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Applying fluid inclusion mass spectrometry to exploration plays
- Source: First Break, Volume 29, Issue 10, Oct 2011,
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- 01 Oct 2011
Abstract
Fluid inclusions have been used to identify oil charge and migration into the Ungumayo anticline, located in the Marañon Basin, Peru. Sandstone samples recovered from an exploration well drilled into the west flank of the trap (Ungumayo-1X) and from a well in the nearest producing oilfield, the Chambira Este Field, were sent for fluid inclusion analyses. The samples containing fluid inclusions were compared using petrography and fluid inclusion geothermometry to identify the local geological controls on the formation of the different fluid inclusion types identified in the wells. The bulk chemical composition of the volatiles inside the fluid inclusions was obtained using mass spectrometry, with ions being identified from inorganic gases, dry organic gases, water-soluble hydrocarbons, C1 to C13 petroleum compounds, and sulphur compounds. The fluid inclusion mass spectrometry results were interpreted by comparing the abundances of specific hydrocarbon-related compounds and mass spectra between samples from the exploration well and the oilfield. The combination of petrography and fluid inclusion techniques confirms the migration of liquid hydrocarbons into the Ungumayo structure. The fluid inclusion mass spectrometry analysis suggests that the Ungumayo structure still contains a non-biodegraded oil accumulation.