Experimental analysis on heating of oil inclusion in Gucheng area of East Tarim

Abstract

In this paper, the formation and preservation conditions of crude oil cracking gas reservoirs are analyzed by heating experiments of oil inclusions. The study of tectonic development history shows that Gucheng low uplift mainly undergoes three evolutionary stages: early extension, middle uplift and late subsidence. Up to the end of Devonian and early Hercynian, the southeastern Altun compression resulted in warping plate uplift and denudation in Gucheng area, with denudation thickness of about 1000-2800m.The experimental results show that no inclusion rupture occurs during the whole process of heating to 600?.It was observed that the phase state of inclusions changed obviously during heating process, and the fluorescence of inclusions weakened obviously after natural cooling, reflecting the cracking process of crude oil. The results of high resolution laser-raman spectrum measurements of oil inclusions after heating experiments show that methane is the main component of gas inclusions, while carbon dioxide is small. According to the microscopic comparison of oil inclusions before and after heating, it is inferred that the sample has not undergone this high temperature process. Theoretically, it is assumed that oil and gas inclusions will rupture when heated to a certain temperature. It is possible that this experiment did not reach the limit temperature of inclusion rupture.