n-Alkanes is widely used in the study of geologic body, which occupies 50%-80% of the saturated hydrocarbons commonly. The biogenetic implication of these compounds hold a very important value for the evaluation of al...n-Alkanes is widely used in the study of geologic body, which occupies 50%-80% of the saturated hydrocarbons commonly. The biogenetic implication of these compounds hold a very important value for the evaluation of all source rock, so it is used as biomarker to backward the biogenetic source of deposit organic matter. In order to find the difference of the isotopic composition of different organic compounds before and after complexion the oil shale in Yaojie, Gansu sample was performed by 5 molecular sieve adsorptipon to study the variation of the isotope compositions of n-alkanes, isoalkanes and cyclanes. On the basis of the previous work, the mini-sized Soxhlet extraction set with a hot reflux device was adopted to enhance the recovery of samples and diminish the loss of light components in the tested samples.展开更多
Saturated hydracarbon of coal,carbonaceous mudstone and oils from the Lower Jurassic coal measures in the Turpan basin were studied,and biomarker characteristics and coal thermal maturity analyzed to draw the followin...Saturated hydracarbon of coal,carbonaceous mudstone and oils from the Lower Jurassic coal measures in the Turpan basin were studied,and biomarker characteristics and coal thermal maturity analyzed to draw the following conclusions. There are many similar biomarker characteristics between oil from middl-lower Jurassic of Turpan Basin and coal and carbonaceous mudstone in the same strata. They all contain specific r-lupane, I-norbietane, C24-tetracyclic and high content of C29-steranes. These characteristics suggest that they have similar matter source of the organic matter derived from matter with abundant high plants. Meanwhile, biomarkers often used to indicate depositional environments characterized by high Pr/Ph ratio, little or no gammacerane and high abundance dibenzofurans, such biomarker distributions are indicative of suboxic and freshwater environment. Although coal and carbonaceous mudstone remain in lower thermal maturity (Ro=0.47-0.53), but C29-ββ/(αα+ββ) sterane ratio (0.294-0.489) and bezohopane are detected. Because these ferture are related to bacterial activity, bacterial degrdation of organic matter maybe take an important role in coal-derived oil.展开更多
文摘n-Alkanes is widely used in the study of geologic body, which occupies 50%-80% of the saturated hydrocarbons commonly. The biogenetic implication of these compounds hold a very important value for the evaluation of all source rock, so it is used as biomarker to backward the biogenetic source of deposit organic matter. In order to find the difference of the isotopic composition of different organic compounds before and after complexion the oil shale in Yaojie, Gansu sample was performed by 5 molecular sieve adsorptipon to study the variation of the isotope compositions of n-alkanes, isoalkanes and cyclanes. On the basis of the previous work, the mini-sized Soxhlet extraction set with a hot reflux device was adopted to enhance the recovery of samples and diminish the loss of light components in the tested samples.
文摘Saturated hydracarbon of coal,carbonaceous mudstone and oils from the Lower Jurassic coal measures in the Turpan basin were studied,and biomarker characteristics and coal thermal maturity analyzed to draw the following conclusions. There are many similar biomarker characteristics between oil from middl-lower Jurassic of Turpan Basin and coal and carbonaceous mudstone in the same strata. They all contain specific r-lupane, I-norbietane, C24-tetracyclic and high content of C29-steranes. These characteristics suggest that they have similar matter source of the organic matter derived from matter with abundant high plants. Meanwhile, biomarkers often used to indicate depositional environments characterized by high Pr/Ph ratio, little or no gammacerane and high abundance dibenzofurans, such biomarker distributions are indicative of suboxic and freshwater environment. Although coal and carbonaceous mudstone remain in lower thermal maturity (Ro=0.47-0.53), but C29-ββ/(αα+ββ) sterane ratio (0.294-0.489) and bezohopane are detected. Because these ferture are related to bacterial activity, bacterial degrdation of organic matter maybe take an important role in coal-derived oil.
