作　　者： ; (陈国民）;

机构地区： 中国海洋石油国际有限公司北京100028

出　　处： 《当代化工研究》 2023年第19期1-4,共4页

摘　　要： S油田采用先进OBN时移地震技术进行油田管理,但目前面临时移地震差异解释困难这一难题,主要原因之一是储层开采引起流体替换和储层压力变化对地震波速度的影响研究不深入。针对S油田在地震波速度方面认识不足问题,通过以Gassmann方程为基础的理论来开展地震波速度随不同储层参数变化的研究,得出三点有关纵波速度变化规律性认识:(1)泥质含量会对速度变化产生影响,在高孔隙度时,泥质含量越大,这一现象越明显;(2)泥质含量对储层压力改变和流体替换对速度变化的敏感性存在差异,泥质含量变化对流体替换引起的速度变化更加敏感;(3)在相同孔隙度情况下,泥质砂岩储层比纯砂岩储层引起的速度变化更大,对时移地震监测更为有利。 The advanced OBN time-shift seismic technology is used for oilfield management in S oilfield,but it is difficult to explain time-lapse seismic differences.One of the main reasons is that the influence of fluid replacementn and reservoir pressure changes on seismic P-wave velocity caused by reservoir development is not deeply researched.In view of the lack of understanding of seismic wave velocity in S oilfield,the theory based on Gassmann equation is used to research the variation of P-wave velocity with different reservoir parameters,and three regular understandings about P-wave velocity change are obtained:(1)The variation of velocity is influenced by the content of mud.The larger the content of mud is at high porosity,the more obvious this phenomenon is.(2)There are differences in mud content sensitivity to reservoir pressure change and fluid replacement sensitivity to velocity variation,and mud content change is more sensitive to the velocity variation caused by fluid replacement;(3)Under the same porosity situation,the velocity variation of muddy sandstone reservoir is greater than that of pure sandstone reservoir,which is more favorable for time-lapse seismic monitoring.

关 键 词： 时移地震 纵波速度 流体替换 储层压力

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