Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (1): 117-122.doi: 10.3969/j.issn.1673-8926.2016.01.016

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A new model for calculating effective permeability in low permeability reservoir: A case study of low permeability marine sediments reservoir in the Pearl River Mouth Basin

Ma Yongxin 1，2， Lei Xiao2， Zhang Qiaoliang2， Meng Lingqiang2   

  1.  1. Faculty of Resources ， China University of Geosciences ， Wuhan 430074 ， China ；2. Zhanjiang Branch of CNOOC ， Zhanjiang 524057 ， Guangdong ， China
  • Online:2016-01-20 Published:2016-01-20

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Abstract:

Effective permeability is one of the key parameters affecting low permeability reservoir development. Its methods are usually influenced by production or test precision, and generally require a specific set of processes. To solve this problem, a research is made on how to calculate effective permeability by use of the easily obtained data. Accordingly, based on the principle of equivalent flow resistance, combined Darcy formula with Poiseuille formula, a new calculation model for calculating effective permeability in low permeability reservoir was established by considering water film and introducing the concept of the effective pore throat radius. The effective pore throat radius is the difference value between the original pore throat radius and the water film thickness. The sensitivity analysis shows that the pore throat radius has the same order of magnitude with water film thickness in low permeability reservoirs.Therefore, the water film has a great impact on the effective permeability. This new model was used to calculate the permeability of A4H1 well in Wenchang 13-1 oilfield in the Pearl River Mouth Basin, the South China Sea. The permeability calculated by the new model is similar to the result of well test analysis. It is shown that the new model is reliable and can provide foundation for productivity evaluation and dynamic analysis in low permeability reservoir,and it has a favorable application prospect.

Key words:  water flooding , displacement efficiency, recoveryefficiency, sweep efficiency , capillarypressure

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