[Purpose] Sandstone reservoirs under the influence of igneous rocks have become some of the most important complex reservoirs. The accurate description of the distribution for this type of reservoir is a major technical problem in hydrocarbon exploration and development. Geological modeling is the fundamental work of reservoir research. However, there is relatively little research on the reservoir modeling of sandstone reservoirs under the influence of igneous rocks. [Method] In this study, taking the Bohai X oilfield as the research object, the distribution characteristics of sandstone reservoirs were characterized, and a quantitative identification method for igneous rocks was established based on seismic, logging, and drilling data. The impact of igneous rocks on sandstone reservoirs was analyzed, and a structural model under a sequence stratigraphic framework was constructed. And then, a three-dimensional geological model of sandstone reservoirs under the influence of igneous rocks was established. [Results] The results show that the physical properties of sandstone reservoirs deteriorate due to the extrusive igneous rocks in the zone with a complex fracture system and the area that volcanic channel developed. After that, referring to the identification and modeling methods of salt domes and using the fine identification and tracking results of volcanic rocks, the volcanic rocks are extracted as attribute bodies, which are finally nested into the geological model. At the same time, according to the influence degree of igneous rocks, a three-dimensional (3D) model was established, which can not only characterize the structure of igneous rocks but also reflect the development of reservoirs. [Conclusions] The research results can better guide the implementation of development wells, avoid reservoir risks, and significantly improve the accuracy of numerical simulation.