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Investigation of Microscopic Pore Structure and Permeability Prediction in sand-conglomerate Reservoirs

Journal of Earth Science 2021年第4期32卷 818-827页

作者： You Zhou Songtao Wu Zhiping Li Rukai Zhu Shuyun Xie Xiufen Zhai Lei Lei Research Institute of Petroleum Exploration and Development CNPCBeijing 100083China Key Laboratory of Oil and Gas Reservoirs CNPCBeijing 100083China National Energy Tight Oil and Gas R&D Center Beijing 100083China School of Civil Engineering Hebei University of EngineeringHandan 056000China School of Energy Resource China University of GeosciencesBeijing 100083China School of Earth Sciences China University of GeosciencesWuhan 430074China

The microscopic pore structure of sand-conglomerate rocks plays a decisive role in its exploration and development of such *** to complex gravels-cements configurations and resultant high heterogeneity in sand-conglomerate rocks,the conventional fractal dimensions are inadequate to fully characterize the pore *** on the Pia Intermingled Fractal Units(IFU)model,this paper presents a new variable-ratio factor IFU model,which takes tortuosity and boundary layer thickness into consideration,to characterize the Triassic Karamay Formation conglomerate reservoirs in the Mahu region of the Junggar Basin,Northwest *** modified model has a more powerful and flexible ability to simulate pore structures of porous media,and the simulation results are closer to the real conditions of pore space in low-porosity and low-permeability reservoirs than the conventional Pia IFU *** geometric construction of the model is simplified to allow for an easing of *** and spectral distribution of pore diameter,constructed using the modified model,are generally consistent with actual core ***,the model-computed permeability correlates well with experimental results,with a relative error of less than 15%.The modified IFU model performs well in quantitatively characterizing the heterogeneity of sand-conglomerate pore structures,and provides a methodology for the study of other similar types of heterogeneous reservoirs.

关键词： sand-conglomerate intermingled fractal units pore structure quantitative characterization permeability

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