An experimental study was performed to evaluate the effect of heat-up to various low temperatures on vitrinite reflectance (VR) at 2 kbar employing the same previously used heat-up procedures, starting material and apparatus. Heat-up is the isobaric experimental procedure consisting of the increase in temperature of the laboratory vitrinite maturation from room temperature to the desired run temperature T-end (of heat-up) at which the isobaric-isothermal maturation starts. Experiments employed cold-seal pressure vessels with classical heat-up devices and were carried out on wet (water added) xylite of swamp cypress. Confined system maturation experiments were conducted at 2 kbar and involved temperatures T-end (of heat-up) 200, 300 and 400 degrees C. Heat-up times were similar to 25 min at 200 degrees C, similar to 35 mm at 300 degrees C and similar to 40 min at 400 degrees C. Results of this study demonstrate that heat-up has a strong influence on VR at 2 kbar for rid of heat-up above similar to 250 degrees C: VR greatly increases with Tend of heat-up during the short heat-up event. This effect of heat-up points out the rapid kinetics of the initial VR increase. At 2 kbar, experimental heat-up to Tend of hear-up

Keywords:Textinite;Vitrinite;Vitrinite reflectance;Experimental maturation;Cold-seal pressure vessel;Heat-up effect