Influencing factors of the Tmax parameter in Rock-Eval pyrolysis

Abstract

The rock pyrolysis parameter Tmax is an important index to evaluate the maturity of organic matter in source rocks. However, during the use of Tmax, it is found that the Tmax value of some samples does not conform to the thermal evolution law of organic matter when evaluating the maturity of organic matter, which affects the accuracy of geological applications. Studying the influencing factors of the rock pyrolysis parameter Tmax analysis data is beneficial to improve the experimental method to ensure the accuracy of the experimental data, and it is of great significance to the correct evaluation of the source rock type and maturity of the source rock. In this paper, the effects of sample mixing uniformity, sample weight, soluble organic matter and minerals on the rock pyrolysis parameter Tmax are analyzed experimentally. It is concluded that the degree of sample uniformity and the amount of sample will affect the results. Soluble organic matter will lead to a decrease in Tmax. With the change of kerogen/clay mineral ratio, the influence of clay mineral on the pyrolysis parameter Tmax.