多角度同步反演在南海西部气田开发中的应用

Application of Multi-angle Synchronous Inversion in the Gas Field Development in the West of South China Sea

在海上开发的油气田中,由于钻井数量,地震资料的应用在气田的管理中具有非常重要的作用,特别是在气田开发的中后期,常规的烃类检测技术和波阻抗反演技术已经无法解决储层物性横行变化的问题和剩余气分布的问题。通过采用多角度联合弹性反演技术获得的弹性参数来描述储层的物性变化和剩余油气分布,基本达到半定量的水平,为气田的下一步开发调整奠定了基础。研究表明,多角度同步弹性反演(AVA反演)得到的泊松比、纵横波组速度比可以定性识别含气储层和含水储层,利用纵横波组速度比与纵波波阻抗进行交会的办法可以半定量解释出气层的饱和度,反演结果可以用于未知目标的预测。

In offshore oil and gas field development,the number of wells drilled,the application of seismic data play an important role in gas field management,especially for the problems of lateral changes of reservoir physical properties and the distribution of remaining oil,which are hard to be solved by using conventional hydrocarbon detection and wave impendence inversion at the late stage of gas field development.The elastic parameters obtained with multi-angle and combined elastic inversion are used to describe the physical changes and the distribution of remaining oil,by which half-quantitative level is basically obtained and basis is provided for the next gas field development.Study shows that the Poisson's ratio,the vertical and horizontal wave velocity ratios achieved by multi-angle and synchronous inversion(AVA inversion) can be used to qualitatively recognize gas-bearing and water-bearing reservoirs.The methods of vertical and horizontal wave velocity ratios and vertical wave impedance can be deployed to quantitatively interpret the saturation of gas reservoirs and the inversion result can be used to predict the unknown targets.