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| Discussion on role of gas diffusion and its contribution in low porosity-permeability tight sandstone gas reservoirs |
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WANG Xiaobo1,2,3, CHEN Jianfa1, LI Jian2,3, LI Zhisheng2,3, WANG Dongliang2,3, LIU Guangdi1, XIE Zengye2,3, LIU Ruie2,3, SUN Mingliang1, WANG Yifeng2,3
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(1.State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum,Beijing 102249, China;2.Langfang Branch of PetroChina Research Institute of Petroleum Exploration ＆ Development, Langfang 065007, China;3.The Key Laboratory of Gas Reservoir Formation and Development,CNPC,Langfang 065007, China)
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| Abstract: |
| Assuming that gas diffusion is controlled by its concentration gradient, the physical simulation experiments of gas difussion driven by concentration gradient were conducted, and the role of gas diffusion and its contribution in low porosity-permeability tight sandstone gas reservoirs, as well as forming mechanisms of low porosity-permeability tight gas reservoirs were discussed. The results show that the maximum gas saturation in the simulations has overall negative linear correlation with the gas physical properties:it correlates with the gas porosity when permeability is less than 0.1×10-3μm2; and correlates with the gas permeability when permeability is larger than 0.1×10-3μm2. Gas diffusion may become the main mechanism for gas saturation increment in low porosity-permeability tight sandstone reservoir, when porosity is less than 0.6％ and permeability is less than 0.01×10-3μm2. Gas diffusion is one of the important forming mechanisms of low porosity-permeability tight gas reservoir, and one of the important reasons for low porosity-permeability tight reservoir with large gas bearing area. |
| Key words: tight sandstone gas reservoirs simulation experiment of gas diffusion concentration gradient quantitative evaluation forming mechanism |
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