LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (1): 74-80.doi: 10.3969/j.issn.1673-8926.2015.01.011

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Evaluation and optimization of flow unit division methods

  LU Mingzhen1， LIN Chengyan1， ZHANG Xianguo1， ZHANG Jiangtao2   

  1.  1. School of Geosciences ， China University of Petroleum ， Qingdao 266580 ， Shandong ， China ；2. Tianjin Company ， CNOOC ， Tianjin 300452 ， China
  • Online:2015-02-03 Published:2015-02-03

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Abstract:

 Research on flow units is significant for the studies of reservoir heterogeneity and remaining oil distribution, as well as improving accuracy of well log interpretation models. Methods of flow unit identification are various, and their applicability is also different. Taking W oilfield in the Pearl River Mouth Basin as an example, this paper respectively used four methods to identify flow units, including modified stratigraphic Lorenz plot, flow zone indicator, integrated index of reservoir heterogeneity and pore throat aperture. Both modified stratigraphic Lorenz plot method and flow zone indicator method are based on permeability and porosity ratio, so it is difficult to identify tight reservoir. Pore throat aperture method can be used to identify tight reservoir, but it is difficult to differentiate high quality reservoir and meticulous to divide low quality reservoirs. Integrated index of reservoir heterogeneity synthesizes various qualitative and quantitative parameters, it divides tight reservoir as a separate kind of flow unit which can be effectively distinguished from other oil layer, and the division result can reflect reservoir heterogeneity reasonably, so it is the best method for flow unit division in the study area.

Key words:  effective source rocks, hydrocarbon expulsion characteristics, lowest limit of TOC content, gentle slope belt, Chagan Depression

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