地质矿产勘探]