摘要
卟啉化合物在江汉、泌阳两盆地中的分布,受沉积环境及热成熟作用的控制。五元侧环上具有甲基的C_(32),C_(33)DPEP卟啉异构体在石油中的高丰度指示了一种出现在较高盐度环境中特殊生源前体以及低成熟度。在热成熟作用下,卟啉化合物的主要变化为DPEP的逐渐消失及ETIO中脱烷基及烷基化作用。DPEP/ETIO或DPEP/(DPEP+ETIO),C_(31)ETIO-A/C_(28)ETIO-B及ETIO-AC_(31)/C_(30)等比值可用作热成熟度指标。
The distribution of porphyrin in oils from Jianghan and Biyang Basins, China, wasstudied. The high contents of C_(32) and C_(33) DPEP porphyrin isomers with a additionalmethyl group in five-membered isocyclic ring is the indicator of an unusual type of por-phyrin precusor or input occurred in sedimentary environment with very high salinity andlow maturity of oils. The major changes of porphyrins under maturity are the gradual de-creases of DPEP/(DPEP+ETIO)% and dealkylation/alkylation within ETIO por-phyrins. The ratios of DPEP/ETIO or DPEP/ (DPEP+ETIO)%, C_(31) ETIO-A/C,, ETIO-B and ETIO-A C_(3)/C_(30) can be used as thermal maturity parameters.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1991年第2期136-142,共7页
Oil & Gas Geology
