Abstract
We present two examples of how pressure-volume-temperature (PVT) analysis of fluid inclusions can be used to evaluate oil compositions, migration timing, trap-fill history, paleopressures, and mechanisms of bitumen formation in petroleum reservoirs. Measurements of homogenization temperatures, volumetric liquid/vapor ratios and API gravities from petroleum inclusions are integrated with PVT simulations to estimate the composition and PVT properties of single petroleum inclusions in the Greater Alwyn-South Brent petroleum system of the North Sea and in the Tengiz field of Kazakhstan. Fluid inclusion data combined with models of burial history and petroleum migration yield the timing of petroleum emplacement. Key conclusions are: (1) analysis of six North Sea fields suggests that changes in petroleum compositions through time can be interpreted in terms of gradual mixing of earlier reservoired oil with later migrated, more mature and gas-rich fluids; and (2) depressurization within the Tengiz reservoir is suggested to cause asphaltene/bitumen dropout, particularly as the pressures approach the bubble point of the oil.
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