Geochemical Characteristics and Genetic Types of Natural Gas in the Changxing-Feixianguan Formations from Yuanba Gasfield in the Sichuan Basin

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  • 1.Wuxi Research Institute of Petroleum Geology,Research Institute of Petroleum Exploration and Production,
    SINOPEC,Wuxi 214126,China;2.Research Institute of Petroleum Exploration and Production,SINOPEC,
    Beijing 100083,China;3.School of Geosciences,China University of Petroleum,Qingdao 266580,China

Received date: 2015-05-15

  Revised date: 2015-07-24

  Online published: 2015-11-10

Abstract

Yuanba Gasfield is a large gas field in the marine strata with the largest burial depth in China till now,and the studies on the characteristics of reef flat reservoirs in the marine strata and the main controlling factors of hydrocarbon accumulation have achieved significant progresses.However,there is no consensus on the origin of natural gases reservoired in the Changxing-Feixianguan Formations in Yuanba and adjacent area.The study on geochemical characteristics indicates that,the natural gases reservoired in the Changxing-Feixianguan Formations in the Yuanba Gasfield are mainly composed of alkane gases which are dominated by methane with dryness coefficients generally higher than 0.995,and the CO2 and H2S display an average content of 8.55% and 6.47%,respectively.The δ13C1and δ13C2 values are in the range of -31.2‰--27.9‰ and -29.9‰--25.0‰,respectively,displaying the positive carbon isotopic series.The δ13CCO2 values are generally higher than -8‰,and the δD1 values are in the range of -156‰--107‰.The identification of gas origin and gas-source correlation indicate that,the natural gases reservoired in the Changxing-Feixianguan Formations in the Yuanba Gasfield have been altered by thermalchemical sulfate reduction,and they are mainly composed of oil cracked gases derived from the secondary cracking of oil generated by the sapropelic-prone source rocks in the Permian Longtan Formation.The CO2 in the gas pools are mainly inorganic and were derived from the interaction between acidic fluid and carbonate reservoirs.

Cite this article

WU Xiao-qi,LIU Guang-xiang,LIU Quan-you,LIU Jing-dong,YUAN Xiao-yu . Geochemical Characteristics and Genetic Types of Natural Gas in the Changxing-Feixianguan Formations from Yuanba Gasfield in the Sichuan Basin[J]. Natural Gas Geoscience, 2015 , 26(11) : 2155 -2165 . DOI: 10.11764/j.issn.1672-1926.2015.11.2155

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