摘要
采用基于层状模型和动态射线追踪的先验约束最大似然反演过程，求解叠前地震道集储层时窗内各个时间采样点的纵、横波速度和密度等弹性参数，并由此计算泊松比参数．用解析算式计算Ｊａｃｏｂｉ矩阵中反射和透射系数关于模型参数的偏导数，并用自适应因子控制约束反演过程，使得迭代计算快速和稳定．由于在反演中加上了先验地质信息的约束，提高了参数估算的分辨率和抗噪音能力，并且可以获得符合地质规律的反演结果．理论模型和一组三维地震面无道集的反演结果表明，这种方法可以应用于面向储层的叠前地震资料弹性参数反演．
An approach of non-linear AVO inversion constrained by a priori geological information is presented in this paper.The elastic parameters including P-wave velocity,S-wave velocity and density of every time sampling point in the reservoir window on prestack seismic gatherare esti mated by the prior-constrained maximum-likelihood inversion based on layered model and dynamic ray tracing,and the parameters of poisson's ratio are also derived.The differentials of reflection and transmission cofficients respect to model parameters are calculated analytically,and the inversion procedure is controlled by adaptive factors,which make the iterative computation speed and stable.Since the inversion is constrained by a priori geological information,the resolution of parameter estimates and the robustness to noise interference are improved,and the inversion results according with the geologlcal regularities can be obtaine.The approach is tested on a synthetic model and a group of 3D seismic bin gathers.The results show that the approach can be used to perform the reservoir-oriented inversion on prestack seismic data for estimating elastic parameters.
出处
《地球物理学报》
SCIE
EI
CSCD
北大核心
1994年第A02期467-476,共10页
Chinese Journal of Geophysics
基金
国家"八五"科技攻关项目
关键词
油气勘探
地震勘探
AVO反演
地质信息
先验约束
AVO inversion
Elastic parameter
A priori-constraint
Adaptive control
Maximum-likelihood inversion.
