可溶一元正脂肪酸分布模式表征参数有效性评价

The Validity Evaluation of Parameters for Distribution Model of Monosaturated Fatty Acid in Depositional Environment Differentiation

详细分析了２３个代表不同沉积环境类型的样品中可溶一元正脂肪酸分布模式表征参数，结果认为：Ｈ／Ｌ，ＣＰＩ及峰型和主峰碳数都是较为有效的沉积环境区分指标，而ＣＤＩ则敏感性较差．一般地，Ｈ／Ｌ大于４．２８，ＣＰＩ低于４．２与成煤成炭氧化环境相联系，而Ｈ／Ｌ小于４．２８，ＣＰＩ高于４．２则与海洋、淡水湖泊还原环境相联系．ＣＤＩ值在作为热熟度指标效果较差，而ＣＰＩ值对区分大的热熟度差别是有效的．

The distribution model of solventextractable monosaturated fatty acid from 25 representative samples was studied to evaluate their validity to differentiate depositional environments. Results show that H/L(∑C20+/∑C20-), CPI (Carbon Preference Index) and Cmax are senitive parameters for depositional environmental differentiation, while CDI (Composition Diversity Index) is not so effective as the former three are. Normally, H/L value higher than 4.28 and CPI value lower than 4.2 is associated with an oxic peatification/coalification environment, while H/L value lower than 4.28 and CPI value higher than 4.2 is a reliable indication of fresh water, reductive depositional environment.