Determination of hydrocarbon accumulation stages using fluorescence spectrum of hydrocarbon inclusions:A case study of Sinian Dengying Formation in central Sichuan paleo-uplift area
Micro-fluorescence spectroscopy technology of fluid inclusion is a research method used to study the fluorescence properties of inclusions to determine the fluid properties,chemical composition,and formation stages of inclusions.Uses the techniques of microscopic fluorescence spectroscopy analysis of hydrocarbon inclusions and inclusion temperature measurement to analyze the Sinian accumulation stages of Dengying Formation in the central Sichuan paleo-uplift area.Through experimental detection,it was observed that there are three fluorescent colors of hydrocarbon inclusions in Dengying Formation reservoir,namely orange,yellow-green,and blue-white,indicating the change from low to high maturity of the charged oil in inclusions.Based on the microscopic fluorescence spectrum parameters,the homogeneous temperature measurement analysis of the inclusions,and the burial hydrocarbon generation history,it is concluded that Dengying Formation reservoir in the study area have undergone three stages of hydrocarbon charging.The charging time of the low maturity oil with orange fluorescence in the first stage is from the Silurian to the Late Devonian.The charging time of the medium maturity oil with yellow-green fluorescence in the second stage is about the Early Triassic to the Early Jurassic.The charging time of the high maturity oil and gas in the third stage is about the Late Jurassic to the Early Cretaceous.The first and second stages are mainly crude oil charging,and the third stage is the formation of gas reservoirs by cracking gas in ancient reservoirs.This research result is consistent with the conclusions of previous researchers on the oil and gas accumulation stages divided based on tectonic movements and the homogeneous temperature of inclusions in the study area and also has important guiding significance for further oil and gas exploration work in the central Sichuan region.
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