巴基斯坦喜马拉雅山西北部卡拉奇塔山脉侏罗纪-古近纪地层的岩石生物地层学和烃源岩潜力

IF 1.9 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Petroleum Geoscience Pub Date : 2024-01-16 DOI:10.1144/petgeo2022-075

S. Ahmad, Faizan Ahmad, Sohail Raza, Suleman Khan, B. Wadood, M. Mohibullah

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引用次数: 0

摘要

本研究对侏罗纪-古近纪地层进行了调查，以了解不同地层组的岩石-生物地层框架和油气源岩潜力。生物地层控制用于建立该地区侏罗纪-古近纪地层的年代地层框架。下侏罗统（海唐统）碎屑岩在新元古代-liensbachian时期出现了uconformity，而下侏罗统（托拉千统）-中侏罗统（巴约千统）碎屑岩-碳酸盐混合地层也被中侏罗统（卡洛维统）-上侏罗统（提托尼统）碳酸盐序列的Bathonian Unconformity分隔开来。上侏罗世牛津统地层缺失，而上侏罗世（金梅里吉统）-下白垩统（维朗基尼统）釉质砂岩-粘土则是顺应层序。下白垩统（豪特里维安统）-上白垩统（都朗基安统）碎屑岩是一个顺层序列，与上白垩统（坎帕尼昂统）侏罗纪碳酸盐岩之间存在一个科尼亚-山统不整合层位。白垩纪-白垩纪界线以红土为标志，而古新世（塔尼蒂）序列则以页岩和砂岩为主。古新世（塔尼蒂）-早始新世（伊勒底）硅碎屑岩-碳酸盐混合序列标志着泰西沉积的最后一段时期。总有机含量（TOC）、有机岩相学和岩石评价热解（REP）技术被用来评估碳氢化合物源岩的潜力、角质类型和碳氢化合物的成熟度。所研究的大多数样本显示存在 IV 型角质。不过，萨马纳苏克地层的中侏罗世（卡洛维期）-上侏罗世（提多尼期）碳酸盐岩序列、金美里季-白垩纪的奇查里地层、汉古地层的古新世（他尼西纪）序列以及古新世（他尼西纪）碳酸盐岩序列都显示出烃源岩的潜力、以及古新世（他尼地层）-早始新世（伊勒地层）帕塔拉地层证实了该地区存在第三类角质、岩源质量差-一般、未成熟-成熟、易产气-油的本土碳氢化合物。

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Litho-biostratigraphy and hydrocarbon source rock potential of the Jurassic-Paleogene strata in the Kala Chitta Range, northwestern Himalayas, Pakistan

In this study Jurassic-Paleogene strata were investigated to understand the litho-biostratigraphic framework and hydrocarbon source rock potential of various stratal packages. Biostratigraphic controls were used to establish the chronostratigraphic framework of Jurassic-Paleogene strata in the area. The Lower Jurassic (Hettangian) clastics saw an uconformity during Sinmurian-Pliensbachian, while the Lower Jurassic (Toracian) – Middle Jurassic (Bajocian) clastic-carbonate mixed strata is also separated by a Bathonian Unconformity from the Middle Jurassic (Callovian)-Upper Jurassic (Tithonian) carbonate sequence. The Upper Jurassic Oxfordian strata are missing while the Upper Jurassic (Kimmeridgian)- Lower Cretaceous (Velanginian) glaucoconatic sandstone-clays are the conformable sequences. The Lower- Cretaceous (Hauterivian)-Upper Cretaceous (Turonian) clastics is a conformable sequence which is separated by a Coniacian-Santonian unconformity from the Upper Cretaceous (Campanion) pelegic carbonates. The Cretaceous-Tertairy Boundary is marked by laterites while the Paleocene (Thanetian) sequence is represented by a shale and sandstone dominated sequence. The Paleocene (Thanetian)-Early Eocene (Ilerdian) siliciclastic-carbonates mixed sequence marks the last episode of Tethyan sedimentattion. Total Organic Content (TOC), organic petrography and Rock Eval Pyrolysis (REP) techniques were used to evaluate the hydrocarbon source rock potential, kerogen type, level of maturity of the hydrocarbons. The majority of studied samples show the occurrence of type IV kerogen. However, the Middle Jurassic (Callovian)-Upper Jurassic (Tithonian) carbonate sequence of the Samana Suk Formation, the Kimmeridgian-Velanginian Chichali Formation, the Paleocene (Thanetian) sequence of the Hangu Formation, and Paleocene (Thanetian)-Early Eocene (Ilerdian) Patala Formation confirms the Type III kerogen, poor-fair source rock quality, immature-mature, gas-oil prone indigenous hydrocarbon occurrence in the region.

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来源期刊

Petroleum Geoscience 地学-地球科学综合

CiteScore

4.80

自引率

11.80%

发文量

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.