Abstract
Background: Three-dimensional geological modeling of reservoirs is not only the key factor for reservoir description and prediction of oil reserves but also an important means of quantitative characterization of reservoir geometry and heterogeneity in three dimensional spaces. The aim of this paper is to establish prediction model for sandstone classification and reservoir petrophysical properties. Methods: Sand body prediction model was built by using stochastic simulation of discrete variables. Gauss model and sequential Gauss simulation method were selected to build porosity, permeability and oil saturation models. Results: The Chang 812 layer includes three sedimentary microfacies: distributary channel, inter-distributary bay and swamp. The dominant thickness of Chang 812 layer ranges from 15 to 20m. Three other classes of thickness (5-10 m, 10-15 m and 0-5 m) are subsequently less present. The major porosity of Chang 812 layer ranges from 5 to 15%, the major permeability ranges from 0.1 to 2×10-3μm2 and the major oil saturation ranges from 55 to 70%. Conclusion: The Chang 812 layer of Triassic Yanchang Formation mainly formed in braided delta plain depositional environment. The truncated Gauss simulation of sand body was applied in simulation. The thickness of the sand body is relatively greater than the porosity, permeability and oil saturation values.
Highlights
Three-dimensional geological modeling of reservoirs is the key factor for reservoir description and prediction of oil reserves and an important means of quantitative characterization of reservoir geometry and heterogeneity in three-dimensional space, its core is to predict volumetric distribution of reservoir parameters [1 - 4]
To analyze the distribution of sand body in current area, this study using core, log, and geologic data, established the sandstone classification prediction model, reservoir properties prediction model of porosity, permeability and oil saturation based on the analysis of sedimentary microfacies and the classification statistics method of development well sand body thickness of Yanchang Formation Chang 812 layer in Honghe 36 well area, Ordos Basin, China, in order to provide reference model for oil reserves prediction in the study area and development of reservoir parameter modeling on similar areas
Core analysis data from HH49 and HH105 well include porosity, permeability and oil saturation, the measurements obtained interval of HH49 well ranges from 2249 to 2262 meters and HH105 ranges from 2270 to 2283meters in Chang812 reservoir formations, these data are provided by Sinopec, Huabei Oilfield
Summary
Three-dimensional geological modeling of reservoirs is the key factor for reservoir description and prediction of oil reserves and an important means of quantitative characterization of reservoir geometry and heterogeneity in three dimensional spaces. The aim of this paper is to establish prediction model for sandstone classification and reservoir petrophysical properties
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