Zhang Donglin, Tang Youjun, Li Hongbo, Xu Tianwu, Zhang Yunxian, Zhang Chengfu, Huang Yahao, Wang Ting
Hubei Key Laboratory of Petroleum Geochemistry and Environment (Yangtze University), Wuhan 430100, China.
Sinopec Zhongyuan Oilfield, Puyang, Henan 457001, China.
ACS Omega. 2021 Jul 1;6(27):17400-17412. doi: 10.1021/acsomega.1c01688. eCollection 2021 Jul 13.
The measured composition and distribution of methyltrimethyltridecylchroman (MTTC) compounds in the crude oils from Wenliu (salt-rich zone) and Machang (salt-free zone) areas of the Dongpu Depression were correlated with redox conditions and paleosalinity. The oil samples derived from the mesosaline environment were found with all alkylated MTTC series present. In addition, the dimethyl MTTCs developed more favorably in the oils derived from a relatively reducing and hypersaline environment (Wenliu) compared to those from the fresh lacustrine settings (Machang), while the trimethyl MTTCs developed more favorably in the fresh water environment (Machang). Determination of the oil maturity in the "oil window" by a series of aromatic maturity indicators suggests that MTTC compounds are not only present in immature or low-mature oils but also distributed in mature oils. Therefore, the "low-mature" oil found with abundant MTTC compounds, especially derived from the saline lacustrine settings, should be assessed with caution.
对东濮凹陷文留（富盐区）和马厂（无盐区）原油中甲基三甲基十三烷基苯并二氢吡喃（MTTC）化合物的测定组成和分布与氧化还原条件及古盐度进行了关联。发现源自中盐度环境的油样中存在所有烷基化的MTTC系列。此外，与来自淡水湖泊环境（马厂）的油相比，二甲基MTTC在源自相对还原和高盐环境（文留）的油中发育更有利，而三甲基MTTC在淡水环境（马厂）中发育更有利。通过一系列芳烃成熟度指标测定“油窗”内的油成熟度表明，MTTC化合物不仅存在于未成熟或低成熟油中，也分布于成熟油中。因此，发现含有大量MTTC化合物的“低成熟”油，尤其是源自盐湖环境的，应谨慎评估。
