Study on the reasons for the abnormal distribution of Jurassic humic coal tricyclic terpenes in Kuqa Depression
Tricyclic terpanes are ubiquitous in various crude oils and source rocks,and they possess strong resistance to biodegradation and environmental significance.This article mainly research on ten humic coal samples that taken from Kuqa River section and Kapushaliang River section in Kuqa Depression throughout the molecular compound by normal geochemical analysis methods.It is found that the distribution patterns of tricyclic terpenes between Kuqa River and Kapushaliang River sections are quite different.The main distribution pattern of Kuqa River section is"C19 descending type"(C19＞C20＞C21＜C23),and the main distribution pattern of Kapushaliang River section is"C21 single peak type"(C19＜C20＜C21＞C23)and"C23 single peak type"(C19＜C20＜C21＜C23).The maturity of the humic coal in Kuqa River section is low while the maturity of the humic coal in Kapushaliang River section is high.The maturity increasing spur up the total amount of tricyclic terpenes rising up relatively and control the changes of the absolute amount of individual tricyclic terpene compounds.Within a certain maturity range(vitrinite reflectance(Ro)＜1.5％),the distribution pattern of tricyclic terpenes does not change.The main charger in the distribution patterns change of humic coal tricyclic terpanes in Kuqa River section and Kapushaliang River section is the biotransformation of higher plants that caused by bacteria and other microorganisms while the transgression.
万方数据
维普
