石油与天然气地质2025，Vol.46Issue(2)：462-477,16.DOI:10.11743/ogg20250209
松辽盆地大陆科学钻探井天然氢气吸附特征及赋存规律
Adsorption characteristics and occurrence pattern of natural hydrogen in a continental scientific drilling well of the Songliao Basin
摘要
Abstract
High-content natural hydrogen has been discovered in well SK-2 of the Continental Scientific Drilling Project of the Cretaceous Songliao Basin.Hydrogen gas in reservoirs with varying lithologies exhibits different complex adsorption characteristics.Using experimental data from reservoirs with natural hydrogen anomaly shows in well SK-2 and molecular dynamics methodology,we investigate the adsorption characteristics of natural hydrogen in reservoirs with varying lithologies under different geologic conditions.Furthermore,we explore the occurrence variation pattern of natural hydrogen based on temperature,pressure,pore diameter,pore type,and competitive adsorption of gases.The results indicate that the reservoirs with natural hydrogen anomaly shows exhibit a hydrogen content of up to 26.89%,a mineral composition dominated by clay and quartz and a relatively high organic matter content.Pores of organic matter and clay in these reservoirs absorb natural gas rich in hydrogen.Among them,pores with relatively small sizes(0.4～7.0 nm in diameter)may serve as the primary spaces for hydrogen gas occurrence.In pores larger than 0.5 nm that contain both hydrogen gas and methane,the adsorbed hydrogen gas content remains low,while the content of free hydrogen gas increases with pore size.Montmorillonite demonstrates the highest adsorption capacity for hydrogen gas.However,competitive adsorption for methane reduces the hydrogen gas content in pores,hindering its enrichment.An increase in pressure significantly enhances the adsorption capacity of pores for hydrogen gas,whereas a rising temperature intensifies their desorption process for hydrogen gas.As the temperature increases,adsorbed hydrogen gas in pores of quartz and illite is more prone to convert into free gas.Micropores manifest a relatively high adsorption capacity for hydrogen gas,serving as the primary spaces for the occurrence of adsorbed hydrogen gas.The deep iron-rich rocks or mantle activity in the study area ensure sufficient hydrogen gas supply,enabling natural hydrogen generated to accumulate in deep sedimentary reservoirs.The hydrogen gas content gradually decreases with the generation of hydrocarbon gases,the conversion of adsorbed hydrogen gas into free gas,and hydrogen gas dissipation,leading to the formation of hydrogen-rich natural gas accumulation zones dominated by methane.关键词
吸附特征/分子模拟/赋存规律/大陆科钻/天然氢气/松辽盆地Key words
adsorption characteristic/molecular simulation/occurrence pattern/continental scientific drilling/natural hydrogen/Songliao Basin分类
能源科技引用本文复制引用
韩双彪,王缙,黄劼,王成善..松辽盆地大陆科学钻探井天然氢气吸附特征及赋存规律[J].石油与天然气地质,2025,46(2):462-477,16.基金项目
国家自然科学基金面上项目(42072168) （42072168）
中央高校基本科研业务费项目(2023ZKPYDC07). （2023ZKPYDC07）
