塔里木盆地下寒武统岳尔都组不同岩相烃源岩地球化学特征及其对超深油气勘探的意义

IF 3.9 2区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Qianghao Zeng, Taohua He, Ya Zhao, Ke Zhang, Zhigang Wen, Yaohui Xu, Jiayi He, Weichao Tian, Shuangfang Lu, Wangming Cheng, Zhou Xie, Kaiwen Xue, Changjun Ji
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引用次数: 0

摘要

塔里木盆地蕴藏着丰富的深层至超深层油气资源,但具体的油源对比有待进一步研究。尤尔图斯组(Є1y)作为潜在的关键烃源岩,其有机地球化学特征值得进一步研究。结合塔里木盆地东部、北部和西北部现有井和露头Є1y烃源岩的生物标志物、碳、硫同位素数据,更好地约束Є1y烃源岩的分布、生烃潜力、生物标志物特征和油源关系。结果表明,Є1y发育多种岩相,包括钙质泥岩、硅质页岩、页岩等潜在烃源岩。钙质泥岩总有机碳(TOC)含量最高,达29.8%,为II型干酪根,热成熟度成熟至过成熟。三芳甾体(TAS)、三芳甲藻甾体(TDSI)和芳基类异戊二烯(1-烷基-2,3,6-三甲基苯,ATMBs)等稳定生物标志物在三种岩性类型烃源岩中具有显著差异:钙质泥岩的生物标志物分布模式与经典奥陶系烃源岩(C26R + C27S TAS 28S TAS, TDSI 1y)相似;硅质岩石表现出典型的寒武系特征,低C28 TAS,高TDSI,但缺乏atmb。页岩具有低C28 TAS、高TDSI、低atmb的典型寒武系特征。基于正构烷烃碳硫同位素的油源对比表明,钙质页岩可能是当前勘探的主要油源之一。这些发现丰富了对塔里木盆地深层和超深层油气勘探的基本认识,为重新评价油源关系提供了新的思路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Geochemical characteristic of different-lithofacies source rocks and its implications for ultradeep hydrocarbon exploration in the lower cambrian Yuertus formation, Tarim basin.

Geochemical characteristic of different-lithofacies source rocks and its implications for ultradeep hydrocarbon exploration in the lower cambrian Yuertus formation, Tarim basin.

Geochemical characteristic of different-lithofacies source rocks and its implications for ultradeep hydrocarbon exploration in the lower cambrian Yuertus formation, Tarim basin.

Geochemical characteristic of different-lithofacies source rocks and its implications for ultradeep hydrocarbon exploration in the lower cambrian Yuertus formation, Tarim basin.

The Tarim Basin harbors abundant deep to ultra-deep hydrocarbon resources, yet detailed oil-source correlation remains to be further investigated. As a potential key source rock, the organic geochemical characteristics of the Yuertus Formation (Є1y) warrant additional research. This study integrates biomarker, carbon, and sulfur isotope data from Є1y source rocks in existing wells and outcrops across the eastern, northern, and northwestern Tarim Basin to better constrain the distribution, hydrocarbon generation potential, biomarker features, and oil-source relations of Є1y. Results reveal that Є1y exhibits diverse lithofacies, including calcareous mudstones, siliceous shales, and shales as potential source rocks. The calcareous mudstone shows the highest total organic carbon (TOC) content (up to 29.8%), characterized by Type II kerogens and mature to over-mature thermal maturity. Stable biomarkers including triaromatic steroids (TAS), triaromatic dinoflagellate steroids (TDSI), and aryl isoprenoids (1-alkyl-2,3,6-trimethylbenzenes, ATMBs) reveal significant differences among the three lithological types of source rocks: Calcareous mudstones exhibit biomarker distribution patterns similar to those of classical Ordovician source rocks (C26R + C27S TAS < C28S TAS, TDSI < 0.6), while simultaneously containing high abundances of ATMBs characteristic of the Є1y. Siliceous rocks display typical Cambrian characteristics with low C28 TAS, high TDSI, but absence of ATMBs. Shales present typical Cambrian features with low C28 TAS, high TDSI, and low ATMBs. Oil-source correlation based on n-alkane' carbon and sulfur isotopes suggests that calcareous shales are likely one of the primary sources for currently explored oils. These findings enrich the fundamental understanding of deep and ultra-deep hydrocarbon exploration in the Tarim Basin and provide new insights into the reassessment of oil-source relations.

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来源期刊
Scientific Reports
Scientific Reports Natural Science Disciplines-
CiteScore
7.50
自引率
4.30%
发文量
19567
审稿时长
3.9 months
期刊介绍: We publish original research from all areas of the natural sciences, psychology, medicine and engineering. You can learn more about what we publish by browsing our specific scientific subject areas below or explore Scientific Reports by browsing all articles and collections. Scientific Reports has a 2-year impact factor: 4.380 (2021), and is the 6th most-cited journal in the world, with more than 540,000 citations in 2020 (Clarivate Analytics, 2021). •Engineering Engineering covers all aspects of engineering, technology, and applied science. It plays a crucial role in the development of technologies to address some of the world''s biggest challenges, helping to save lives and improve the way we live. •Physical sciences Physical sciences are those academic disciplines that aim to uncover the underlying laws of nature — often written in the language of mathematics. It is a collective term for areas of study including astronomy, chemistry, materials science and physics. •Earth and environmental sciences Earth and environmental sciences cover all aspects of Earth and planetary science and broadly encompass solid Earth processes, surface and atmospheric dynamics, Earth system history, climate and climate change, marine and freshwater systems, and ecology. It also considers the interactions between humans and these systems. •Biological sciences Biological sciences encompass all the divisions of natural sciences examining various aspects of vital processes. The concept includes anatomy, physiology, cell biology, biochemistry and biophysics, and covers all organisms from microorganisms, animals to plants. •Health sciences The health sciences study health, disease and healthcare. This field of study aims to develop knowledge, interventions and technology for use in healthcare to improve the treatment of patients.
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