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研究了鄂尔多斯盆地油气伴生水的稀土元素地球化学特征。结果表明,油气伴生水的稀土元素含量明显偏高,物质来源具有多源性;油气伴生水普遍形成强度不等的Eu和Ce负异常,表明其主要形成于还原环境,但在后期演化过程中经历了氧化环境的改造,并与围岩发生过相互作用,且受后期改造程度较高。该油气伴生水的稀土元素球粒陨石标准化曲线具有4种基本模式,其中,SH-4样品的稀土总量∑REE极高,稀土总量介于上地幔和下地壳的岩石之间,稀土模式图及稀土比值特征接近下地壳,显示其中有深部物质加入。在基底断裂发育、构造活动相对强烈的区域所赋存的油气伴生水中,深部物质组分相对较多,表明其在运移过程中可能与深部岩石有过相互作用,抑或有深部流体物质加入。
The geochemical characteristics of REE in the oil and gas associated with the Ordos Basin are studied. The results show that REE content of associated water from oil and gas is obviously higher and the source of the material is multi-source. The negative anomalies of Eu and Ce with varying intensity generally form in the associated oil and gas, indicating that they are mainly formed in the reducing environment. However, during the evolutionary process Experienced the transformation of the oxidative environment, and had interaction with the surrounding rock, and the higher degree of late reform. There are four basic patterns of REE chondrite meteorite normalization curve. Among them, the total REEs of SH-4 samples are very high, and the total REEs are between the upper mantle and the rocks of the lower crust. The REE patterns Figure and rare earth ratio characteristics close to the lower crust, which shows the deep material added. In the areas associated with the rupture of the basement and the tectonic activity, there are relatively many deep-sea material components in the water associated with oil and gas, indicating that they may have interacted with deep rocks during migration or may have deep fluid materials added.