突尼斯南部Chotts盆地上志留统Fegaguira页岩油区新认识

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Petroleum Geoscience Pub Date : 2023-07-24 DOI:10.1144/petgeo2023-015
A. B. Mohamed, M. Soussi, M. Saidi, D. Jarvie
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引用次数: 0

摘要

在突尼斯Chotts盆地,上志留统(Ludfordian) Fegaguira组由主要缺氧事件沉积的富有机质黑色泥岩组成。这是一个多产的烃源岩,从常规储层中产生了大量的石油和天然气,大约6900万桶/年,还有大约4500万桶/年的可采储量有待开采。在各项调查的基础上,对Fegaguira组地层进行了更新,并对其非常规储层潜力进行了评价。在目前的工作中,它被分为三个单元(HSII.1, HSII.2和HSII.3),其特征是伽马射线值高达400 API,有机质含量高达17wt。(% TOC),具有成熟的II型海相干酪根的石油潜力(高达60mg HC/g岩石)。第一和第二单元以富有机质泥岩为主,可与Barnett、Antelope和Tuscaloosa相比较。脆性指数评价表明,HSII.1和hsii . 2单元具有较强韧性,可与致密油气藏相比较,而HSII.3第三单元与天然裂缝(孔隙度在3% ~ 7%)的贫有机质灰岩层并置,可与Niobrara B组相比较。在Chotts盆地的页岩油航道内,估计可采石油储量约为13亿桶。这与美国Bakken中部的可采石油估计储量相当。该研究表明,Fegaguira烃源岩应被视为突尼斯的另一个非常规油页岩目标。
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New insights on the upper Silurian Fegaguira shale oil play in the Chotts Basin (Southern Tunisia)
In Tunisia Chotts Basin, the upper Silurian (Ludfordian) Fegaguira Formation comprises, organic-rich black mudstones deposited during a major anoxic event. It is a prolific source rock having yielded a large volume of oil and gas from conventional reservoirs that reached about 69 MMB OE with around 45MM BOE as recoverable reserves still to be produced. Based on various investigations, the stratigraphy of the Fegaguira Formation is updated and its unconventional play potential is assessed. It is divided, in the present work, into three units (HSII.1, HSII.2, and HSII.3) characterized by gamma-ray values up to 400 API, organic matter content (up to 17wt. % TOC), and petroleum potential (up to 60mg HC/g rock) with mature Type II marine kerogen. The first and the second units which are dominantly organic-rich mudstones can be compared to the Barnett, Antelope, and Tuscaloosa. Evaluation of the brittleness index shows that the HSII.1 and 2 units are mostly ductile and comparable to tight oil and gas reservoirs, while the HSII.3 third unit, where organic-rich facies are juxtaposed to organic-lean limestone beds with natural fractures (porosity between 3 and 7% ), may be compared to the Niobrara B formation. Within the shale-oil fairway of the Chotts basin, the estimated recoverable oil is around 1.3 billion bbl. It is comparable to the recoverable oil estimated volume for the Middle Member of the Bakken in the USA. This study demonstrates that the Fegaguira source rock should be considered as an additional unconventional oil-shale target for Tunisia.
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来源期刊
Petroleum Geoscience
Petroleum Geoscience 地学-地球科学综合
CiteScore
4.80
自引率
11.80%
发文量
28
审稿时长
>12 weeks
期刊介绍: Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.
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