The article is dedicated to the development methods of hydrocarbon gigantic fields of the Peri-Caspian Depression. The flooding of the fields underlaid by bottom waters can lead to the occluding of bypassed gas layers because of good permeability of the fissure zones of the carbonate reservoir and fast water migration into the productive stratum. The volumes of these gas layers are compatible with the initial reserves of the middle gas field. The flooding can also lead to the necessity of constructing the toxic bottom water disposal polygon. The authors study the gigantic fields of the Peri-Caspian depression basing on the experience of development of such large fields as the Astrakhanskoe gas condensate field and also the Orenburgskoe gas condensate and other fields. The analysis is targeted to selection of a rational method for the development of gigantic oil and gas fields. The area of its application is the development of fields confined to carbonate reservoirs and the environment protection during development of these fields. Based on the performed study, the authors state that the conservation of watering-out wells as the main channels for bottom waters penetration in the productive stratum will avoid the necessity of construction of the toxic bottom water disposal polygon and to prevent the occluding of bypassed gas layers, and also the intensive degasification of saturated bottom waters with the H2S emission and the environment contamination.
Keywords: GIGANTIC FIELDS, CARBONATE RESERVOIR, BOTTOM WATERS, WATER MIGRATION, FIELD FLOODING PROBLEM, DEVELOPMENT METHOD, WATERING-OUT WELL CONSERVATION.