Discussion on defining standards of permeability of tight oil reservoirs

doi:10.3969/j.issn.1672-7703.2018.05.007

Abstract

Abstract: In recent years, the rapid growth of tight oil production in the United States has attracted extensive attention all over the world, but the evaluation standard of the permeability of tight oil hasn't been unified at home and abroad. Based on the analysis of reservoir productivity, relative core permeability, core displacement pressure and the relationship between core porosity and permeability, and considering applicable standard and the relationship between overburden permeability and ground permeability, it is suggested that 1mD ground permeability can be the critical value to distinguish tight oil reservoir from conventional reservoir, differences between tight oil reservoir and conventional ultralow-permeability reservoir are analyzed in pore space, porosity-permeability relationship and irreducible water saturation, and finally two auxiliary characterization methods for tight oil reservoirs are proposed:one is seepage rate and the other is pore throat radius.

Key words: tight oil, reservoir, permeability, seepage rate, pore throat radius

CLC Number:

Bi Haibin, Duan Xiaowen, Yang Zhaolin, Li Shuxun, Yao Aihua, Qi Yue, Zheng Jing, Gao Rili, Liang Kun, Zhou Mingqing, Meng Hao. Discussion on defining standards of permeability of tight oil reservoirs[J]. China Petroleum Exploration, 2018, 23(5): 57-64.

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