首页|期刊导航|中国地球化学学报（英文版）|Carbon isotopic characteristics of hydrocarbon gases from coal-measure source rocks--A thermal simulation experiment
中国地球化学学报（英文版）2006，Vol.25Issue(2)：167-172,6.
Carbon isotopic characteristics of hydrocarbon gases from coal-measure source rocks--A thermal simulation experiment
Carbon isotopic characteristics of hydrocarbon gases from coal-measure source rocks--A thermal simulation experiment
摘要
Abstract
Gaseous hydrocarbon geochemistry research through a thermal simulation experiment in combination with the natural evolution process in which natural gases were formed from coal-measure source rocks revealed that the δ13C1 values of methane vary from light to heavy along with the increase of thermal evolution degree of coal-measure source rocks, and the δ13C2 values of ethane range from -28.3‰ to -20‰ (PDB). δ13C2 value was -28‰± ( Ro= 0.45% - 0.65%) at the lower thermal evolution stage of coal-measure source rocks. After the rocks entered the main hydrocarbon-generating stage (Ro=0.65% - 1.50%), δ13C2 values generally varied within the range of -26‰ - -23‰±; with further thermal evolution of the rocks the carbon isotopes of ethane became heavier and heavier, but generally less than - 20‰.The partial carbon isotope sequence inversion of hydrogen gases is a characteristic feature of mixing of natural gases of different origins. Under the condition of specially designated type of organic matter, hydrogen source rocks may show this phenomenon via their own evolution.In the lower evolution stages of the rocks, it is mainly determined by organic precursors that gaseous hydrocarbons display partial inversion of the carbon isotope sequence and the carbon isotopic values of ethane are relatively low. These characteristic features also are related to the geochemical composition of primary soluble organic matter.关键词
coal-measure source rock/thermal simulation/carbon isotopeKey words
coal-measure source rock/thermal simulation/carbon isotope分类
天文与地球科学引用本文复制引用
ZHENG Jianjing,HU Huifang,SUN Guoqiang,JI Limin..Carbon isotopic characteristics of hydrocarbon gases from coal-measure source rocks--A thermal simulation experiment[J].中国地球化学学报（英文版）,2006,25(2):167-172,6.基金项目
This research project was financially supported jointly by the National Basic Research (973) Program of China (No. 2001CB209102) and the Important Direction Project of Knowledge Innovation in Resources and Environment Field sponsored by the Chinese Academy of Sciences (KZCX3-SW-128). （973）
