Reservoir pore classification and evaluation based on fractal characteristics and cluster analysis
In view of the weak research on the pore structure characteristics of Ziniquanzi formation reservoir in Huo 10 well area,based on the fractal geometry theory,by means of physical properties,SEM,high pres-sure mercury injection and other experimental tests,the pore structure characteristics of reservoir were ana-lyzed,the fractal model was established,the principle of parameter optimization was established,and the pore structure was classified by fast cluster analysis.The capillary force curve and Bayes discriminant analysis verified the validity of the classification results.The results showed that the pore structure of Ziniquanzi forma-tion reservoir in Huo 10 well area was complex,mainly developed primary intergranular pore and residual in-tergranular pore,with a small amount of intragranular dissolved pore and micro fracture;the overall medium and low porosity(especially)low permeability.Fractal model was established according to high pressure mer-cury injection parameters,and the calculated fractal dimension could quantitatively characterize the heteroge-neity of pore structure.Eight parameters were selected and applied to fast clustering,and the pore structure was divided into three types.The capillary force curve and Bayes discriminant test results showed that the clas-sification effect of this method was obvious,and the accuracy rate was 98%.
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