川西凹陷雷口坡组稀土元素特征及其意义

对川西凹陷丰卤1井雷口坡组岩屑样品进行了稀土元素(REE)的分析.结果表明,通过REE参数∑REE、LREE、HREE、w(LREE)/w(HREE)、w(LaN)/w(YbN)、δ Ce和δ Eu的比较,雷口坡组∑REE与LREE和HREE的变化呈正相关,LREE占∑REE的74%,对∑REE的变化起主要影响作用;R...

Characteristic and Significance of Rare Earth Elements in Leikoupo Formation, West Sichuan Depression

The content of REE of Debris samples of leikoupo formation of Fenglu No.1 well drilling in west Sichuan depression was analysed.The results show that through comparing ∑REE,LREE,HREE,w(LREE)/w(HREE),w(LaN)/w(YbN),δ Ce and δ Eu,the variation is positive correlation between ∑REE and LREE and HREE of Leikoupo formation,it is main influence that LREE account for 74% of ∑REE.REE’ content is related to lithology of rock.,the content is shorter in the anhydrite;The w(LREE)/w(HREE) and w(LaN)/w(YbN) reflected a differentiation of the light and heavy rare earth,it is LREE enrichment type in Leikoupo formation.The specific value equally is worth very close from the second to fourth segment in Leikoupo formation,the change hanppened inside the system;The abnormality of the Ce and Eu mainly reflects a kind environment of the oxidize or revivification,the abnormality of Ce represent oxidize environment,the abnormality of Eu represent is to restore environment.The Ce presents a weak negative abnormality,the Eu present strong positive anomaly in Leikoupo formation,and δ Eu is increased progressively from the second to fourth segment in Leikoupo formation,the study indicates the great abnormality of Eu is related to the late reaction of rock.