现代地质2013，Vol.27Issue(2)：413-424,12.
祁连山冻土区含天然气水合物层段岩心热模拟实验研究
Study of Thermal Simulation on Cores at Gas Hydrate-bearing Intervals in the Qilian Mountain Permafrost
摘要
Abstract
Gas composition and carbon isotopes of hydrocarbon gases thermally simulated from cores (mud-stone, oil shale and coal) were compared with gases from gas hydrate at gas hydrate-bearing intervals in the drilling of DK-2 and DK-3 in Qilian Mountain permafrost. The purpose is to explore possible links between these gas source rocks and gas sources of gas hydrates. The results indicate that thermally simulated gases are mainly composed of CO2 with a small amount of hydrocarbon gases on the low temperature conditions (< 300℃) ; the yields of hydrocarbon gases from the mudstone, oil shale and coal gradually increase, displaying differences between adsorbing gas with different rock. With increasing of thermal simulation temperatures, yields of hydrocarbon gases from the mudstone, oil shale and coal obviously increase and reach maximum values at 500 ℃; conversely, yields of CO2 vary a little. With increasing of thermal simulation temperatures, carbon isotope values of hydrocarbon gas firstly become lighter and then heavier and are characteristics of normal carbon isotopic series of δ13C1 <δ13C2 <δ13C3. The consequence suggests that hydrocarbon gases from mudstone in the range of 350℃ to 400℃ or from oil shale in the range of 380 ℃ to 400 ℃ have similar features of gas composition and carbon isotope with gas hydrate, indicating that the gas source of gas hydrate has geochemically genetic relation with deep mudstone or oil shale. In contrast, the gas composition of hydrocarbon gases from coal and gas hydrate are similar, but their carbon isotope values are incomparable, suggesting that the relationship between coal and gas source of gas hydrate is not closely associated.关键词
祁连山冻土区/天然气水合物/热模拟实验/气体组分/碳同位素Key words
Qilian Mountain permafrost/ gas hydrate/ thermal simulation/ gas component/ carbon isotope分类
天文与地球科学引用本文复制引用
薛小花,卢振权,廖泽文,刘辉..祁连山冻土区含天然气水合物层段岩心热模拟实验研究[J].现代地质,2013,27(2):413-424,12.基金项目
国家自然科学基金项目(41073040,41202076) （41073040,41202076）
国家重点基础研究发展计划项目(2009CB219501) （2009CB219501）
天然气水合物勘查与试采专项项目(GZHL20110311) （GZHL20110311）
中央公益性科研院所基本科研业务费专项基金项目(K1207). （K1207）
