The 3-D Geological Models Study Of Tight Gas Sands Reservoir In West Canada Sedimentary Basin, Block B

The Block B tight gas sands reservoir is located in the western of West Canada Sedimentary Basin. The target reservoir is the Triassic Upper Montney formation, which is currently in the early stages of development. The tight gas sands reservoir in this region is characterized by complex mineralogical composition, poor physical properties, and poor response to single conventional well logging method. As tight gas sands reservoirs generally require hydraulic fracturing to be effectively developed, this thesis performs a comprehensive evaluation of well log data for Block B. The evaluation is done through a study of core, well drilling, as well as well logging data, through the sedimentary analysis, structural analysis, and well correlation. Interpretation models such as porosity, permeability, saturation, TOC, absorbed gas content, rock brittleness index, and horizontal principal stresses are established, which correlate to actual geological characteristics of the region of interest.First of all, the structural model of Upper Montney is established by using drilling well tops data. And the lithofacies model is established with the results of multi-mineral interpretation model. Through well logging interpretation data analysis of different layers and lithofacies, 3-D reservoir attribute models which contain porosity, permeability, saturation, TOC, absorbed gas content, rock brittleness index are completed.Summarizing results from core analysis, well logging interpretation, and 3-D geological models, five parameters of porosity, permeability, saturation, absorbed gas content, rock brittleness are classified into three classes of optimization standards. Lastly, through superposition analysis of the above five 3-D attribute models for each class, the favorable reservoir’s horizontal distribution of Block B is predicted, and target vertical layering in Upper Montney is confirmed. So as to providing necessary references for new well drilling and hydraulic fracturing in the region’s future development.