Investigation of Microscopic Pore Structure and Permeability Prediction in Sand-Conglomerate Reservoirs  

作　　者：You Zhou Songtao Wu Zhiping Li Rukai Zhu Shuyun Xie Xiufen Zhai Lei Lei 

机构地区：[1]Research Institute of Petroleum Exploration and Development,CNPC,Beijing 100083,China [2]Key Laboratory of Oil and Gas Reservoirs,CNPC,Beijing 100083,China [3]National Energy Tight Oil and Gas R&D Center,Beijing 100083,China [4]School of Civil Engineering,Hebei University of Engineering,Handan 056000,China [5]School of Energy Resource,China University of Geosciences,Beijing 100083,China [6]School of Earth Sciences,China University of Geosciences,Wuhan 430074,China

出　　处：《Journal of Earth Science》2021年第4期818-827,共10页地球科学学刊（英文版）

基　　金：supported by the National Key Basic Research and Development Program(973 Program)of China(No.2014CB239000);the China National Science and Technology Major Projects(No.2017ZX05001);the Petrochina Science and Technology Major Projects(No.2016B-0304).

摘　　要：The microscopic pore structure of sand-conglomerate rocks plays a decisive role in its exploration and development of such reservoirs.Due to complex gravels-cements configurations and resultant high heterogeneity in sand-conglomerate rocks,the conventional fractal dimensions are inadequate to fully characterize the pore space.Based 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 China.The 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 model.The geometric construction of the model is simplified to allow for an easing of computation.Porosity and spectral distribution of pore diameter,constructed using the modified model,are generally consistent with actual core data.Also,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 

分 类 号：P618.13[天文地球—矿床学] TE311[天文地球—地质学]