远源砂质辫状河储集层内部隔夹层研究与地质建模——以沾化凹陷孤东油田六区馆上段为例

河流相储层内部隔夹层研究对其储层内部构型表征及剩余油挖潜具有重要指导作用。本文以沾化凹陷孤东油田六区为例，基于岩心、测井资料，对远源砂质辫状河的单井、连井以及平面发育特征进行了分析；基于沉积微相控制和岩心、测井标定，对不同层次的隔夹层进行了识别以及特征描述；基于密井网的约束对心滩内部夹层的规模与产状进行了表征。结果表明：单层间夹层多是物性夹层，单砂体之间夹层包括泥质夹层与泥砾夹层，增生体之间的夹层为落淤层，落淤层宽度为80~400 m，长度为350~1 630 m，落淤层在滩头倾角约为2.03°，在滩尾倾角为1.28°，在两翼倾角为1.58°。利用界面约束方法，对储层内部夹层进行了构型建模，建立了一套能够进一步深度表征辫状河内部非均质性的构型模型。

Research and Modeling of Interlayers in Distal Sandy Braided River Reservoir: A Case Study of Upper Guantao Formation,Block 6 in Gudong Oilfield,Zhanhua Sag

The study on interlayers in fluvial reservoir plays an important guiding role in the reservoir architecture characterization and remaining oil development. Taking the block 6 of Gudong oilfield in Zhanhua sag as an example, the single well, profile,and plane characteristics of the distal braided river were analyzed by using core and wire logging. In order to analyze the interlayer patterns in the braided fluvial reservoirs, the interlayer characteristics in different hierarchical structures were identified by control of the microfacies and calibration of the well and core. The interlayer between single layers is physical, the interlayer between single sand bodies is physical or boulder clay, and the interlayer between the accretion bodies is silty mudstone. The silty interlayer in the braided bar is 80-400 m wide and 350-1 630 m long, and its inclinations at the bar head is about 2.03°, at the bar tail is about 1.28°, and at the wings is about 1.58°. Based on the constraints of the well network, the geometric parameters and occurrences of the interlayers in the braid bar were characterized, and the architectural model was built by the method of interface constraint, which can further characterize the heterogeneity of braided fluvial reservoir.