Inorganic Geochemistry of Crude Oils of Northern Eurasia after ICP-MS Data as Clear Evidence for Their Deep Origin

Abstract

The emergence of mass-spectroscopy with inductively-coupled plasma (ICP-MS) made it possible to study the microelement composition of crude oil and its derivatives with the limit of detection (LOD) at the ppt level. We have studied the crudes from West Siberian (Shaimsky, Sredneobsky and Oktyabrsky regions) and Tatarstan Romashinskoye oilfields with the ICP-MS method to detect 50 rare, rare-earth, and other microelements. The elemental composition is reasonably comparable to their concentrations in ultrabasites whereas the contents of most of the elements are low to the limit. On the diagrams of rare-earth elements, one can see the prevalence of light lanthanides and positive europium anomaly. Increased content of platinoids was found in Tatar oils; in some cases, the concentration of ruthenium reaches 0.06 g/t. The study shows that studied crudes have a specific microelement composition. Based on the elevated contents of transit elements and platinoids, a conclusion was made about the “ultrabasic” geochemical–metallogenic specialization of studied petroleum systems and the assumption about its origin was proposed.

Stable and Radioactive Cesium in Natural Environment

“…Určitý problém však mohou představovat požáry nebo nevhodné způsoby spalování biomasy, případně i rašeliny kontaminované radioaktivním spadem, kdy může určitý podíl radioizotopů Cs uniknout v jemném aerosolu 31,35 . Také v ropě jsou koncentrace Cs nízké na to, aby měly ekonomický, technologický nebo ekologický význam 36 , a publikovaných dat je proto málo. Mravenčan cesný je však klíčovou složkou těžkých tekutin používaných v průzkumu i těžbě ropy; v současnosti má největší podíl na průmyslovém využití Cs (cit.…”

Analysis of Kazakhstan Crude Oil Biomarkers by Gas Chromatography in Combination with Mass Spectrometry

“…So over time, biomarker analyses have developed as the main techniques used in petroleum exploration to study crude oils, their origin, and maturity. In this context, gas chromatography-mass spectrometry (GC-MS) has been widely used as the method of choice for disclosing biomarkers [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”