Аннотация:In his book “The past… for the future” academician Dmitry Likhachov wrote: “Every scientist has to acknowledge his predecessors, be respectful to contemporaries, and assume responsibility to future scientists. Then his contribution will remain a guidance for many years.” This idea appears increasingly topical these days, in particular with regard to various projections where it is critical to be guided by the past and analyse the present day to gain explicit vision of the future. Guided in this research by the principles of this prominent scientist, the author presents his economic and mathematical models which are believed to be a useful tool for gas production outlooks in East Siberia.