有机酸盐热模拟产物中芳烃馏分特征及其地质意义

为了研究有机酸盐生烃演化特征，对有机酸盐进行了270℃、320℃、360℃、400℃和430℃一系列温度点的热模拟，实验结果表明，有机酸盐会大量转化为酮系列化合物，酮化合物最大产率阶段为320℃到360℃，其中360℃时产率最高，其转化率可达有机酸盐加入量的39%，400℃后产率急剧下降。这表明脂肪酸镁向酮系列化合物的最大转化温度段稍早或一致于有机质大量生烃阶段，但该类化合物对热较敏感，高温下不易保存，因此酮作为评价有机酸盐生烃贡献强度的指标只能适合于中—低温演化阶段的烃源岩。

The Geological Significance and Characteristics of Aromatic Fraction during Organic Acid Salt Generating Hydrocarbon

In order to study on the evolution of hydrocarbon generation by organic acid salt, pyrolysis experiment is taken on organic acid salt at a series of temperature point 270℃, 320℃,360℃, 400℃ and 430℃. The experimental result indicates that organic acid salt can be largely produced into ketone compounds. The threshold temperature of larger quantity yield is between 320℃ and 360℃ and the peak production rate at 360℃, where the conversion rate of the organic acid salt reaches 39%. But beyond the 400℃ the production rate rapidly declines. This result suggests that magnesium salt converses into ketone at the lower temperature or same as that of hydrocarbon generation. But this type of compounds is sensitive to thermal, so it is difficult to preserve at higher temperature. Therefore, as the index of estimating hydrocarbon generation by organic acid salt, the index of ketone is generally only suitable for the middle low maturity hydrocarbon source rocks.