TTI介质各向异性参数优化提取方法

An optimized method for extracting anisotropic parameters in TTI media

对传统基于井震联合网格层析的TTI介质各向异性参数建模结果的分析发现,在地层厚度变化剧烈的情况下,反演得到的参数模型会出现畸变。为了避免这种不合理的现象,提出了一种优化的TTI各向异性参数反演方法,即通过基于各向异性参数δ的井震误差插值方法将地层厚度信息引入各向异性参数反演流程,使反演结果更加精确。实际资料处理结果表明,优化方法可以有效避免地层厚度突变带来的各向异性参数畸变问题,模型参数不受地层厚度变化的影响,因而比传统方法更为精确、合理。

When formation thickness varies greatly,the inverted parameter model derived by traditional anisotropic parameter modeling based on well-seismic joint grid tomography in TTI media can be distorted.To solve this problem,an optimized anisotropic parameter modeling method in TTI media was proposed in this paper.It introduces formation thickness information into anisotropic parameter inversion through theδ-based well-seismic error interpolation,and thus makes the inversion result more accurate.Real data processing results demonstrated that the optimized method can avoid the anisotropic parameter distortion caused by the abrupt change of formation thickness effectively,and the obtained model parameters are more accurate and reasonable for they are not related to formation thickness variation.