Abstract: Based on the previous research, the author made extensive analysis and application appraisements are made about a new material balance method of super high-pressure oil (gas) reservoirs to calculate reserves and predict performance. Differ from the traditional material balance; this method needs no restrictions on fluid composition, pressure gradient, water influx or constant pore volume assumption. Especially, the new method accounts for volatilized-oil and retrograde condensate. Through bringing in the volatilized-oil and oil-gas phases equilibrium calculation, it is applicable to the full range of fluids, including ordinary reservoirs, volatile-oils and super high pressure gas condensate reservoirs. By means of case study, it is proved to be adaptable and accurate to super high pressure condensate reservoirs.

Key words: material balance, abnormal pressure, gas condensate reservoirs, reserves estimation