Classifications of proved, probable and possible reserves have been established to reflect the level of these uncertainties and to provide an indication of the probability of recovery. The determination of oil and gas reserves involves the preparation of estimates that have an inherent degree of associated uncertainty. It is recommended that similar study should be carried out on condensate and oil reservoir, particularly on Niger Delta fields. Therefore, LHS is a good estimator of gas reserve. The calculated recovery factors of 68.7% and 93.3%, for water driven and depletion driven gas reservoirs respectively, compare favourably with those of known gas reservoirs. The accuracy of Latin Hypercube Sampling is analysed by comparing the actual ultimate recovery and the OGIP predicted by LHS.
Lhs latin hypercube sampling software#
The distribution of porosity, water saturation, reservoir thickness and reserve size are input to crystalbal software to generate cumulative distribution function (CDF) and Probability density function (PDF) of original gas in place (OGIP) for each of the fields. This work dwells on analysis of two depleted gas fields for which the ultimate recovery is known.
The parameters used in these distributions are extracted using software "digitizer" from different plot of values derived from measurements of reservoir and fluid properties.
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Latin Hypercube Sampling (LHS), unlike other simulation methods such as Monte Carlo Simulation (MCS), has not enjoyed wide applications in determination of reserve despite its capability to realize same accuracy as with the latter even with much fewer simulation trials.
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