- 责任者：Hu Haiyan (School of Geosciences ; Yangtze University ; Wuhan 430100 ; China)
- 刊名：Acta Petrolei Sinica
- 出版年：2013
- 卷期：34(5)
- 关键词：页岩气 ; shale gas ; 热模拟 ; thermal simulation
- 页码：p.820-825
- 图表：4 illus., 1 table, 35 refs.
- 分类号：1003
- issnNo：ISSN0253-2697
- isbnNo：CN11-2128/TE
To study porosity evolution of organic-rich shale, five immature shale samples collected from outcrops were analyzed by py- rolyzing them in a thermal simulation experiment. Organic-rich shale samples with different thermal maturities were obtained in the lab and their maturities referred to immature, early bitumen-formation, late bitumen-formation, late oil formation and oil-cracking stages, respectively. Nano-pores in these five shale samples were then measured on a specific surface area analyzer. A series of nitro gen adsorption isotherms were measured, which showed that nano pores increase with thermal maturity increasing and so does the porosity in the organic rich shale, which is obviously different from the porosity evolution in matrix. The porosity changes little at the oil window, but drastically increases in the gas window, which is consistent with calculated value based on the mass balance theo- ry. Therefore, it can be concluded that increase in porosity of the organic rich shale results dominantly from the organic matter con version of oil to gas.