Оценка содержания остаточной поровой воды и анализ состава водных вытяжек пород баженовской свиты Западной СибиристатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 27 января 2018 г.
Аннотация:The paper presents the results of experimental studies to quantify the residual pore water content in the core samples of the Bazhenov for- mation with natural water saturation taken from two wells at the Youzh- noye and Vyngayakhinskoye fields, West Siberia using the direct labo- ratory methods of the investigation (Dean Stark and evaporation methods). The chemical and mineralogical rock samples composi- tions obtained using the X-ray diffraction analysis are shown here. The quantitative results of the microcomponents (Li, Be, V, Cr, Co, Ni, Cu, Zn Rb, Cs, U, Pb) and rare earth metals (REE) in the pore waters and in the rock samples are found using mass-spectrometric study (ICP-MC) and presented here for the first time. It also contains the measured values of the rocks cation exchange capacity (Pfeffer method) and results of the pore waters composition of Bazhenov formation obtained via composition analysis of the water extracts. It was found that the grav- ity groundwater content, presumably capillary water, in the studied rock samples is 0.14–2.35 % (wt), the residual pore water content is 0.42-3.65 % (wt). The total content of Na+, K+ and Cl- in the pore waters of the Bazhenov formation are 17.09–79.21 g/L. Using Pfeffer method it was discovered that the cation exchangers of the studied core sam- ples contain Na+, K+, Са2+, Mg2+ and Fe3+ that concentrations change with the depth in wells. The measured values of the shales cation-exchange capacity are 3.98–19.50 meq/100g of rock and cor- respond to the clay minerals content in them.