Geochemistry and accumulation process of deep natural gas in the platform-basin region,Tarim Basin

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  • 1.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China;
    2.Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla 841000,China

Received date: 2018-04-17

  Revised date: 2018-05-31

  Online published: 2018-08-29

Abstract

In recent years,many natural gas reservoirs have been discovered in the platform-basin region of the Tarim Basin.For example,Shunnan-Gucheng area in the Middle-Lower Ordovician (6 000-7 200m),Tazhong area in the Middle-Lower Cambrian (6 400-7 000m) and Markit Slope Well LS2 in Ordovician Penglaiba Formation (5 800m),the natural gas is mainly from the Cambrian source rocks by the results of gas-source correlation.In the platform-basin region,the dryness coefficient of natural gas (C1/C1-4) was mainly greater than 0.95 and it is defined as dry gas;the isotopic value of methane (δ13C1) was mainly distributed from -39.0‰ to -33.5‰,partly less than -40.0‰;while the isotopic values of ethane (δ13C2) are distributed from -39.0‰ to -32.0‰,which was in accordance with the results of kerogen thermal simulation experiments at 550℃ to 600℃(at 20℃/h).With little influence from the charging of Cambrian kerogen pyrolysis gas and low degree of thermal evolution,the interval of Well ZS1 ∈2a and Well ZS5 ∈1wcontain low maturity of oil associated gas.The impact of the charging of post-mature kerogen pyrolysis gas from Cambrian source rock,led to the deep natural gas with the characteristics of high dryness coefficient and heavy carbon isotope values.The characteristics of deep natural gas in different areas of Tarim Basin vary greatly,the main reasons include physical properties of reservoirs,tectonic fault activity,and differential filling of Cambrian over-mature kerogen pyrolysis gas.

Cite this article

Chen Fei-ran, Zhang Yi-jie, Zhu Guang-you, Zhang Bao-shou, Lu Yu-hong, Zhang Zhi-yao . Geochemistry and accumulation process of deep natural gas in the platform-basin region,Tarim Basin[J]. Natural Gas Geoscience, 2018 , 29(6) : 880 -891 . DOI: 10.11764/j.issn.1672-1926.2018.05.022

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