黄骅坳陷中北区沙三段烃源岩热压模拟实验及其压力的影响

SOURCE ROCKS HEAT-PRESS SIMULATION EXPERIMENT AND ITS INFLUENCE WITH PRESSURE IN THE MEMBER 3 OF THE SHAHEJIE FORMATION, MIDDLE-NORTH AREA OF HUANGHUA DEPRESSION

热压模拟实验是研究烃源岩生烃能力最直接的方法.该文分别选取黄骅坳陷中北区板桥、歧口和北塘凹陷第三系沙三段烃源岩样品进行热压模拟实验,分析和对比了生烃产物、油气产率和相态特征.结果表明黄骅中北区沙三段烃源岩的生烃能力都较高,最大总产烃率可达300～350 kg/t.板桥凹陷深层烃源岩在成熟-高成熟阶段主要生成凝析油气,北塘凹陷和歧口凹陷深层烃源岩在成熟阶段主要生油,高成熟阶段主要生成凝析油气.同时,通过实验压力的改变探讨了压力对生烃产率、生烃产物组成和相态的影响,阐明超压作用改变了传统的生烃模式,使油相出现和存在的深度、范围增大,扩大了找油领域.

The heat-press simulation experiment is the most direct method for studying the ability of hydrocarbon-generating in source rock. This paper selects by examinations respectively three rock samples in the Member 3 of the Shahejie Formation of Banqiao, Qikou and Beitang Depression to do the heat-press simulation experiments, analyzing with contrasted to the hydrocarbon outcomes, the oil-gas production rate and its phase characteristic. The result shows that three source rocks are all the highly ability of hydrocarbon generating, the biggest hydrocarbon-generating rate can amount to 300-350 kg/t. The source rock in deep of Banqiao Depression mainly produces condensation oil-gas during mature-high mature stage, while the source rock in deep of Qikou and Beitang Depression pruduces oil during mature stage, and produces condensation oil-gas during high mature stage. On the experiment, by changing the experiment pressure to study its influence on hydrocarbon-generating rate and outcome constitution and hydrocarbon generating phase. In the end, the author clarified that superpressure changes the traditional hydrocarbon-generating mode, enlarging depth and scope of existing oil phase, and extending frontier areas to look for oil.