叠前流体指示因子反演在春光探区稠油层识别中的应用

Application of pre-stack fluid indicator factor inversion on identifying thick oil layers in Chunguang exploration area

春光探区东北部白垩系油藏类型主要为发育在不整合附近的稠油岩性油藏,常用的油气预测方法难以准确刻画油藏分布特征。为提高稠油层油气预测精度,形成了一种基于叠前流体指示因子反演的技术流程。首先对叠前地震资料进行优化处理,提高道集资料的信噪比和分辨率;然后在岩石物理分析的基础上,利用目标层流体性质与弹性属性的相关关系,构建流体指示因子属性;最后在叠前弹性参数反演的基础上,实现叠前流体指示因子反演,并根据稠油层特征优化反演参数,精细识别出稠油层的分布。该技术应用于春光探区东北部白垩系,预测结果与实钻井吻合度达到87.5%,取得了良好的应用效果。

The Cretaceous reservoirs in the northeast Chunguang exploration area are mainly heavy oil lithologic reservoirs developed near unconformity,and the commonly used oil and gas prediction methods are difficult to accurately characterize the reservoir distribution.In order to improve the prediction accuracy,a technical process based on the inversion of pre-stack fluid indicator factor is developed.Firstly,the pre-stack seismic data is optimized to improve the signal-to-noise ratio and resolution of the gather data.Secondly,based on rock physics analysis,the correlation between fluid properties and elastic properties of the target layer is utilized to construct fluid indicator factor attributes.Finally,according to the pre-stack synchronous inversion,the pre-stack fluid indicator factor inversion is achieved to finely characterize the distribution of heavy oil reservoirs.The technology has been applied to the Cretaceous reservoirs in the northeast Chunguang exploration area,and the consistency between the predicted results and the actual drilling can reach 87.5%,achieving good application results.