Petroleum potential from Permian-Triassic strata of the Maniamba Basin, Mozambique: A preliminary characterisation

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-03-20 DOI:10.25131/sajg.127.0013

N. Nhamutole, M.K. Bamford, P.A. Souza, T.F. Silva, D.A Carmo

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Abstract

In order to further our understanding regarding the petroleum potential of the Maniamba Basin, Mozambique, organic rich sediments from four outcrops were investigated. Organic-rich shales, claystones, sandstones and siltstones were sampled for geochemical organic analyses that included Total Organic Carbon (TOC), and Rock Eval Pyrolysis. The pyrolysis analysis showed that the TOC ranges from good to excellent, thus indicating a potential for hydrocarbon generation. Based on the hydrogen index (HI) versus oxygen index (OI) diagram, most samples were classified as kerogen type III or IV, however, a mixed type II and III was also observed. These data suggest that the Organic Matter (OM) is of terrigenous origin with the occurrence of organofacies C, CD and D. The majority of the studied samples are found to be at mature to overmature stages. The overmaturation of the OM may be associated with tectonic events during the process of basin subsidence, and close proximity to igneous intrusions. Further, an indigenous nature of the hydrocarbon has been identified. Similar organic matter properties of the studied sections are correlatable with those from Moatize Minjova, Sanangoé-Mefidezi (Mozambique), Ruhuhu (Tanzania) and the Main Karoo Basin in South Africa. Overall, the results of this study suggest a good potential for gas.

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莫桑比克马尼亚姆巴盆地二叠纪-三叠纪地层的石油潜力：初步特征

为了进一步了解莫桑比克马尼扬巴盆地的石油潜力，我们对四个露头富含有机质的沉积物进行了调查。对富含有机质的页岩、粘土岩、砂岩和粉砂岩进行了取样，以进行地球化学有机分析，包括总有机碳（TOC）和岩石评价热解。热解分析表明，总有机碳含量从良好到极佳不等，因此表明具有生成碳氢化合物的潜力。根据氢指数（HI）与氧指数（OI）的对比图，大多数样本被归类为第三或第四类型的角质，但也观察到第二和第三类型的混合样本。这些数据表明，有机质（OM）来源于陆相，出现了有机成因 C、CD 和 D。有机质的过度熟化可能与盆地下沉过程中的构造事件以及靠近火成岩侵入体有关。此外，还确定了碳氢化合物的本地性质。所研究地段的有机质性质与莫桑比克 Moatize Minjova、Sanangoé-Mefidezi、坦桑尼亚 Ruhuhu 和南非主卡鲁盆地的有机质性质相似。总体而言，这项研究的结果表明天然气具有良好的潜力。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.