敏感属性融合技术预测深部薄互层砂岩——以临南地区沙三下亚段河道砂体为例

Sensitive Attribute Fusion Technology to Predicct Deep Thin Interbedded Reservoir:A Case from Channel Sand Bodies in the Lower Sha-3 Member of Shahejie Formation in Linnan Area

深层河道砂体埋藏深,厚度小,地震反射特征弱,常规地震属性预测对深层薄储集层识别难度大。在地层对比划分和地震反射特征分析的基础上,通过正演模型,建立了河道砂体的地震响应特征,研究了面向目标的地震敏感属性,针对目的层段的地质目标分区域提取合理小时窗属性,再对不同区域不同小时窗属性进行聚类约束融合,从而对有利储集层进行精细刻画,形成了分级敏感属性融合方法,建立深层河道砂体储集层预测技术,指导了深层河道砂体勘探。

Deep channel sand body is characterized by deep burial,small thickness and weak seismic reflection,and it is difficult for con ventional seismic attribute prediction technology to identify deep thin reservoirs.Based on the stratigraphic classification and correlation and the seismic reflection analysis,the paper establishes the seismic response characteristics of the channel sand bodies by using a forward model,studies the attributes sensitive to seismic targets,extracts reasonable attributes of small time window for geological targets,then per forms clustering constrained fusion for these small time windows in different areas and conducts detailed characterization for favorable res ervoirs,develops a grading sensitive attribute fusion method and finally establishes a reservoir prediction technology for deep channel sand bodies,which can guide the exploration for deep channel sand bodies.