Geochemistry of the self-generated and self-accumulated gasof Lower Paleozoic in Ordos Basin,China

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  • 1.PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China;
    2.Tianjin North China Geological Exploration Bureau of Nuclear Industry 247 Brigade,Tianjin 301800,China

Received date: 2015-12-17

  Revised date: 2016-04-25

  Online published: 2019-09-10

Abstract

There has been dispute on the origin of Lower Paleozoic gas in Ordos Basin for more than 30 years.Two main opinions include the Upper Paleozoic coal-derived origin and the Lower Paleozoic carbonate origin.In recent years,researchers began to study the origin of the Lower Paleozoic gas in Ordos Basin by region or by strata.It is believed that different regions of the basin have different constitution of source rock and reservoir.So the Lower Paleozoic gas in different part of the basin has different percent of gas mixed from the Upper and Lower Paleozoic gas.The deep discussion has made the gas origin more clearly.However,it also raised two questions when it comes to the calculation of the mixing percent from the Upper and Lower Paleozoic gas:(1)Whether the Lower Paleozoic source rock could generate self-preserved gas? If the answer is yes,then;(2)What are the characteristics of the self-generated and self-accumulated gas of Lower Paleozoic source rock? In this paper,we combined the log data into the evaluation of source rock,and the TOC result reveals that effective source rock exists in Lower Paleozoic.Also we compared the geochemistry of Lower Paleozoic gas below salt and gas above salt and found that the gas generated from the Lower Paleozoic source rock all has δ13C1<-35‰ and δ13C2<-28‰.

Cite this article

Liu Dan, Feng Zi-qi, Liu Yang, Peng Wei-long, Han Wen-xue . Geochemistry of the self-generated and self-accumulated gasof Lower Paleozoic in Ordos Basin,China[J]. Natural Gas Geoscience, 2016 , 27(10) : 1892 -1903 . DOI: 10.11764/j.issn.1672-1926.2016.10.1892

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