Abstract

AbstractThe FE Block is located in the northwestern margin of the Madre de Dios Basin at the front of the sub-Andean fold and thrust belt. Geochemical analyses were performed in gas samples from FE Block. To identify the genetic type of gases, the level of thermal evolution, and distribution law of natural gas. Gas samples were analyzed by gas chromatography in order to determine the percentages of hydrocarbons, GC-C-IRMS for the determination of the carbon isotopic ratios (δ13C) of C1-C4 and carbon dioxide. In addition, GC-TC-IRMS was carried out to obtain the hydrogen isotopic composition of C1-C4 gas components. All gas samples presented thermogenic gases with normal pattern of molar (C1 > C2 > C3 > C4) and isotopic (δ13C1 < δ13C2 < δ13C3 < δ13C4) composition. The presence of two different groupings of molar and isotopic composition of gases. One representing almost dry gases (≈95% C1) and another group representing oil associated gases. The thermal maturity of the two groups of natural gas samples is close to each other, and the natural gas samples are identified as coal type gas with high maturity and high maturity. Gas reservoirs have zonal distribution characteristics in plane, and the difference in space may be caused by the difference in hydrocarbon supply of source rocks with the same origin and different thermal maturity.KeywordsNatural gasGeochemistryMadre de Dios BasinPeru

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