Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (1): 72-76.doi: 10.3969/j.issn.1673-8926.2016.01.009

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Fractal characterization of casting thin sections ： A case study from Kunbei area in Qaidam Basin

Chen Gengxin 1,2,Liu Yingru 1,2,Guo Ning 3,Wang Aiping 1,2,Chang Haiyan 1,2,Zhang Tingjing 1,2   

  1.  1. PetroChina Research Institute of Petroleum Exploration & Development - Northwest ， Lanzhou 730020 ， China ； 2. Key Laboratory of Reservoir Description ， CNPC ， Lanzhou 730020 ， China 3. Research Institute of Exploration and Development ， PetroChina Qinghai Oilfield Company ， Dunhuang 736202 ， Gansu ， China
  • Online:2016-01-20 Published:2016-01-20

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Abstract:

The conventional analysis of pore structure of casting thin sections is mainly limited to qualitative description of the picture. Effective information of pore structure can be obtained by using the image processing technology to calculate the fractal dimensions of pores. The quantitative relations of the fractal dimensions with porosity, sedimentary microfacies and productivity index were established. The fractal dimensions represent porosity and sorting features synthetically. The larger the porosity is, the better the sorting and connectivity are, and the larger the fractal dimension will be. In the Qie 6 reservoir in Kunbei area of Qaidam Basin, the fractal dimension limit between distributary channel and river mouth bar is 1.83, which can be used to distinguish microfacies. The fractal dimension has a quantificational positive-correlation with productivity index, so it can be used to predict the productivity index. By the fractal mathematics method, the semi-quantitative characterization of the pore structure of casting thin sections can be realized.

Key words: Tongxu Uplift , lithologic traps , tight sandstone gas , exploration prospects , Tongxu area , southern North China Basin

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