塔里木盆地古城墟隆起顺南1井古油藏热裂解过程的分子碳同位素地球化学记录

孙永革; 孔丽姝; 路清华; 顾忆

doi:10.11781/sysydz202305904

塔里木盆地古城墟隆起顺南1井古油藏热裂解过程的分子碳同位素地球化学记录

doi: 10.11781/sysydz202305904

孙永革^{1, 2,},
孔丽姝²,
路清华¹,
顾忆¹

1.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
2.
浙江大学地球科学学院有机地球化学研究组, 杭州 310027

基金项目:

国家自然科学基金 42030803

详细信息

作者简介:
孙永革(1969—), 男, 博士, 教授, 本刊编委, 从事有机地球化学研究。E-mail: ygsun@zju.edu.cn

中图分类号: TE135
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出版历程
- 收稿日期: 2023-07-24
- 修回日期: 2023-09-14
- 刊出日期: 2023-09-28

Molecular carbon isotopic geochemistry records of thermal cracking in the palaeo-reservoir of well Shunnan 1 in Guchengxu Uplift, Tarim Basin

SUN Yongge^{1, 2
,},
KONG Lishu²,
LU Qinghua¹,
GU Yi¹

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2.
Organic Geochemistry Unit, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang 310027, China

摘要

摘要: 塔里木盆地古城墟隆起顺南1井高成熟度轻质原油被认为是典型的热裂解残余油。研究揭示顺南1井原油中高丰度的苯系物和丰富的稠环芳烃，是其在地质历史上经历强烈热裂解的次生产物之一；苯系物应为热裂解、环化、芳构化过程的中间产物，而稠环芳烃可能指示了缩聚过程。烃类分子裂解—缩聚过程诱发的碳同位素分馏，不仅使顺南1井原油正构烷烃分子碳同位素较下古生界含油气系统中正常原油的重8‰~10‰，而且烷基萘系物分子碳同位素也比下古生界含油气系统中的正常原油重6‰~8‰。研究结果进一步实证了与裂解成因相关的芳烃分子及其稳定碳同位素组成是判识深层—超深层油藏是否经历热蚀变的有效手段，其对于准确评估深层—超深层油气相态与资源格局具有重要意义。
- 分子碳同位素 /
- 油气地球化学 /
- 热裂解 /
- 古油藏 /
- 古城墟隆起 /
- 塔里木盆地
Abstract: The highly mature light oil from well Shunnan 1 in the Guchengxu Uplift, Tarim Basin is considered to be a typical residual oil by thermal cracking. The study reveals that the abundant monoaromatic hydrocarbons and polynuclear aromatics in the crude oil of well Shunnan 1 are the by-products of severe in-reservoir oil-cracking during the geological history. The monoaromatic hydrocarbons are the intermediate products of thermal cracking, cyclization and aromatization, while the polynuclear aromatics are indicative of polycondensation reaction. The strong carbon isotopic fractionation induced by hydrocarbon molecule cracking and polycondensation makes the molecule carbon isotope of n-alkanes and the molecule carbon isotope of alkyl naphthalenes in the crude oil of well Shunnan 1 respectively 8‰-10‰ and 6‰-8‰ heavier compared to those from unaltered crude oils in Lower Paleozoic oil-bearing system. The results further proved that the aromatic molecules related to oil cracking and their stable carbon isotopic compositions could be a potentially powerful tool to identify whether thermal alteration occurred in deep and ultra-deep oil reservoirs, and further helps to effectively evaluate the oil and gas phase and resource pattern in the deep and ultra-deep reservoirs.
- molecular carbon isotope /
- petroleum geochemistry /
- thermal cracking /
- palaeo-reservoir /
- Guchengxu Uplift /
- Tarim Basin
注释:

1) 所有作者声明不存在利益冲突。

1) 利益冲突声明/Conflict of Interests

2) 作者贡献/Authors’Contributions

2) 孙永革和顾忆负责研究方案设计；路清华和顾忆负责样品采集、基础资料收集和勘探进展调研；孔丽姝完成实验工作；孙永革负责论文撰写及图件清绘。所有作者参与结果讨论与论文的修改，并同意最终稿件提交。

HTML全文

图 1 塔里木盆地古城墟隆起顺南1井所处构造地理位置

据沙旭光等^[3]修改。

Figure 1. Structural location of well Shunnan 1 in Guchengxu Uplift, Tarim Basin

下载: 全尺寸图片幻灯片

图 2 塔里木盆地顺南1井(a)和中深1C井(b)原油全烃色谱特征

MCH为甲基环己烷；EB为乙基苯。

Figure 2. Total hydrocarbon chromatography characteristics of the crude oil of well Shunnan 1 (a) and well Zhongshen 1C (b) in Guchengxu Uplift, Tarim Basin

下载: 全尺寸图片幻灯片

图 3 塔里木盆地古城墟隆起顺南1井原油中甾烷(a)和萜类化合物(b)的分布特征

Figure 3. Distribution characteristics of the sterane (a) and terpenoids (b) in the crude oil of well Shunnan 1 in Guchengxu Uplift, Tarim Basin

下载: 全尺寸图片幻灯片

图 4 塔里木盆地古城墟隆起顺南1井原油中稠环芳烃的分布特征

Figure 4. Distribution characteristics of the polynuclear aromatics in the crude oil of well Shunnan 1 in Guchengxu Uplift, Tarim Basin

下载: 全尺寸图片幻灯片

图 5 塔里木盆地古城墟隆起顺南4井5 597.1 m井段灰岩中沿微裂缝分布的黑褐色干沥青

左图视域放大100倍，右图视域放大50倍。

Figure 5. Dark brown dry bitumen distributed along the microfractures in the limestone in 5 597.1 m section of well Shunnan 4 in Guchengxu Uplift, Tarim Basin

下载: 全尺寸图片幻灯片

图 6 塔里木盆地古城墟隆起顺南1井原油正构烷烃(a)和烷基萘—联苯系列化合物(b)分子碳同位素组成特征

Figure 6. Molecule carbon isotope composition characteristics of the n-alkanes (a) and alkyl naphthalene-biphenyl series compound (b) in the crude oil of well Shunnan 1 in Guchengxu Uplift, Tarim Basin

下载: 全尺寸图片幻灯片

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