Geochemical features of hydrocarbon gas generated from different coaly source rocks by pyrolysis experiments:Case study of the Sulige Gas Field in the Ordos Basin,China

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  • PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China

Received date: 2018-07-09

  Revised date: 2018-10-30

  Online published: 2019-02-01

Abstract

In order to study the gas generation process of different coaly source rocks,we did thermal simulation experiments on coal,coaly mudstone and carbon mudstone.And a series of geochemical analysis including chemical composition,carbon and hydrogen isotope composition as well as light hydrocarbon analysis on thermal simulation gas are also carried out in this study.It revealed coal has the highest gas production rate,in addition,it yields a large amount of CO2 gas in the early stage of simulation experiment.Carbon and hydrogen isotope of coalthermal simulation gas is slightly heavier than that of coaly mudstone and carbonaceous mudstone gas.Before 500℃,carbon and hydrogen isotope of these three kinds of gases became lighter and then higher with the increase of temperature,but after 500℃,they became lighter all the time.Carbon isotope series reversal is observed in this process.The coal thermal simulation gas has the highest content of benzene,toluene and 2,3-methyl pentane.This study indicated 2 high lights on Sulige Gas Field:(1) CO2,formed in the early stage of hydrocarbon generation,may have a direct relationship with reservoir densification in the Sulige Gas Field.(2) According to the analysis of light hydrocarbon,coal should be the dominant contributor for the accumulation of the Sulige natural gas,but the contribution of coaly mudstone and carbonaceous mudstone cannot be ignored.

Cite this article

Yu Cong, Hu Guo-yi, Chen Rui-yin . Geochemical features of hydrocarbon gas generated from different coaly source rocks by pyrolysis experiments:Case study of the Sulige Gas Field in the Ordos Basin,China[J]. Natural Gas Geoscience, 2019 , 30(1) : 133 -142 . DOI: 10.11764/j.issn.1672-1926.2018.10.025

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