石油勘探与开发2014，Vol.41Issue(2)：248-256,9.DOI:10.11698/PED.2014.02.17
页岩孔隙结构对甲烷吸附能力的影响
Effect of pore structure on methane sorption capacity of shales
摘要
Abstract
Samples from the lower Paleozoic marine shale and Mesozoic continental shale in the west of middle Yangtze region were taken to investigate the effect of pore structure characteristics on the methane sorption of shale using field emission scanning electron microscope (FE-SEM), low pressure N2 isotherm analysis and high pressure methane sorption analysis. A mass of organic matter pores (mostly with pore diameter less than 50 nm) have been found in the high thermal evolution marine shale rich in organic matter. The positive correlation between TOC, N2 BET surface areas and sorption capacity in shale indicate that micro-porosity associated with organic matter is the key factor controlling methane sorption capacity of high thermal maturity shale rich in organic matter. The development of organic matter pores was limited in the organically lean marine shale and continental shale due to the lower TOC content and lower thermal maturity respectively, and their reservoir space is composed of inorganic matter pores in 30 nm to 4.5μm diameter. Providing bigger specific surface area for methane sorption, the pores within or between clay particles is an important factor to affect methane sorption capacity. With the increase of thermal maturity, the major pore system of shale reservoir changes from inorganic matter pores to organic matter pores, favorable for the improvement of methane sorption capacity of shale.关键词
页岩/孔隙类型/孔隙结构/甲烷吸附性Key words
shale/pore type/pore structure/methane sorption分类
能源科技引用本文复制引用
侯宇光,何生,易积正,张柏桥,陈学辉,王亿,张建坤,程春阳..页岩孔隙结构对甲烷吸附能力的影响[J].石油勘探与开发,2014,41(2):248-256,9.基金项目
国家自然科学基金项目(41302111) （41302111）
中央高校基本科研业务费专项资金资助项目(CUGL110247) （CUGL110247）
构造与油气资源教育部重点实验室基金项目(TPR-2013-19) （TPR-2013-19）
国家科技重大专项(2011ZX05005-002) （2011ZX05005-002）
