摘要
对辽河断陷盆地内陆湖泊相下第三系沙三下部地层进行了研究，认为在此地层中碳酸盐δ１３Ｃ严重正异常，并根据其特定的地质背景，进行了成因探讨．结果表明，沉积有机质经成岩演化后生成油气经历了成岩作用、深成作用和变质作用三个阶段．在成岩作用阶段，地质聚合物丢失部分１３Ｃ同位素，在深成作用阶段残余母质中相对富集１３Ｃ，变质阶段生成甲烷的δ１３Ｃ值增大．同时还提出了与有机质分解油气生成有关的孤立封闭盆地δ１３Ｃ异常成因模式．
High positive δ 13 C anomaly of Eogene sequence carbonates in Liaohe fault depression was studied. According to specific geologic backeground, possible genesis of high positive anomaly was discussed. The result shows that the generation of oil and gas from organic material after diagenetic evolution has three stages. The values of δ 13 C changed in every stage. A positive anomalous origin model of isolated basin was proposed. The mode has a relation to the process of organic material decomposition and oil or gas formation.
出处
《石油大学学报（自然科学版）》
CSCD
1997年第1期15-17,共3页
Journal of the University of Petroleum,China(Edition of Natural Science)
关键词
湖相盆地
第三纪
碳酸盐矿物
油气藏成因
Lake basin
Tertiary period
Carbonate mineral
δ 13 C positive anomaly.
