Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Emmanuïl Bogdanovych Chekaliuk (Gnizdychev, Zhydachiv District, Lviv Oblast, May 6, 1909 Lviv, January 5, 1990) was a Ukrainian petroleum engineer and statistical thermodynamicist. He first produced rigorous physical and mathematical evidences of petroleum thermodynamic stability at mantlean conditions. Since 1990 s the heavy hydrocarbons mixture enriched with organometallic compounds is widely known as Chekaliuk s petroleum