Abstract
Core samples of the tight sandstone reservoir in the Bonan Oilfield were analyzed by using multiple petrophysical experimental techniques, then a multi-scale three-dimensional digital rock model was constructed. The pore structure parameters of tight sandstone and homogeneous Berea sandstone were compared. The electrical simulation method based on the digital rock model was utilized to quantitatively reveal the influence of five micro-pore structure parameters (pore size, throat size, pore-throat size, coordination number, and shape factor) on the rock’s electrical properties. In addition, the saturation of tight sandstone reservoirs was evaluated in combination with the three-component automatic mixed-connection conductivity model. The results show that the “non-Archie” phenomenon in sandstone is obvious, which is mainly caused by the small radius of the maximum connected pore throat and the complex structure of the pore throat. We noted that: with an increase in pore radius, throat radius, and coordination number, the formation factor decreases and tends to be stable; the pore-throat size increases and the formation factor decreases in the form of power function; the shape factor increases, and the formation factor increases; the larger the pore–throat ratio and shape factor, the greater the resistivity index; with an increase in coordination number, the resistivity index decreases; and the pore-throat size has no effect on the resistivity index. The calculation accuracy of oil saturation is improved by 6.54% by constructing the three-component automatic mixed-conductivity saturation model of tight sandstone.
Funder
National Natural Science Foundation of China
the National Science and Technology Major Project
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
Reference58 articles.
1. Enrichment of tight oil and its controlling factors in central and western China;Song;Pet. Explor. Dev.,2021
2. Theory, technology and prospects of conventional and unconventional natural gas;Zou;Pet. Explor. Dev.,2018
3. Sealing mechanisms in volcanic faulted reservoirs in Xujiaweizi extension, Northern Songliao Basin, Northeastern China;Liu;AAPG Bull.,2021
4. Characterization of tight gas reservoir pore structure using USANS/SANS and gas adsorption analysis;Clarkson;Fuel,2012
5. Reservoir spaces in tight sandstones: Classification, fractal characters, and heterogeneity;Huang;J. Nat. Gas Sci. Eng.,2017
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献