<span>Source of the Upper Paleozoic natural gas in Dingbei area in the Ordos Basin</span>

Wu Xiao-qi, Ni Chun-hua, Chen Ying-bin, Zhu Jian-hui, Li Kuang, Zeng Hua-sheng

doi:10.11764/j.issn.1672-1926.2019.03.015

Natural Gas Geoscience >

2019 , Vol. 30 >Issue 6: 819 - 827

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.03.015

Source of the Upper Paleozoic natural gas in Dingbei area in the Ordos Basin

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1.Research Center of Exploration and Development in Sichuan Basin,Research Institute of Petroleum Exploration and Production,SINOPEC,Chengdu 610041,China;
2.Wuxi Research Institute of Petroleum Geology,Research Institute of Petroleum Exploration and Production,SINOPEC,Wuxi 214126,China

Received date: 2019-02-14

Revised date: 2019-03-28

Online published: 2019-08-05

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Abstract

The Dingbei area is an important exploratory area in the Ordos Basin for SINOPEC,and natural gas exploration in the Upper Paleozoic strata in the area achieved great breakthrough in recent years.However,the origin and source of natural gas are weakly studied,and there is no consensus on whether the Upper Paleozoic gas in the basin has experienced large-scale lateral migration.Studies on the geochemical characteristics of natural gas indicate that,the Upper Paleozoic natural gas in the Dingbei area is typically dry gas with the dryness coefficient (C₁/C_1-5) of 0.977~0.986,and the δ¹³C₁,δ¹³C₂,and δD₁ values are in the ranges of -30.6‰~-28.6‰,-25.9‰~-24.1‰,and -191‰~-177‰,respectively,with positive carbon and hydrogen isotopic sequence between CH₄and C₂H₆.Carbon and hydrogen isotope compositions of alkane gas suggest that the Upper Paleozoic gas in the Dingbei area is typically coal-derived gas.The calculated R_O values according to the two-stage fractionation mode of coal-derived gas is consistent with the measured R_O values of the Upper Paleozoic source rocks,which indicate that the Upper Paleozoic gas in the Dingbei area was mainly derived from in-situ source rocks in the Taiyuan and Shanxi formations.Compared with the Dingbei area,natural gas from the Daniudi gas field in the northeastern Ordos Basin displays lower δ¹³C₁,C₁/C_1-5 and C₁/C₂₊₃values and higher C₂/C₁ ratio,suggesting the lower maturity of source rocks rather than migration effect.The Upper Paleozoic natural gas in the Ordos Basin has not experienced large-scale lateral migration.

Key words： Ordos Basin; Dingbei area; Geochemical characteristics; Origin of natural gas; Source rocks; Carbon and hydrogen isotopes

Cite this article

Wu Xiao-qi, Ni Chun-hua, Chen Ying-bin, Zhu Jian-hui, Li Kuang, Zeng Hua-sheng . Source of the Upper Paleozoic natural gas in Dingbei area in the Ordos Basin[J]. Natural Gas Geoscience, 2019 , 30(6) : 819 -827 . DOI: 10.11764/j.issn.1672-1926.2019.03.015

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