基于超定方程的多角度岩石物性参数提取方法

Extraction Method of Multi-angle Rock Physical Parameters Based on Overdetermined Equation

常用的岩性参数提取方法是从3个不同角度叠前弹性阻抗反演的弹性阻抗剖面提取得到的,从数学角度而言,这属于适定问题的求解过程。为更好地利用叠前资料的丰富信息,提高反演结果的准确性和稳定性,将叠前地震数据进一步细化,开展多个角度弹性阻抗超定方程的求解,从而获得地层速度、密度、纵横波阻抗、泊松比等丰富多样的岩性参数信息,这将有利于储层的精细描述及储层预测,能更可靠地揭示地下储层物性的展布情况。利用该方法对不同地区的实际资料进行了应用,取得了良好的应用效果。

Common extraction method of lithologic parameters was gained from three different angles of elastic-impendence profiles of prestack elastic impedance inversion,which belonged to solving process of the well-posed problem from a mathematical point of view.In order to make better use of the abundant information of prestack seismic data,improve the inversion accuracy and stability,the prestack seismic data were further refined and multi-angle elastic impedance overdetermined equations were solved.At the same time,variety of lithologic parameter information,such as stratum velocity,density,P-wave and S-wave impedances,Poissons ratio were obtained,which were favorable for fine description and prediction of reservoirs for more reliably revealing the distribution of the reservoir physical property.The method is used for processing the data from different areas,and good effects are obtained.