The Similitude Research On Physical Model Experiment Of Tectonic Deformation And Hydrocarbon Migration

Physical model experiment of tectonic deformation and hydrocarbon migration is a simulation of real geological phenomenon and oil-gas migration under laboratory conditions. The key determining the credibility of the experimental results is the similarity level between the processes in lab and nature. In order to convert natural conditions into laboratory environment, similarity calculations were made to get the theoretical parameters of similarity materials according to the similarity law. Then, Mixture tests were conducted to procure ingredients ’ratios of the similarity materials. Finally, Methods raised in this paper would be used to prove the similarity system reliable.To acquire appropriated similar material, the parameters of experimental facilities and Dongying Depression were analyzed so that basic similarity scales were set. With the scales and similarity laws, proper parameters of similarity material were obtained from the data of rock stratums and hydrocarbon in Dongying Depression. Uniform design was applied to mixture tests then and the ratios of ingredients were confirmed.In this paper, we used four methods to examine the similarity level between the deformable material we developed and real rocks in the nature. π method analyzed triaxial test data to make sure their π values are proper. Stress-strain curve method applied theoretical and real deformable similarity material into numerical triaxial test so that the difference between the curves can show the similarity degree. In addition, we conducted model and numerical experiments with deformable similarity materials and original rocks respectively, the contrast of results can help to estimate the similarity level. Structural feature method appropriated materials’ microcosmic structure with their electron microscopy photos.An extended π method was applied to judge the degree of hydrocarbon similarity material, which analyzed theoretical and real hydrocarbon’s properties considering parameter difference and π difference. And it used a comprehensive index to express similarity level.At last, the effectiveness of the similarity system would be shown through real typical instances.