Integrated Shale Gas Reservoir Modeling and The Application in Drilling and Completion

Changning shale gas block is in the south margin of Sichuan basin. The development is challenging because the block is featured with complex structure, nature fractures and in-situ stress.High quality reservoir characterization integrating multidisciplinary data is preferred to minimize drilling and completion risks. In this study, we present the integrated 3D reservoir modeling workflow characterizes structural, property and natural fracture features by seamless integration of seismic data, vertical and horizontal well petrophysical data, drilling and completion data. The integrated model mainly helped drilling and completion in three aspects. Firstly, combing structural interpretation and horizontal wells, the structural model's accuracy has been continuously increased, andit helped well trajectory design and geosteering. Secondly, properties model built from seismic inversion and paraphysics data such as Total Organic Carbon (TOC), porosity and Gas in Place (GIP)was characterized, the identified sweet spot is the potential area for pad deployment. Thirdly, natural fractures predicted by ant tracking were verified by microseismic data, drilling and completion was accordingly optimized to avoid risks caused by natural fractures.