Abstract: Geology-engineering integration emphasizes the interaction between geological research and engineering operations. In China, the geological conditions of unconventional oil and gas fields are complex. As a result, geological modeling faces unique challenges in terms of data foundation and application requirements. On the one hand, the data are mainly from horizontal wells, so data volumes are large and data types are miscellaneous. On the other hand, geological models are required to iterate rapidly, or even perform “timely” modeling during operational processes. Therefore, it is critical to make full use of the various data to quickly establish high-quality geological models. This paper focuses on the unique nature of unconventional reservoir modeling, taking shale gas reservoirs as an example, and proposes specific workflows and methods. First, the geological modeling workflow of horizontal wells is systematically described. Through cycle correlation in true thickness domain and 2D geo-steering section and integration of seismic and well data, the difficulties of structure and attribute modeling of horizontal wells have been solved from one- to three-dimensions. Second, taking ant tracking technology as an example, natural fracture prediction and modeling methods are summarized. Fractures are widely developed in unconventional reservoirs. Based on understandings of the geological settings of fracture development, cross-validation from multidisciplinary data, such as FMI logging, drilling and micro-seismic data, is helpful in achieving reasonable fracture modeling. Third, geological modeling workflows and their application under different requirements are described, such as well deployment optimization, timely modeling to support geo-steering and fracturing operations by multi-disciplinary integration.