低熟烃源岩的超强混合溶剂抽提及其地球化学意义

MIXED SOLVENT EXTRACTION OF IMMATURE SOURCES AND ITS GEOCHEMICAL SIGNIFICANCE

将一种新的、具有超强抽提能力的二硫化碳与N 甲基 2 吡咯烷酮混合溶剂 (CS2 NMP)用于抽提低熟烃源岩有机质 ,并将抽提结果与氯仿抽提、甲醇丙酮氯仿三元混合溶剂抽提进行了比较。研究结果表明 ,CS2 NMP混合溶剂在不破坏有机质化学结构的情况下对低熟烃源岩有机质有很强的抽提能力 ,是氯仿抽出量的 2～ 9倍 ,对部分低熟烃源岩有机质的抽出量达到 70 0mg/g以上。异常高的有机质抽出量表明 ,低熟烃源岩有机质中含有丰富的非共价键缔合结构 ,这对有机质演化有重要意义。

A new and powerful mixed solvent of carbon disulfide and N\|methyl\|2\|pyrrolidinone (CS 2 NMP) was used in extraction of immature source rocks. Chloroform and ternary mixed solvent of methanol\|acetone\|chloroform were also used as extraction solvents for comparison. Very high extraction yields are obtained and no chemical reactions produced during the CS\-2\|NMP extraction. The mixed solvent extraction yields are 2 to 9 times of the chloroform extraction yields, and more than 700 mg/g extracts are obtained from some immature source rocks. It is suggested that the structures of the sedimentary organic matter should be reconsidered.