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hydrocarbon distribution along the Soapaga thrust(Eastern Cordillera, Colombia) based on new strategic geochemistry samples

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Acta Geochimica 2022年第3期41卷 335-350页

作者： Eduardo A.Rossello Rolando Di Primio Departamento de Ciencias Geologicas Facultad de Ciencias Exactas y NaturalesUniversidad de Buenos AiresCiudad UniversitariaCONICET-IGEBAPabellon II1428 Buenos AiresArgentina Lundin Energy Norway LysakerNorway

The Colombian Eastern Cordillera constitutes a region with potential for finding hydrocarbon reserves that are still under-explored, despite the existence of oil and tar sand production. The intense tectonic deformation affects the petroleum systems and increases exploration challenges due to the different generation, maturation, and entrapment conditions that they produce. Diverse geochemical analysis conducted on strategic samples determines that these are likely generated by the same anoxic marine source rock type. Two source rock samples we investigated are characterized by very different biomarker signals as compared to the tar sands and oil samples. Both samples are dominated by hopanes as compared to tri-and tetracyclic terpanes, with very low(Tibasosa Formation) to no(Chipaque Formation) extended tricyclic terpanes. The Soapaga Thrust, along which the analyzed samples are located, has exercised first-rate regional structural control of the distribution of hydrocarbons in the studied area. The uplift of their Mesozoic hanging wall produces intense erosion with sediment transport towards the eastern footwall forming the present infill of the Arcabuco basin. The kitchen areas were connected with the shallower entrapment sectors where excellent reservoir levels such as the Picacho Formation before the Soapaga Thrust movement. The high degree of biodegradation observed in the Picacho Fm. tar sands support early charge before the Soapaga thrust movement, and severe biodegradation following the thrust movement when hydrocarbon supply from the kitchen was interrupted. This work aims to contribute to a better understanding of the geochemical characteristics of the petroleum systems due to the action of the Soapaga Thrust.

关键词： hydrocarbon geochemistry Soapaga thrust Eastern Cordillera Colombia

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hydrocarbon accumulation in deep water areas of Angola in West Africa

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Petroleum Research 2019年第3期4卷 268-275页

作者： Yanqing Huang Lei Zheng SINOPEC Exploration&Production Research Institute Beijing100083China

Through comprehensive analysis of source rocks and hydrocarbon geochemical data of several offshore blocks in Angola,two sets of source rocks in the Cretaceous Iabe Formation and Lower Oligocene Malembo Formation are developed in the suprasalt structures in deep water area.The source rocks in the Cretaceous Iabe Formation is dominated by Type I kerogen,while the source rocks in the Lower Oligocene Malembo Formation is dominated by Type IIeIII kerogen which mainly generate gas.In the extensional zone,the source rocks in the Malembo Formation are mature and the source rocks in the Iabe Formation are post-matured;this zone undergo multi-stage filling,and the Oligocene paleoreservoirs experience high-temperature pyrolysis to form gas reservoirs;the Upper Miocene reservoirs undergo biodegradation due to poor storage condition.In the transitional zone,oil and gas in the drape anticline area are mainly from the Iabe Formation,and it mix with a small amount of oil and gas from the Malembo Formation in the later stage.In the compression zone,the crude oil is from the Iabe Formation at the mature stage,and contains a small amount of dissolved gas generated by thermal degradation.

关键词： Angola Lower CongoeCongo fan basin Source rocks hydrocarbon geochemistry Accumulation model

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