The rare-earth elements distribution in the Bazhenov shales

Ekaterina Kazak,Natalia Kharitonova,Yana Sorokoumova

doi:10.1051/e3sconf/20199803001

Ekaterina Kazak, Natalia Kharitonova + Show 1 more

Open Access

https://doi.org/10.1051/e3sconf/20199803001

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Abstract

The rare-earth elements and yttrium (REY) distribution data with depth in the Bazhenov formation are given for the case of the one well in the Nizhnevartovsk arch of the Western Siberia, Russian Federation. According to the correlation analysis, it was found that REY (mainly LREE) is concentrated in apatite more than in clays or plagioclase, while HREE is preferably accumulated in clay minerals. It was estimated that the water extracts from the Bazhenov formation contain REY up to 0.014 ppb, while LREE is contained in 3.6 times more than HREE. An attempt to estimate the REY content in the pore water of the Bazhenov formation was made using water extract composition data.

Highlights

The Bazhenov formation has a typical thickness of 15-30 m and is regionally spread across the entire West Siberian basin within the Russian Federation territory at depths of more than 2 km
It was published that the deposits of the Bazhenov formation are enriched with a number of trace elements and rare-earth elements and yttrium (REY) [1, 3]
It was discovered that a number of trace elements (Li, Be, V, Cr, Co, Ni, Cu, Zn, Rb, Cs, U, Pb et al.) and REY content in Bazhenov formation pore water

Summary

Introduction

The Bazhenov formation has a typical thickness of 15-30 m and is regionally spread across the entire West Siberian basin within the Russian Federation territory at depths of more than 2 km. It was discovered that a number of trace elements (Li, Be, V, Cr, Co, Ni, Cu, Zn, Rb, Cs, U, Pb et al.) and REY content in Bazhenov formation pore water. The only available method for the pore solution composition investigation remains the indirect water extracting method from powdered rocks samples with natural moisture, widely used in Russian and foreign practice [4]. This study was aimed to investigate the REY distribution with depth in Bazhenov formation from analyses of 5 core samples taken from the production well of the Nizhnevartovsk arch (Western Siberia, Russian Federation), to make an assessment of REY content in the pore waters using the water extracting method from powdered rocks and oil from the same well interval. The obtained results allowed us to determine the REY concentrators in the Bazhenov formation rock and to outline their ways for entering into the water extract solutions

Sample collection and study methods

Main results and discussion