苏北盆地高邮坳陷古新统阜宁组富二段有机岩石学地球化学特征及其页岩油潜力

Hongliang Duan , Zhigang Wen , Yongfeng Qiu , Juan Teng , Taohua He , Shili Liu
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引用次数: 0

摘要

苏北盆地高邮凹陷古新统阜宁组富2段是一个有机质富集的地层,具有较高的页岩油勘探开发潜力。对研究区域一个厚度为257 m的岩芯中的页岩样品进行了总有机碳(TOC)、有机岩石学、岩石蒸发热解、三氯甲烷沥青“A”提取和SARA(饱和物/芳烃/树脂/沥青质)成分分析,以研究有机质(OM)丰富度、干酪根类型、显微组分组成、生烃潜力,富二段含油量。结果表明,研究区富二段页岩在峰值油窗口的Ro为0.87%,表明其生烃潜力很大。页岩中的OM主要属于干酪根II型,少量为I型和III型。微观观察,页岩中的显微组分主要由镜质组、惰质组、褐藻质组和固体沥青组成。所研究的页岩的平均TOC含量为1.41wt%,表明其具有良好的石油潜力。当Tmax用作热成熟度指标时,显微组分的变化可能会影响可靠性。4号页岩下部和5号页岩上部(3650–3700 m)的总有机碳含量高,含油饱和度指数高,被确定为富二段页岩油勘探的最佳井段。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Organic petrography and geochemistry of the Fu 2 member of the Paleocene Funing formation, Gaoyou Depression, Subei Basin, Eastern China: Implications for shale oil potential

The Fu 2 Member of the Paleocene Funing Formation in the Gaoyou Depression, Subei Basin is an organic matter-rich formation, and has a high potential for shale oil exploration and exploitation. Total organic carbon (TOC), organic petrography, Rock-Eval pyrolysis, chloroform bitumen “A” extraction, and SARA (saturates/aromatics/resins/asphaltenes) composition analyses of shale samples from one drill core in the studied area spanning a thickness of 257 m were conducted to study the organic matter (OM) richness, kerogen type, maceral composition, hydrocarbon generation potential, and oil content of the Fu 2 Member. Results show that the Fu 2 Member shales in the study area have a Ro of 0.87%, in the peak oil window, suggesting a high potential for hydrocarbon generation. The studied OM in shales mainly belongs to kerogen Type II, with a minor portion of Type I and Type III. Under microscopic observation, macerals in the studied shales are mainly composed of vitrinite, inertinite, alginite, and solid bitumen. The studied shales have an average TOC content of 1.41 wt%, indicating good petroleum potential. The variations of maceral compositions could affect the reliability when the Tmax is used as an indicator of thermal maturity. The lower Shale 4 and upper Shale 5 interval (3650–3700 m), with high TOC and high oil saturation index, is identified as the sweet-spot interval of the Fu 2 Member for shale oil exploration.

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