A Preliminary Study of Negative Adsorption Phenomena of Shale Adsorption Gas Content by Isothermal Adsorption
详细信息
- 责任者：Nie Haikuan (Research Institute of Petroleum Exploration and Development ; SINOPEC ; Beijing 100083 ; China) ; Zhang Jinchuan
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(6)
- 关键词：页岩气 ; shale gas ; 四川盆地 ; Sichuan Basin
- 页码：p.282-288
- 图表：5 illus., 13 refs.
- 分类号：1003
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
China is still in the early stage of shale gas exploration and development.The isothermal adsorption test is commonly used to acquire adsorbed gas content and quantitatively evaluate the quality and resource potential of the shale gas reservoir.It is found that with increasing pressure the adsorbed gas content is not always increased,but shows a decreasing trend,or even negative.The isothermal adsorption test studies of 48black shale samples from Lower Cambrian and Upper Ordovician and Lower Silurian in Sichuan Basin and its surrounding areas have shown that this phenomenon can not objectively reflect the adsorbed gas content of shale.The negative adsorption phenomena is mainly related with the principles adapted in the isothermal adsorption test,the prevailing pressure,the size of the free space,the real adsorbed gas content,the microscopic pore structure,the adsorbents and other factors.Because of high adsorption capacity and nanoscale micropore are not developed in organic-rich shales,the negative adsorption phenomena caused by the increase in free space are not obvious;however,due to the low adsorption capacity and nanoscale micropore developed in organic-poor shale,the negative adsorption phenomena caused by the increase in free space are obvious.No matter what kind of impact factors caused the negative adsorption phenomena of shale it will lead to the apparent adsorbed gas content smaller than the actual adsorbed gas content.This negative adsorption underestimates the potential occurrence of shale reservoir.The real shale adsorption capacity may be much larger than the experimental data obtained.The present paper systematically analyzes the factors that caused the negative adsorption phenomena,puts forward the correction recommendations for the negative adsorption phenomenon and provides the basis for accurate determination of the adsorbed gas content of shale and for the objective evaluation of shale gas resources.
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