Sources of coal-derived gas in marine strata in central Sichuan

Qin Sheng-fei, Bai Bin, Yuan Miao, Zhou Guo-xiao, Yang Jin-dong

doi:10.11764/j.issn.1672-1926.2019.05.012

Natural Gas Geoscience >

2019 , Vol. 30 >Issue 6: 790 - 797

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.05.012

Sources of coal-derived gas in marine strata in central Sichuan

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1.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China;
2.China University of Mining & Technology,Beijing 100083,China

Received date: 2019-03-27

Revised date: 2019-05-03

Online published: 2019-08-05

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Abstract

There are gas reservoirs in the Triassic Leikoupo Formation,Jialingjiang Formation,Feixianguan Formation and Permian Changxing Formation in the marine strata of the central Sichuan Basin.Over the years,the gas sources in these gas reservoirs,especially the gas source of the Leikoupo Formation are still unclear.In this paper,the natural gas geochemistry,combined with geological background,are used to compare the composition and isotopes of natural gas in the Permian and Triassic gas reservoirs in the central Sichuan Basin.It is believed that many samples of the 4^th member of Leikoupo Formation are coal-derived gas,and the natural gas comes from the overburden Xujiahe Formation source rock,and there is also some other natural gas from the Lower Leikoupo Formation source rock.The gas of the 1^st member of Leikoupo and Jialingjiang Formation is homologous to the natural gas of Changxing and Feixianguan formations.In Longgang Gas Field,the natural gas of the Changxing and Feixianguan formations mainly comes from the coal-bearing source rocks of the Longtan Formation.In the Moxi Gas Field,the Longtan Formation may be transformed into the Wujiaping Formation in some areas,which is mainly composed of sapropelic organic matter,and the natural gas produced is oil-type gas.Gases from the corresponding overlying reservoirs of Changxing,Feixianguan and Jialingjiang formations,and also the 1^st member of Leikoupo Formation are coal-derived gas.

Key words： Central Sichuan; Marine formation; Coal-derived gas; Origin

Cite this article

Qin Sheng-fei, Bai Bin, Yuan Miao, Zhou Guo-xiao, Yang Jin-dong . Sources of coal-derived gas in marine strata in central Sichuan[J]. Natural Gas Geoscience, 2019 , 30(6) : 790 -797 . DOI: 10.11764/j.issn.1672-1926.2019.05.012

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