ROCK MASS STRUCTURE CHARACTERISTICS AND 3D MODELING OF THE PINGDIQUAN FORMATION,NORTHEAST MARGIN OF THE JUNG-GAR BASIN
The laminas and natural fractures play a crucial role in controlling the hydraulic fracturing of shale res-ervoirs.Accurate characterization of the reservoir rock mass structure is essential for optimizing the stimulated reser-voir volume.This study focuses on the laminas and natural fractures of the Pingdiquan Formation hydrocarbon source rocks in the northeastern margin of the Junggar Basin,constructing a detailed three-dimensional geological structure model.Initially,we obtained high-resolution image data of the vertical profile of the Pingdiquan Formation hydrocarbon source rocks through close aerial photography by an unmanned aerial vehicle(UAV)and digital ima-ging.Subsequently,we constructed a high-precision three-dimensional digital model of the profile based on the im-age data to identify and interpret the natural fractures and laminar structures.Combining the parameters of natural fractures and laminas measured manually on-site,we determined three main sets of high-angle fractures through cluster analysis,with fracture length following a lognormal distribution.The average thickness of the laminas was about 0.57 m,with the overall lamina thickness following a negative exponential probability distribution.Based on the statistical characteristics of natural fractures and laminas,by utilizing Monte-Carlo simulation techniques,we constructed models for natural fractures and laminas,respectively.Finally,we overlaid these models to generate a three-dimensional rock mass structure model incorporating both natural fractures and laminas and verified by the measured profile.This study introduces UAV technology to acquire high-resolution image data of steep-profiled hy-drocarbon source rocks and interprets structural information on natural fractures and laminas,enhancing the refine-ment of rock mass structure characterization.The findings provide a more reliable three-dimensional model for nu-merical or physical simulations of the Pingdiquan Formation hydrocarbon source rocks in the Junggar Basin.
Junggar BasinPingdiquan FormationNatural fractureLaminaRock mass structure model
万方数据
维普
