OALib Journal期刊
ISSN: 2333-9721
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半开放体系下温压对烃源岩hthp模拟产物产率的影响
Keywords: 热模拟,半开放体系,温控,温压共控,生烃产率,生烃演化
Abstract:
?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。
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