3D geological modeling is essential at every stage of oilfield exploration and development. The scale

precision

and requirements of modeling vary depending on the issues at hand. While zonal block geological modeling guides well location deployment and the analysis of well group development and adjustments

the absence of a unified standard for each independent block model hinders the integration of smaller models into larger ones. This limitation affects the overall exploration

development

and planning of the oilfield. To maximize the precision

and guiding role of geological modeling throughout the entire lifecycle of an oilfield

this paper uses an integrated oilfield

Gudao Oilfield

in Bohaiwan Basin as a case study. It introduces a multi-stage modeling strategy that progresses from a monolithic oilfield to zonal blocks and finally to reservoir configurations（single sand bodies）. These approach using geological modeling software

Direct and M

3

with independent intellectual property rights and applying geostatistics and embedded reservoir configuration modeling with geological constraints to realize the transformation from macro to micro

whole to local

and general to detailed

providing an in-depth description of the oilfield’s structural and depositional characteristics

reservoir configurations

and spatial distribution of oil reservoirs. The 3D geological large-scale model and hierarchical model of the first multi-billion grid nodes of the oilfield in China are built. Such detailed modeling aids in deepening geological understanding

evaluating the potential of developed oil reservoirs

and locating remaining reserves

thereby ensuring the oilfield’s sustained and stable production. 3D geological multi-stage modeling technology not only facilitates multidisciplinary communication among petroleum professionals but also serves as a robust foundation for digital oilfield management. It represents an inevitable trend towards the development of digital and intelligent oilfields and offers significant guidance for oilfield exploration and development.