Mercury injection fractal characteristics and reservoir evaluation of heterogeneous sandstone reservoirs

被引：0
|
作者：
Feng Z. [1 ]
Zhou Y. [2 ]
Wu W. [2 ]
Wang G. [2 ]
Liang S. [3 ]
Yu J. [1 ]
机构：
[1] College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo
[2] Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo
[3] Dongsheng Petroleum Development Group Company Limited of Shengli Oilfield, Dongying
来源：
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2021年 / 45卷 / 06期
关键词：
Baiyun Sag; Comprehensive fractal dimension; Fractal model; Mercury injection curve; Reservoir evaluation;
D O I：
10.3969/j.issn.1673-5005.2021.06.003
中图分类号：
学科分类号：
摘要：
By processing the mercury injection curve, the fractal geometry method and corresponding fractal dimension value can be used as a quantitative parameter to evaluate the physical properties of the reservoir. In previous studies, the fractal model was often calculated in two sections, but the corresponding geological meaning was unclear. In addition, the pore and permeability characteristics of rocks could not be expressed as a whole. In some studies, the concept of comprehensive fractal dimension has been applied, but the calculating weighted value lacks their theoretical support. An improved comprehensive fractal model is proposed. The new model was applied to process the mercury injection data of group 15 samples in Baiyun Sag of the Pearl River Mouth Basin. Combined with physical parameters such as porosity and permeability, the geological implications and influences of fractal dimension were analyzed. The results show that: the goodness of fit between mercury saturation and capillary pressure is generally greater than 0.85 in the logarithmic coordinate system, and the curve has fractal characteristics. The fractal dimension D1 represents the degree of homogeneity of large pores, which is not directly related to reservoir physical properties. The fractal dimension D2 is mainly affected by the pressure of inflection point. When calculating the comprehensive fractal dimension Dp, D1 is used to represent the degree of homogeneity of pores. The weight of D1 is controlled by the displacement pressure. Both D1 and D2 represent the contribution of large pores to the physical property of reservoirs. D2 and its weight represent the contribution of small and medium-sized pores to physical properties, and Dp has a good correlation with physical properties parameters. © 2021, Editorial Office of Journal of China University of Petroleum(Edition of Natural Science). All right reserved.
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页码：25 / 34
页数：9
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