摘要
辽东湾北部的JZ20-2构造富产凝析油。正常原油一般产于凝析油下部。凝析油中不含胶质和沥青质,在轻质组分中(C<10)链状饱和烃含量为57％,环烷烃为35％。GC-MS分析表明倍半萜和三环双萜含量十分丰富,其母质为陆地植物与藻类的混合物。天然气包括凝析气、溶解气和少量游离气。这些气体是凝析油的伴生气。根据生物标志物的对比,认为凝析油来自于构造东部的辽中拗陷内高熟的泥岩。其中有机质类型是腐泥-腐殖型。JZ20-2构造中的凝析油表明它可以形成于不同的成熟阶段。含有腐殖型有机质的生油岩可以在R_0=1.0～1.3的阶段形成凝析油。
The JZ20-2 structure located in the north of Liaodong Bay is rich in con-densate. The normal crude oil generally exist beneath the condensate. There is no resin and asphaltene in the condensate, but 57% chain alkane and 35% cycloal-kane exist in light fraction ( C<10 ) . GC-MS analysis shows that sesquiterpane and tricyclic diterpanes are very abundant. The composition of the condensate indicates that the precursor is the mixture of continental plants and algae. The gas includes condensate gas, dissolved gas and a small amount of free gas. These gases are the associated ones of the condensate oil. According to the correlation of biomarkers, the condensate comes from the high mature mudstone in the Liao-zhong depression in the east of this structure. The type of organic matter may be the sapropel-humics. The condensate in the JZ20-2 structure indicates that the condensate may be formed in the different mature stages. The source rock which contains the humic organic matter can generate condensate in the stage of R0 = 1.0 ~ 1.3.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1990年第1期1-8,共8页
Earth Science-Journal of China University of Geosciences
关键词
凝析油
成因
生物标志物
成熟度
condensate, biomarker, sesquiterpane, tricyclic ditcrpane, 4- me thylsterane, maturity, Bohai bay.
