Kolpakov Vitaly V. RussiaKogalym“KolgalimNIPIneft” branch of LLC “Lukoil-Engineering”, Strl. Republic, 143A, Tyumen, Tyumen region, 625048начальник Центра исследования керна и пластовых флюидовKolpakovVV@nipi.ws.lukoil.com Author's articles Lithogeochemical Properties оf Terrigenous Rocks of Sortymsky Suite of Pyakyakhinskoye Field (North of Western Siberia)