Successive, Isothermal Hydrocarbon Migration Events Recorded by Fluid Inclusions in Fracture-Filling Quartz of the Szeghalom Dome (SE Hungary) | Szegedi Tudományegyetem, Ásványtani, Geokémiai és Kőzettani Tanszék

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Mai névnapok:

Emil, Csanád

Successive, Isothermal Hydrocarbon Migration Events Recorded by Fluid Inclusions in Fracture-Filling Quartz of the Szeghalom Dome (SE Hungary)

Reference:
Acta Mineralogica-Petrographica, Szeged 2003, Vol. 44, pp. 9-17

Szerző:
Dr. Schubert Félix
Dr. M. Tóth Tivadar

Abstract:
The largest sub-basin in the south-eastern part of the Pannonian Basin is the Békés Basin (BB). The BB is surrounded by metamorphic and magmatic basement highs, which produce considerable amount of petroleum due to their high fracture porosity. One of the most intensively explored basement highs is located on the northern margin of the BB, called Szeghalom Dome (SzD). Former studies revealed remnants of an ancient hydrocarbon migration event preserved as fluid inclusions in the fracture-filling, idiomorphic quartz crystals of the SzD. This quartz phase occurs in 6 wells in the central part of the dome. The several growth zones suggest that the quartz phase is the product of a successive cementation process. Two markedly different petroleum inclusion types could be distinguished along the growth zones characterised by different colours, vol. % of the gas phase and fluorescence emission. Simultaneously with the HC inclusions also aqueous inclusions occur in lower quantity and rather unequal spatial distribution. The appearance of the different petroleum inclusions shows a well-defined temporal and spatial distribution during the HC-bearing fluid migration in the SzD. Based on co-genetic aqueous inclusions the quartz cementation preceded at isothermal conditions and decreasing salinity, while the HC-bearing fluid turned into a lower density (higher maturity?) type.

 

Letöltés

 

acta2003, fluid inclusion, fracture-filling minerals, metamorphic basement, microthermometry, Pannonian Basin, petroleum migration

 

 




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