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 char-acterized by very different biomarker signals as compared to the tar sands and oil samples.Both samples are domi-nated by hopanes as compared to tri-and tetracyclic ter-panes,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 dis-tribution 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 For-mation 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.

Departamento de Ciencias Geológicas,Facultad de Ciencias Exactas y Naturales,Universidad de Buenos Aires,Ciudad Universitaria,CONICET-IGEBA,Pabellón Ⅱ,1428 Buenos Aires,Argentina;Lundin Energy Norway,Lysaker,Norway

[1]Eduardo A.Rossello;Rolando Di Primio-.Hydrocarbon distribution along the Soapaga thrust(Eastern Cordillera,Colombia)based on new strategic geochemistry samples)[J].地球化学学报（英文版）,2022(03):335-350

Soapaga,Cordillera,panes,Tibasosa,Chipaque,terpanes,Arcabuco,Picacho

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