加水热模拟实验气态产物特征及演化规律研究

THE STUDY ON THE CHARACTERISTICS AND EVOLUTION REGULARITY OF PRODUCT OF GAS UNDER PYROLYSIS SIMULATION EXPERIMENTS.

本文采用低温长时间加水热模拟实验方法，对东濮凹陷卫城地区下第三系低熟泥灰岩进行生、排烃实验研究，系统分析了气体的组成、产率变化特征及其成因，为定量评价不同演化程度的泥灰岩生气量提供了科学依据。对比了模拟实验结果与自然演化剖面的甲烷碳同位素变化异同，揭示了干酪根热降解生气的过程和机理。

Based on the hydrous pyrolysis simulation experiments of the low-mature muddy limestone, the characteristics of products of gas are discussed systematicall in this paper. During thermal evolution, 1. the yield of mathane increase, while that of heaVy hydrocarbon gas (CZXS) increase at first, then decrease later, this phenomenon reflects the further pyrolysis of heaVy gas in high evolution stage. 2. the existance of the certain amount of alkene gas is due to the shorter reaction take which results that the reaction didn't take place wholely. 3. the yield of hydrogen increase, especially in high evolution stage, thes is related to the further pyrolysis and coked of heaVy hydrocarbon. 4. the yield of CO2 increase at first, then keep a content. This kind of CO2 is organic genesis and come from the carboxyl or carbonyl of kerogen, and this kind of reaction take place in early evolution stage 5. the value of δ13C of mathane become lighter at early stage and heavier at last stage. The phenomenon was controlled by two factors: one is the primary distribution of carbon-isotope and the other is isotopic distilled effects during thermal evolution.