Abstract
Abstract Biodegraded oils from the northern slope of the Biyang Sag were analyzed to examine the application of tricyclic terpanes to biodegraded oil-source correlation. Tricyclic terpanes are resistant to biodegradation ( biodegradation rank 8) . New tricyclic terpane parameters, such as (C23-C26/Cl9-C22)-tricyclic terpanes, (Cl9-C26/ C28-C29)-tricyclic terpanes and (C19-C26)-tricyclic terpanes/C29-Ts are effective oil-source correlation parameters. Correlation results suggested that the biodegraded oils in the lower member of Eh 3 on the northern slope of the Biyang Sag came from the mudstones in the lower member of Eh 3 of the central sag, and the oils in the upper member of Eh 3 mainly came from the mudstones in the upper member of Eh 3 of the central sag. The correlation results of oils and source rocks in the Zhu I Depression of the Pearl River Mouth Basin determined by the three tricyclic terpane parameters were consistant with previous results, further supporting the effectiveness of the parameters.
Highlights
Biodegraded oils from the northern slope of the Biyang Sag were analyzed to examine the application of tricyclic terpanes to biodegraded oil⁃source correlation
尤其是 C23 ~ C26 - 三 环 萜 烷, 而核三上亚段油源 C19 ~ C22 -三环萜烷的相对含量较核三下亚段油源 高。 油源对比结果表明,泌阳凹陷北部斜坡带核三 上亚段生物降解油主要来自深凹区核三上亚段泥 岩,核三下亚段生物降解油主要来自深凹区核三下 亚段泥岩。 3.2.2 其他证据
本文建立的三环萜烷参数,如 C23 ~ C26 / C19 ~ C22 -三环萜烷、C19 ~ C26 / C28 ~ C29 -三环萜烷及 C19 ~ C26 -三环萜烷 / C29 -Ts 等同样适用于珠I坳陷油源 对比研究(图 8c,d)。 这些三环萜烷参数确定的油
Summary
Biodegraded oils from the northern slope of the Biyang Sag were analyzed to examine the application of tricyclic terpanes to biodegraded oil⁃source correlation. 要来自北部斜坡带,泥岩样品主要来自中部深凹带 ( 图 1,表 1,2) 。 泌阳凹陷原油主要为正常原油和 稠油( 以生物降解油为主) ,前者主要分布在双河、 下二门、梨树凹、安棚等油田,后者主要分布在古 城、井楼、杨楼和新庄等油田。 正常原油密度介于 0.84 ~ 0.91 g / cm3 之间,平均为 0.88 g / cm3,黏度普 遍小于 100 mPa ·s;生物降解油密度介于 0.
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