陆相地层渗透性砂层预测方法

A prediction method for permeable sand bed in land facies formations

利用叠后地震数据反演来估算地层的波阻抗，进而估算地层物性参数（密度、孔隙率、泥质含量），这一直是地质学家追求的目标。本文介绍一种CCFY波阻抗反演技术，该技术具有纵、横向分辨率高，解的确定性较好，可反演多种参数（密度、速度、孔隙率）剖面等优点。利用该技术较有效地解决了陕甘宁盆地某地区三叠系长6油组渗透性砂岩识别的难题，其预测地层厚度的符合率达75％以上，为油田开发井位的布置提供了很有用的参考资料。

Post-stack seismic data inversion is conducted to estimate the wave impedance o f formation then to calculate geophysical parameters (density, porosity and shale content), which is the purpose of geologists. CCFY wave impedance inversion technique is recommended here. This technique results in high resolution in vertical and lateral directions, stable solution, multiple parameter sections (density, velocity and porosity). This technique has been used to solve a tough problem of ascertaining a permeable sand bed of Chang-6 reservoir group in Triassic system in Shanganning basin. Coincidence of predicted bed thickness is higher than 75%. It can offer very useful data for borehole-site design in oil field development.