Valuation of NGH Deposits
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Valuation of a natural gas hydrate (NGH) deposit is concerned with determining the amount of natural gas that can be technically extracted from a deposit. NGH will rarely occupy all porosity, probably topping out at 80 % or slightly greater of available pore fill. NGH may also be patchy because of both variable porosity and permeability in the reservoir, and from inconsistent mineralization. There are different ways to value a NGH deposit, (1) reservoir analysis, which is an analog of valuing a conventional gas deposit, (2) 3D body analysis based on high resolution seismic data, and (3) cell analysis, which is an analog of conventional economic geology exploration. In addition to an estimate of gas-in-place, estimates for technical recovery must be made. It is likely that a number of the NGH deposits that will be discovered will occur in discontinuous volumes that are not completely hydraulically linked initially through their pore water because of discontinuous impermeable shale beds and lenses. It should be noted that NGH in place may not be technically recoverable gas in place. Where production wellbores cannot link some NGH volumes, the gas has to be discounted from the valuation figure.
KeywordsGas-in-place Petrogenesis Permeability Mineralization grade Cell valuation Seismic response Creaming curve
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