基于角弹性参数的多波地震储层预测方法

弹性参数作为反映岩石弹性性质的参数，在储层预测中具有重要作用.常规弹性参数的构建主要基于PP波地震信息.PP波与PS波地震振幅因其携带的信息不同，对岩性与流体的敏感性也不同.本文提出联合利用PP波与PS波弹性阻抗以及角度信息构建角弹性参数来预测有利储层.首先，对常规PS波弹性阻抗方程进行重新推导，使得PS波弹性阻抗取值的数量级不随角度变化且能够与PP波弹性阻抗具备形式上的匹配；其次，根据常规弹性参数构建公式，采用PP波弹性阻抗、PS波弹性阻抗替代纵波阻抗、横波阻抗，提出角弹性参数的概念及构建公式，从而将角度信息引入到弹性参数的构建中；最后，在PP波与PS波弹性阻抗反演的基础上构建得到对储层敏感性较强的角弹性参数，利用角弹性参数的取值特征预测有利储层.模型与实际资料测试均表明角弹性参数具备较高的储层敏感性.

Reservoir prediction of multi-component seismic data based on angle-elastic parameters

Elastic parameters represent the elastic properties of rocks and play an important role in reservoir prediction. The construction of conventional elastic parameters is mainly based on the information of PP wave seismic data. Due to the different amplitude information carried by PP and PS waves, the sensitivities of PP and PS wave seismic data to lithology and fluid are different. The comprehensive use of PP wave and PS wave information can reduce the multi-solution of reservoir prediction. This study investigates reservoir prediction by using PP and PS wave information jointly. Based on the previous research on PS wave elastic impedance, a new form of PS wave elastic impedance equation which can keep consistency with the PP wave elastic impedance equation is derived. According to the construction formula of conventional elastic parameters, we use PP and new PS wave elastic impedance instead of P and S wave impedance to construct a new kind of elastic parameters with the concept of angle-elastic parameters. Comparing with the conventional elastic parameters, the angle-elastic parameters have incidence angle and PS wave information and can be used as more sensitive indicators of reservoirs. Tests on both the model and real data show that the angle-elastic parameters have high sensitivity to beneficial zones of reservoirs.