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为探究温度和压力对烃源岩高温高压热模拟产物产率的影响,利用WYNN-3型高温高压(HTHP)模拟仪对辽河盆地桃10井Ⅲ型有机质的炭质泥岩进行了半开放体系的生烃、排烃热模拟实验。通过进行温控系列(T—t)和温压共控系列(P—T—t)2种方式350℃、400℃、450℃、500℃、520℃和540℃6个温度点的慢速升温热模拟实验。结果发现生烃模拟产物分别在T—t和P—T—t系列的500℃和450℃出现单位样品产率的低点。而分别在2个系列的520℃和500℃出现了模拟气态烃(39.452mg/g和27.697mg/g)和总烃产物产率(51.784mg/g和52.395mg/g)的最大值;并且此温度阶段之后,2种模拟方式实验样品单位产率出现降低趋势。从2个系列排出油、气态烃、总油、总烃单位样品产率和生排烃演化模式的对比中可以发现,压力对Ⅲ型有机质烃产物的生成起到一定的促进作用。同时,实验结果展示的有机质演化过程与传统沉积质演化与油气生成模式有一定的重复性和相似性,一方面展示了实验的可行性与重要性,另一方面也表征了烃源岩在实际地质演化过程中可能出现的复杂的演变特征。为研究评价盆地或凹陷烃源岩的生烃潜力提供了一定的理论指导意义。
In order to explore the influence of temperature and pressure on the yield of thermal simulation products of high temperature and high pressure in source rocks, the carbonaceous mudstone of type III organic matter in Tao 10 well of Liaohe Basin was semi-open system using WYNN-3 high temperature and high pressure (HTHP) simulator Hydrocarbon generation and expulsion heat simulation experiment. Through the temperature control series (T-t) and temperature and pressure control series (P-T-t) 2 kinds of ways 350 ℃, 400 ℃, 450 ℃, 500 ℃, 520 ℃ and 540 ℃ 6 slow temperature Heating simulation experiment. As a result, it was found that the hydrocarbon generation simulation product showed the low of the unit sample yield at 500 ° C and 450 ° C of the T-t and P-T-t series, respectively. While the maximum values of simulated gaseous hydrocarbons (39.452 mg / g and 27.697 mg / g) and total hydrocarbon product yields (51.784 mg / g and 52.395 mg / g) were present at 520 ° C and 500 ° C, respectively, for the two series; and After this temperature stage, the unit yield of the two simulated experimental samples showed a decreasing trend. Comparing the sample yield of two series of discharged oil, gaseous hydrocarbon, total oil, total hydrocarbon unit and evolution of hydrocarbon generation and expulsion, it can be found that pressure can promote the generation of Ⅲ organic hydrocarbon product. At the same time, the experimental results show that the evolution process of organic matter has certain repeatability and similarity with the traditional sedimentary evolution and hydrocarbon generation model. On one hand, the feasibility and importance of the experiment are demonstrated. On the other hand, The complex evolutionary features that may arise during geological evolution. It provides some theoretical guidance for the study of hydrocarbon generation potential of basin or sag source rocks.