四川盆地元坝-通南巴地区须家河组天然气地球化学特征和成因

doi:10.11743/ogg20150610

Abstract

Abstract: In order to investigate the origin and figure out the source of natural gas in the Upper Triassic Xujiahe Formation in Yuanba-Tongnanba area of Sichuan Basin,the composition and stable carbon and hydrogen isotopes were used to analyze the geochemical characteristics of the natural gas.The study indicates that the natural gas in the Xujiahe Formation in the Yuanba-Tongnanba area is mainly composed of methane.It appears to be dry gas with a dryness coefficient generally higher than 0.97.The δ¹³C₁ and δ¹³C₂ values are in the range of -34.5‰~-29.3‰ and -35.4‰~-21.5‰,respectively.The δ¹³C_CO₂ values are generally higher than -8‰,and the δD_CH₄ values are in the range of -181‰~-144‰ without significant correlation with δ¹³C₁ values.The identification of gas origin and gas-source correlation indicate that the natural gas in the Xujiahe Formation is mainly coal-derived gas and sourced from the coal-measure source rocks in the Xujiahe Formation.The gas in the 1^st and 2^nd Members of the Xujiahe Formation in the Yuanba area and the Xujiahe Formation in the Tongnanba area contain a certain amount of secondary oil-cracking gas,which are mainly the product of the low-degree cracking of oil generated by the Wujiaping Fomation source rocks.Some gas samples from the Xujiahe Formation in the Yuanba-Tongnanba area display partial reversal of alkane carbon isotopic series,and the partial reversal of the gas from the 3^rd and 4^th Members in the Xujiahe Formation in the Yuanba area is resulted from the fact that they were generated by the Xujiahe Formation source rocks in the high-mature stage,while that from the 1^st and 2^nd Members in the Xujiahe Formation in the Yuanba area and from the Xujiahe Formation in the Tongnanba area are attributed to the mixing of a small amount of oil cracking gas and a large amount of high-mature coal-type dry gas.

Key words: geochemical characteristics, natural gas, Xujiahe Formation, Yuanba-Tongnanba area, Sichuan Basin

CLC Number:

TE122.1

Wu Xiaoqi, Liu Guangxiang, Liu Quanyou, Liu Jingdong, Luo Kaiping. Geochemical characteristics and origin of natural gas in the Xujiahe Formation in Yuanba-Tongnanba area of Sichuan Basin[J]. Oil & Gas Geology, 2015, 36(6): 955-962,974.

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Geochemical characteristics and origin of natural gas in the Xujiahe Formation in Yuanba-Tongnanba area of Sichuan Basin

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