纵、横波速度和密度重构算法在苏里格地区的应用

以苏里格气田为例,在分析目前广泛应用的重构算法假设基础上,应用了不依赖速度比假设的纵、横波速度和密度重构算法,通过采用不同角度的弹性阻抗数据交会分析来预测可能的流体分布或岩性分布.岩性变化或流体变化势必引起岩层纵、横波速度和密度的变化,因此可以通过其速度和密度变化研究流体或岩性分布.结果表明,改进算法的各种参数可以重建,但需要最大角度超过30°,而多角度的弹性阻抗反演为单纯利用纵波信息重构岩层的纵、横波速度(阻抗)和密度提供了可能.

Application of the reconstruction algorithms of the elastic impedance and density in Sulige Gasfield

Taking Sulige gasfield as an example,the reconstruction algorithms of p-wave and s-wave velocity and density that don ’t rely on the division of velocity are put forward based on the analysis of the widely used reconstruction algorithms at present.The possible fluid distribution or lithology distribution is predicted by using the crossplotting of elastic impedance data of different angles.The lithology and liquid variation will lead to the variation of p-wave and s-wave velocity and density,so the fluid distribution or lithology distribution can be studied by the variation of p-wave and s-wave velocity and density.The results of a case show that various parameters can be accurately reconstructed using improved algorithms only under the condition of maximum angle over 30°,and multi-angle elastic impedance inversion provides the possibility of merely using p-wave’s information to reconstruct the p-wave and s-wave velocity and density.