JURASSIC PETROLEUM SYSTEMS IN THE LUSITANIAN BASIN, PORTUGAL: NEW INSIGHTS BASED ON OIL – SOURCE ROCK CORRELATIONS

IF 1.8 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Journal of Petroleum Geology Pub Date : 2023-09-28 DOI:10.1111/jpg.12847

Marco Brito, René Rodrigues, Rui Baptista, Luís V. Duarte, Ana C. Azerêdo, Cleveland M. Jones

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Abstract

New stable carbon isotope and biomarker data for oils and source rock extracts from the Lusitanian Basin, Portugal, were studied in order to investigate the petroleum systems which are present there. The new analytical data was combined with data presented in previous publications, and oil-oil and oil- source rock correlations were carried out. Three genetic groups of oils (Groups 1, 2 and 3), belonging to three different petroleum systems, were identified:

Group 1 oils occur in the northern sector of the Lusitanian Basin and were generated by the Coimbra Formation (Sinemurian) source rock. Reservoir rocks for oils in this group are the Coimbra, Água de Madeiros (upper Sinemurian – lower Pliensbachian), Boa Viagem (Kimmeridgian –Tithonian) and Figueira da Foz (upper Aptian – Cenomanian) Formations. Other potential source rocks in the northern sector of the basin, such as the Polvoeira Member of the Água de Madeiros Formation and the Marly Limestones with Organic Facies (MLOF) Member of the Vale das Fontes Formation (Pliensbachian), had biomarker characteristics which differed from those of the Group 1 oils and did not therefore generate them.

Group 2 oils occur in the central and southern sectors of the basin. The source rock is the Cabaços Formation (middle Oxfordian), and reservoir rocks are the Montejunto (middle-upper Oxfordian) and Abadia (Kimmeridgian) Formations.

Group 3 is represented by an oil sample from the central sector of the Lusitanian Basin. Both the source rock and the reservoir rock for the oil are the Montejunto Formation.

Geochemical data combined with the regional tectono-stratigraphic history suggest that the generation-migration-accumulation of most of the oil (critical moment) in the Coimbra – Coimbra - Água de Madeiros - Boa Viagem - Figueira da Foz (!) petroleum system occurred in the early Campanian. For the Cabaços – Montejunto - Abadia (!) and Montejunto – Montejunto (!) petroleum systems, the critical moment occurred in the late Cenomanian.

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葡萄牙卢西塔尼亚盆地侏罗系油气系统：基于油源岩对比的新认识

研究了葡萄牙卢西塔尼亚盆地石油和烃源岩提取物的新的稳定碳同位素和生物标志物数据，以研究那里存在的石油系统。将新的分析数据与以往出版物中的数据相结合，进行了油气和油源岩对比。确定了属于三个不同石油系统的三个油成因组（第1、2和3组）：第1组油产于卢西塔阶盆地北部，由Coimbra组（Sinemurian）烃源岩生成。该组油的储层岩石为Coimbra、Água de Madeiros（上Sinemurian-下Pliensbachian）、Boa Viagem（Kimmeridian-Tithonian）和Figueira da Foz（上Aptian-Cenomanian）地层。盆地北部的其他潜在烃源岩，如Água de Madeiros组的Polvoeira段和Vale das Fontes组（Pliensbachian）的Marly Limestones with Organic Facies（MLOF）段，具有与第1组油不同的生物标志物特征，因此没有产生这些特征。第2组油产于盆地的中部和南部。烃源岩为Cabaços组（中牛津阶），储集岩为Montejunto组（中上牛津阶）和Abadia组（Kimmeridian阶）。第3组由Lusitanian盆地中部的石油样品代表。油的烃源岩和储集岩均为Montejunto组。地球化学数据结合区域构造-地层史表明，Coimbra-Coimbra-Água de Madeiros-Boa Viagem-Figueira da Foz（！）油气系统中大部分油（关键时刻）的生成-运移-聚集发生在坎帕尼亚早期。对于Cabaços-Montejunto-Abadia（！）和Montejunto–Montejunto（！）石油系统来说，关键时刻发生在晚塞诺曼时期。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Petroleum Geology 地学-地球科学综合

CiteScore

3.40

自引率

11.10%

发文量

审稿时长

6 months

期刊介绍： Journal of Petroleum Geology is a quarterly journal devoted to the geology of oil and natural gas. Editorial preference is given to original papers on oilfield regions of the world outside North America and on topics of general application in petroleum exploration and development operations, including geochemical and geophysical studies, basin modelling and reservoir evaluation.