Stochastic Model Of The Reservoir Microstructure And Its Seepage Law Numerical Simulation

Based on the CT image of reservoir core，some research about the randomdistribution characteristics of the microscopic structure of the reservoir pore hadbeen done by using stochastic theory．Then reconstruct two-dimensional micro-porestructure of the reservoir based on Monte-Carlo stochastic simulationtechniques． Through the numerical simulation of the reconstruction oftwo-dimensional micro-pore structure by Comsol Multiphsics software，we haveanalysis the corresponding macro-seepage parameter for the results of microscopicsimulation． And then to study the impact which the random distributioncharacteristics of pore micro-geometric parameters exert on macro-seepageparameters，and random distribution law of it．The main contents are as follows：(1) Extracted the microscopic pore structure from CT image of the core basedon digital image processing technology，and construct the describe parameter ofgeometry characteristics under the analysis of it．And then analysis of the differentlayers at the pore structure based on CT image, and the statistical characteristics ofthe pore geometric parameters．(2) Establish randomly distributed model after the statistically analysis of theactual data and pore description parameters with the introduction of stochastictheory．Combine with the statistical characteristics of pore parameters，randomlygenerated a series of pore model sample according to this distribution by usingMonte-Carlo stochastic simulation techniques．(3) Numerical simulation of the model established before by ComsolMultipysics, which is a finite elements software suit for multi-field coupling．Thenfind the seepage law of pores at micro level through a series of numericalexperiments．Study the interaction between the fluid and the solid of the pore basedon the incompressible N-S equations． To derivation random variation of themacroscopic parameters law from microscopic． (4) Analyze and evaluate the results of reconstruction model simulation，thento study the mechanism of action between fluid and solid in the pores and theimpact which parameters exert on microscopic seepage． To evaluate thediscrepancy between the two sorts of mode in methods based on calculate of actualpore model．To comparison and evaluation the results of reconstruction model withtaking into account the impact of different parameters．Evaluate the validity of themodel with the variation of macroscopic parameters．...