Evidence for post-cementation migration of high-temperature, high-pressure fluids - Siluro-Devonian Helderberg group, central Appalachians
Fluid inclusion data and fracture-filling cements in carbonate and siliciclastic rocks of the Siluro-Devonian Helderberg Group, central Appalachians, indicate post-cementation, late Paleozoic migration of high-pressure, high-temperature fluids. Well-cemented sandstone and limestone have multiple crosscutting trains of secondary hydrocarbon inclusions. Some trains crosscut cement-filled fractures. Hydrocarbons also occur as thin films along cement crystal boundaries and as secondary inclusions trapped along calcite deformation twins. These inclusions indicate geopressured fluids moved along intercrystalline boundaries and along deformation twin planes in calcite under deep burial conditions either during or after deformation.
- Research Organization:
- Viriginia Polytechnic Inst. and State Univ., Blacksburg
- OSTI ID:
- 6571645
- Report Number(s):
- CONF-8405216-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 68:4; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Regional distribution of hydrocarbon fluid inclusions in carbonate fracture filling cements: geohistory analysis and timing of oil migration, Oman foredeep
Petrographic and geochemical evidence for regional fluid and hydrocarbon migration associated with Late Paleozoic tectonism: Upper Knox Group, Appalachians