论文详情
正交各向异性处理方法在各向异性特征明显的复杂裂缝地区的应用效果良好,但正交各向异性介质多参数建模方法尚不成熟。首先针对正交各向异性介质特性,通过分方位速度分析确定裂缝发育方向、提取方位各向异性参数,并采用融合公式建立正交各向异性参数初始模型;然后建立方位正交各向异性层析矩阵,制定先分方位、再联合的多参数反演策略;最后建立描述地震波速度方位特性的正交各向异性参数精细模型。三维模型数据试算和实际资料处理结果表明,所建立的模型参数分布合理,与真实地质情况吻合度高,有效改善了基于此模型的OVT域成像道集拉平效果,进而提升了断裂和缝洞储层成像效果,为准确预测断裂以及AVO精细分析提供了可靠的成果数据。
Orthotropic processing technology is being developed for complex fracture areas with obvious anisotropy; however,multi-parameter modeling technology for orthotropic media has not yet matured.This study seeks to improve the accuracy of fracture prediction via multi-parameter modeling.First,azimuth velocity analysis was used to determine the fracture development direction and extract the anisotropic parameters of the azimuth,and an initial model of orthotropic parameters was established with a fusion formula.From the initial model,an azimuth orthotropic tomographic matrix was established and a multi-parameter inversion strategy was developed.This strategy involved dividing the anisotropic data into different azimuths and then implementing a joint multi-parameter inversion.Thus,a fine orthotropic parameter model was established to describe the azimuth characteristics of seismic wave velocity.The 3D model test and field data processing results showed that the model parameter was reasonably distributed and depicted the true geology of the study site accurately.Based on this method,the OVT flattening of imaging gathers was improved,thereby enhancing fracture and fracture-cavity reservoir imaging to provide reliable results for accurate fracture prediction and amplitude versus offset analysis.
国家高技术研究发展计划(863计划)(2011AA060303)资助。