鲁棒性AVO三参数反演方法及不确定性分析

密度可用于推测流体饱和度,在储层预测中起至关重要作用。本文针对反演密度项造成的不适定问题和地震资料的带限特征,提出-种鲁棒性AVO三参数反演方法。该方法是通过在概率化AVO三参数反演目标函数中加入正则约束项,反演得到纵横波阻抗及密度参数,在提高反演结果稀疏性的同时,对反演结果低频分量进行补偿,保证结果的可靠性。文中还对反演结果进行了不确定性分析,验证了反演结果的可信程度。模型试算和实际资料测试结果均表明该方法具有可行性。

Robust three-term AVO inversion and uncertainty a-nalysis

As density can be used to estimate fluid satu-ration, it plays an important role in reservoir pre-diction.However，it is difficult to estimate accu-rate parameters due to the ill-conditioned nature ofinverse problems and the band-limited nature ofseismic data.In order to stabilize inversion and im-prove the reliability and sparsity of inversion re-cult，we add regularization terms to the objectivefunction of probabilistic three-term AVO inversionto estimate P-wave，S-wave impedance and densi-ty.Although the regularization strategy is ap-plied，uncertainty in parameter estimation still ex-1t5. ThUS，we apply uncertainty analysis to deter-mine if the estimation is desirable.At last，the al-gorithm is tested on synthetic data and seismic da-to.Both results show that the method is feasible.