Kazakhstan journal for oil & gas industryKazakhstan journal for oil & gas industry2707-42262957-806XKMG Engineering10858710.54859/kjogi108587Review ArticleOverview of some ultra-deep oil and gas projects that have not achieved their initial goalsKhafizovSergey F.khafizov@gubkin.ruhttps://orcid.org/0000-0003-1426-7649SyngaevskyPaul E.pavel.syngaevsky@chevron.comRussian State University of oil and gas named after GubkinChevron151020224339681008202214092022Copyright © 2022, Khafizov S.F., Syngaevsky P.E.2022<p><em>A number of articles were published in the journal "Bulletin of the Oil and Gas Industry of Kazakhstan" in 202022 with the participation of the authors, , in which the experience of prospecting and exploration and development of deposits at ultra-deep depths (more than 6000 m) was analyzed. Since the industry has accumulated a significant number of successfully implemented ultra-deep projects, it may seem that such projects, in principle, have an increased chance of success. This is not so: when they are implemented, geological, technological and, most importantly, organizational and commercial problems arise even more often than when developing more traditional reserves.</em></p> <p><em>The several non-commercial projects considered in this paper cover almost the entire spectrum of possible cases of various structural and tectonic conditions: foothill depressions and intracraton basins, coasts, offshore and deep-water offshore areas. Stratigraphically, the time interval covers deposits from the Miocene to the Lower Paleozoic (Silurian) and a wide variety of lithofacial complexes. Based on the generalization, a list of possible reasons for making unsuccessful decisions is derived.</em></p>ultra-deep sectionsreservoirspetroleum systemsnon-commercial discoverygeological successсверхглубокие разрезыколлекторыуглеводородные системынекоммерческое открытиегеологический успех