加拿大西部蒙特尼地层非常规混合石油系统内部和外部源岩的石油迁移

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Arka Rudra , James M. Wood , Victoria Biersteker , Hamed Sanei
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引用次数: 0

摘要

非常规混合石油系统部分或全部为自源。它们的碳氢化合物产生于内部(构造内)富含有机质的泥岩源岩,随后迁移到相邻的由砂岩、粉砂岩或碳酸盐岩组成的有机质贫乏储层中。储层质量在体积上占优势的混合系统还可通过外部源岩的长距离迁移获得碳氢化合物。然而,以往对混合系统的研究很少关注内部和外部来源碳氢化合物的迁移和混合。为了弥补这一不足,本研究对加拿大西部蒙特尼地层一个主要非常规混合石油系统中两口井的钻孔岩心和产出的碳氢化合物液体样本进行了有机地球化学和稳定碳同位素综合研究。研究结果表明,随着蒙特尼地层上部深度的增加,地球化学呈现出明显的变化趋势,包括 C30+ 生物标志化合物减少、饱和度与芳香烃 δ13C 值相比损耗增加、饱和度和流动油的比例增加。这些趋势表明,石油从上覆多伊格地层的外源岩迁移到了蒙特尼地层的上部。外部来源的多伊格石油向下迁移,形成了一个宽阔的过渡带,在这个过渡带中,多伊格来源的石油与本地迁移的轻质油混合,轻质油产生于热成熟度稍高的蒙特尼内部源岩中。这项研究为蒙特尼地层中不同油荷的迁移和混合提供了新的思路,并可能广泛适用于其他类似的非常规混合石油系统,这些系统中的碳氢化合物既来自内部源岩,也来自外部源岩。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Oil migration from internal and external source rocks in an unconventional hybrid petroleum system, Montney Formation, western Canada

Unconventional hybrid petroleum systems are partially to entirely self-sourced. Their hydrocarbons are generated within internal (intraformational) organic-rich mudstone source rocks and subsequently migrate into adjacent organic-lean reservoir beds composed of sandstone, siltstone or carbonate. Hybrid systems with volumetrically dominant reservoir-quality rocks can additionally receive hydrocarbon charge by longer-range migration from external source rocks. However, few previous studies of hybrid systems have focused on the migration and mixing of hydrocarbons from both internal and external sources. To address this shortfall, this study presents an integrated organic geochemistry and stable carbon isotope investigation of drill-core and produced hydrocarbon liquid samples from two wells in a major unconventional hybrid petroleum system in the Montney Formation of western Canada. The results reveal distinct geochemical trends with increasing depth through the upper part of the Montney Formation including decreased C30+ biomarker compounds, increased depletion of saturate compared to aromatic δ13C values, and increased proportions of saturates and mobile oil. These trends indicate that oil from external source rocks of the overlying Doig Formation migrated into the upper part of the Montney Formation. Downward migration of externally sourced Doig oil resulted in a broad transition zone where Doig-sourced oil mixed with locally migrated lighter oil generated within internal Montney source rocks of slightly higher thermal maturity. This study sheds new light on the migration and mixing of disparate oil charges in the Montney Formation, and likely has widespread applicability to other similar unconventional hybrid petroleum systems that had hydrocarbon contributions from both internal and external source rocks.

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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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