Application of Sweet Spot Prediction and Integrated Geological Modeling in the Shale Gas Reservoir of Zhaotong Block as a National Shale Gas Pilot Project

Unlike the successful development of shale gas basins in North America and other nearby domestic shale gas development zone, Huangjinba block have showed mountainous shale gas features of “strong transformation and over mature”, so the integrated geological and engineering study of reservoir quality, drilling quality, completion quality is quite necessary. Geophysical methods is the core technology followed by 3D geological modeling technology to perform on-site real-time feedback and iterative model updates in order to guide the geo-steering to ensure drilling ratio of high quality shale zone protect the integrity of well bores, and real-time monitor and adjust the parameters of the stimulation. By sweet spot identification technology with 3D seismic AVO inversion and ant-tracking, we could get shale gas reservoir propeties including TOC, gas content and porosity at all, predict the multiscale natural fractures and geomechanics elastic parameters. By 3D geological modeling technology, reservoir property models, multiscale fracture system model and geomechanics model were built and iteratively updated with Real-time new data from drilling, completion and logging. Then, we provided real-time supporting to well placement, drilling, and hydraulic fracturing, minimized the drilling risk, increased the drilling ratio of high quality gas shale zone, and increased the well performance.