Changes in the composition of formation gases in gas-condensate fields formed by vertical migration
A model was developed for calculating the change in gas composition in the pool during its formation by vertical migration. A conical trap with varying cap-rock thickness was considered. Amputations were made for different thermodynamic conditions, different initial states of the gas entering the trap, and different flow rates. The coefficient of compressibility of the gaseous phase was calculated from the Redlich-Quong equation. The results gave the degree of filling of the trap with gas and its composition as functions of time. It was concluded: (1) one of the main factors determining the composition of the formation mixture in a pool formed by vertical migration was diffusion processes, (2) the data on changes in the composition of the formation gas obtained from the theoretical model of hydrocarbon diffusive dispersion through the caprock was not at variance with the actual patterns noted in gas-condensate fields formed by vertical migration and (3) statistical study of fields in the Dnepr-Donets Basin had established a relationship between the composition of the formation gas and the properties of the caprock. 3 references, 4 figures.
- OSTI ID:
- 6235958
- Journal Information:
- Int. Geol. Rev.; (United States), Vol. 24:12; Other Information: Geol. Neft. Gaza; No. 1, 50-54(1982)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BUTANE
DIFFUSION
ETHANE
GEOLOGIC TRAPS
CHEMICAL COMPOSITION
PENTANE
PROPANE
COMPRESSIBILITY
FLOW RATE
GAS CONDENSATE FIELDS
MATHEMATICAL MODELS
RESERVOIR ROCK
THERMODYNAMICS
ALKANES
GEOLOGIC DEPOSITS
HYDROCARBONS
MECHANICAL PROPERTIES
MINERAL RESOURCES
NATURAL GAS DEPOSITS
ORGANIC COMPOUNDS
PETROLEUM DEPOSITS
RESOURCES
033000* - Natural Gas- Properties & Composition