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首页> 外文期刊>Fuel >Geochemical implications of trace elements and sulfur in the saturate, aromatic and resin fractions of crude oil from the Mara and Mara Oeste fields, Venezuela
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Geochemical implications of trace elements and sulfur in the saturate, aromatic and resin fractions of crude oil from the Mara and Mara Oeste fields, Venezuela

机译：委内瑞拉Mara和Mara Oeste油田原油的饱和，芳族和树脂馏分中的微量元素和硫的地球化学意义

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摘要

Ten trace elements (Cr, Zn, Fe, Mn, Cu, Co, Ni, Mo, V and Sr) and sulfur were determined in the saturate, aromatic and resin fractions of 15 crude oils from Mara (DM) and Mara Oeste (DMO) fields of the Maracaibo Basin, Venezuela. The oils studied are classified as unaltered or altered by biodegradation. In the altered oil, the depletion of n-alkanes, the absence of isoprenoids and the presence of steranes and hopanes unaltered by biodegradation are indicative of moderate biodegradation. The elements Zn, Fe, Mn, Cu, Ni, and Sr were detected in the saturated hydrocarbon fraction; Cr and V were detected in the aromatic fraction in addition to the above elements; whereas the elements detected for the resin fraction were Cr, Zn, Fe, Cu, Ni, Mo, V, and Sr. Co was not detected in any fractions of the oils analyzed. Sulfur was found in all fractions of the oils studied. It was proposed that Fe, Zn, Sr, and Mn could have entered the oil during migration or Fe, Zn and Mn as pollutants during oil extraction. Cr and Cu may be of biological origin and Mo could be incorporated into the reservoir through bacteria. Only S, V, and Ni in the resin fractions can be used as indicators of the origin and correlation of Mara and Mara Oeste oils. Based on the results obtained in this work, it can be established that the V/(V + Ni) ratio in the resin fraction can be used as a correlation parameter, for these oils.
机译：在来自Mara（DM）和Mara Oeste（DMO）的15种原油的饱和，芳族和树脂馏分中测定了十种微量元素（Cr，Zn，Fe，Mn，Cu，Co，Ni，Mo，V和Sr）和硫）委内瑞拉马拉开波盆地的油田。所研究的油被归类为未改变的或通过生物降解改变的。在蚀变油中，正构烷烃的消耗，类异戊二烯的不存在以及未被生物降解改变的甾烷和hop烷的存在表明中等程度的生物降解。在饱和烃馏分中检测到锌，铁，锰，铜，镍和锶元素。除上述元素外，还检测出芳香族部分中的Cr和V。而树脂馏分中检测到的元素是Cr，Zn，Fe，Cu，Ni，Mo，V和Sr。在所分析的任何馏分中均未检测到Co。在所研究油的所有馏分中都发现了硫。有人提出在迁移过程中铁，锌，锶和锰可能已经进入油中，或者在提取油时铁，锌和锰可能是污染物。 Cr和Cu可能是生物来源，Mo可能通过细菌掺入到储层中。树脂馏分中只有S，V和Ni可以用作Mara和Mara Oeste油来源和相关性的指标。根据这项工作获得的结果，可以确定对于这些油，可以将树脂级分中的V /（V + Ni）比用作相关参数。

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