摘要
三环萜烷类化合物普遍存在于各类原油与烃源岩中,具有较强的抗生物降解能力及环境指相意义。通过地球化学分析手段对库车坳陷10个腐殖煤样品进行分子化合物研究,发现库车河剖面与卡普沙良河剖面腐殖煤三环萜烷的分布模式差异迥然,库车河剖面主要分布模式为“C_(19)下降型”(C_(19)>C_(20)>C_(21)<C_(23)),卡普沙良河剖面主要分布模式为“C_(21)主峰型”(C_(19)<C_(20)<C_(21)>C_(23))与“C_(23)主峰型”(C_(19)<C_(20)<C_(21)<C_(23))。研究还发现库车河剖面与卡普沙良河剖面腐殖煤成熟度存在明显差异,成熟度的增长会引起三环萜烷的总量上升以及单个三环萜烷化合物绝对量的变化,但在一定成熟度范围内(镜质体反射率(R o)<1.5%),三环萜烷分布模式不发生改变。卡普沙良河剖面腐殖煤三环萜烷分布模式的变化主要受还原环境以及海侵作用引起的细菌等微生物对高等植物的生物改造及低等水生生物输入的影响。
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“C_(19) descending type”(C_(19)>C_(20)>C_(21)<C_(23)),and the main distribution pattern of Kapushaliang River section is“C_(21) single peak type”(C_(19)<C_(20)<C_(21)>C_(23))and“C_(23) single peak type”(C_(19)<C_(20)<C_(21)<C_(23)).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(R_(o))<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.
作者
张敏
项威
张文俊
李洪波
ZHANG Min;XIANG Wei;ZHANG Wenjun;LI Hongbo(Hubei Key Laboratory of Petroleum Geochemistry and Environment(Yangtze University),Wuhan 430100,Hubei;Tianjin Branch,CNOOC Limited(China),Tianjin 300459)
出处
《长江大学学报（自然科学版）》
2024年第2期23-35,共13页
Journal of Yangtze University(Natural Science Edition)
基金
国家自然科学基金项目“地质体中高丰度三环萜烷类化合物的成因机制与石油地质意义”(42072165)。
关键词
三环萜烷
沉积环境
分布模式
库车坳陷
tricyclic terpane
sedimentary environment
distribution pattern
Kuqa Depression
