基于正演模拟的曲流河构型层次研究

The AHP study of architecture pattern of meandering reservoir on the basis of forward simulation

在曲流河砂体沉积模式指导下,结合测井数据与地震资料的分析,采用正演模拟方法对大井距条件下的秦皇岛32-6油田明化镇组下段NmⅡ-4小层的曲流河砂体构型进行了层次分析.通过上述研究,明确了曲流河砂体构型边界的正演识别条件,建立了不同级次曲流河砂体构型边界的正演概念模型,总结了河道砂体顶面高程差异、天然堤沉积和废弃河道等曲流河砂体构型边界的波形特征,并指导地下实例区进行曲流河砂体构型解剖,最终实现了大井距条件下不同级次曲流河砂体构型边界的精细识别.研究结果表明:研究区目的层地震波主频介于55~60 Hz,应用正演模拟方法进行大井距间的曲流河构型层次研究,能有效提高大井距条件下单一曲流带和单一点坝砂体的识别精度.

Under the guidance of sedimentary modes of meandering reservoir,combined with analyses of logging data and seismic data,forward simulation and analytical hierarchy process(AHP)were applied to analyze the architecture pattern of meandering reservoir under large well spacing in the NmⅡ-4layer of lower segment of Minghuazhen formation in Qinhuangdao32-6oilfield.Identification conditions and conceptual model of architecture boundary in meandering reservoir of different order for forward simulation were confirmed.And elevation difference of channel sand bodies top surface and waveform characteristics of architecture boundary(natural levee deposit and the abandoned channel,et al.)were summarized.By guiding an underground instance of analyzing the architecture pattern of meandering reservoir,it is finely identified for architecture boundary in meandering reservoir of different order under large well spacing,finally.The results show that,the main frequency of seismic wave in target stratum is nearly 55-60 Hz,and the identification accuracy of both single meandering belt and single point bar sand body can be improved by using the forward simulation and analytical hierarchy process(AHP)for meandering reservoir under large well spacing.