渤海蓬莱19-3油田新近系明下段曲流河储层构型表征

Architecture characterization of meandering river reservoirs of lower Minghuazhen Formation of Neogene in Penglai 19-3 oilfield,Bohai Sea

开展复合砂体内部不同级次储层构型单元的精细表征对渤海蓬莱19-3油田明下段开发方案的优化至关重要。综合应用岩心、测井和三维地震资料,并进行多地震属性的智能融合,实现了对蓬莱19-3油田三区明下段Ⅳ油组2小层曲流河储层五—三级构型单元的精细刻画。研究结果表明:(1)蓬莱19-3油田目的层段可划分为单一曲流带、单一点坝砂体和单一侧积体不同级次储层构型单元。(2)地震属性中的最大振幅、反射强度和相对波阻抗对储层响应较为敏感,基于物性参数监督的神经网络多属性融合进一步提高了储层预测的精度和可信度。(3)研究区发育南北向展布、中间窄两端宽的单一曲流带五级构型单元;单一点坝四级构型单元呈串珠状分布且互相切割改造;单一点坝内部侧积体呈正韵律,侧积层倾角为2°~5°。(4)采用多属性智能融合技术对研究区曲流河多级次构型单元进行刻画的结果显示,不同成因类型构型单元的几何形态、规模及其结构存在相关性,对调整井位、完善注采井网、提高油田开发效率具有重要意义。

It is important to carry out fine characterization of different levels of reservoir architecture units in the composite sand bodies for the optimization of the development plan of the lower Minghuazhen Formation in Penglai 19-3 oilfield in Bohai Sea.The cores,logging and 3D seismic data were used to characterize fifth to thirdorder architecture units based on multi-attribute intelligent fusion in the second sublayer of Ⅳ oil group of lower Minghuazhen Formation in the third region of Penglai 19-3 oilfield.The results show that:(1)It can be divided into different levels of reservoir architecture units such as single meander belts,single point bar sand body and single lateral deposit in Penglai 19-3 oilfield.(2)Through the optimization of seismic attributes,the maximum amplitude,reflection intensity and relative impedance are more sensitive to reservoir response.The neural network multi-attribute fusion based on parameter supervision further improves the accuracy and reliability of reservoir prediction.(3)A single meander belt with fifth-order configuration unit is developed in the study area,which is narrow in the middle and wide at both ends in the north-south direction.The fourth-order architecture unit of single point bar is distributed in a string of beads,and the point bars are cut and transformed with each other.The lateral deposit is positive rhythm,and the dip angle of the lateral deposit is 2°-5°.(4)The geometric shape,scale and structure of the configuration units of different genetic types are relevant,which is of great significance for adjusting the well location,improving the injection-production well pattern and improving the efficiency of oilfield development.