Saint Petersburg 2018
Innovations in Geosciences – Time for Breakthrough
Tight and Unconventional Oil Reserves: Definitions, Calculation and Development Specifics
Monday 9 April (09:00 – 13:00)
The definitions of hard-to-recover petroleum reserves in general and tight oil in particular still remain a subject of discussions among petroleum geologists and oilfield engineers. Neither there is unanimity about the ways to evaluate these reserves, leaving aside the development strategies. Even the key concepts of oilfield geology and fluid dynamics appear debatable when applied to unconventional resources. For instance, speaking about oil accumulation in a reservoir, such terms as accumulation or pool meaning oil sealed in a formation, or reservoir meaning a body commonly modeled in terms of its porosity and permeability, become poorly applicable in their strict sense. Furthermore, the simulators used currently in fluid dynamic modeling are invalid for tight oil which most often resides in ultralow-permeable rocks where it ceases to be a true Newtonian fluid obeying the Darcy law. The cited examples are just a tip of the iceberg, that of dramatic difference in exploration and production approaches for unconventional (tight) and conventional oil. Therefore, it is critical to address investigation and handling of new hydrocarbon resources as a special line of basic research, with reference to experience and achievements gained in allied sciences.
Igor V. Shpurov, Doctor Sci. (Engineering); Director General, State Commission on Mineral Resources (FBU GKZ); first vice-chairman, Central Commission for Design Approval in Oil Development of the Russian Subsoil Use Federal Agency (Rosnedra, CKR UVS); first vice-chairman, Resource Classification Bureau of the United Nations Economic Commission for Europe (UNECE).