Evolution of natural gas composition: A three dimensional modeling for genesis, expulsion, migration, trapping
- Indiana Univ., Bloomington, IN (United States)
Natural gas enrichment and contamination is economically important for resource assessment and production. It involves a number of complex phenomena arising through the coupling of reaction and transport processes. Gas purification or contamination by CO[sub 2], H[sub 2]S, N[sub 2] or other non-petroleum constituents may result from the interaction of natural gas with iron oxide or other mineralization or through reactions among fluid species themselves. This may occur during generation, migration or while in situ in the reservoir. In this study, we have investigated these phenomena through quantitative reaction-transport modeling to provide a method that will allow for better evaluation of economic resource potential and for the identification of key factors needed for predicting gas quality. Our test problem consists of coupling nonlinear phenomena associated with the genesis, expulsion, migration and trapping of petroleum. These phenomena include the oxidation of HS and methane by iron oxide mineralization. The coupling includes multiphase flow and permeability altering diagenetic reactions, destruction of seals and episodic leaking of petroleum from a reservoir. Our model is fully 3-dimensional and accounts for relative permeability, capillary and inter-extra phase, organic and inorganic reactions as well as spontaneous creation or destruction of phases (gas, aqueous, oil, CO[sub 2]-rich).
- OSTI ID:
- 6566823
- Report Number(s):
- CONF-960527-; CODEN: AABUD2
- Journal Information:
- AAPG Bulletin, Vol. 5; Conference: Annual convention of the American Association of Petroleum Geologists, Inc. and the Society for Sedimentary Geology: global exploration and geotechnology, San Diego, CA (United States), 19-22 May 1996; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NATURAL GAS
CHEMICAL COMPOSITION
MIGRATION
PRODUCTION
NATURAL GAS DEPOSITS
ORIGIN
GEOLOGIC TRAPS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
GEOLOGIC DEPOSITS
MINERAL RESOURCES
RESOURCES
030200* - Natural Gas- Reserves
Geology
& Exploration
033000 - Natural Gas- Properties & Composition