Abstract：The target layer of the Huang 202 deep shale gas block in western Chongqing, with a burial depth of more than 3000m,has mainly been developed by horizontal wells. Fine “sweet spot” prediction and three-dimensional spatial determination of microstructures should be conducted as soon as possible to improve gas reservoir recovery,guarantee proper horizontal well placement, and ensure the box drilling rate of horizontal sections. Structural models reveal the geometric shapes and topological relationships of geological structures and thus serve as an important bridge for multidisciplinary communication and cooperation. However, the participation of horizontal wells puts forward hig-her requirements on 3D structural modeling technology. As the strata of the Longmaxi Formation, i.e., the target layer, is thin,structural modeling of the strata solely with seismic data and vertical well data is prone to cross-bedding and missing strata,which reduces the accuracy of the structural model. According to the characteristics of the study area,this paper pre-sents joint fine structural modeling of the target layer by employing the geosteering-based geological layering and comparison technology for horizontal wells, the construction and layered calculation technology for pseudo wells, integrating multiple information on the vertical section,the horizontal section, the pseudo well, and seismic data. Subsequent drilling for verification is highly consistent with the modeling results,representing a favorable prediction effect achieved by the proposed method.
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