Evaluation of Carboniferous Songkaersu Formation source rocks and gas-source correlation in the Fukang Sag of eastern  Junggar Basin

Yang Fan, Song Yong, Chen Hong, Gong De-yu, Bian Bao-li, Liu Hai-lei

doi:10.11764/j.issn.1672-1926.2019.03.006

2019 , Vol. 30 >Issue 7: 1018 - 1026

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.03.006

Evaluation of Carboniferous Songkaersu Formation source rocks and gas-source correlation in the Fukang Sag of eastern Junggar Basin

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1.Research Institute of Exploration and Development，PetroChina，Beijing 100083，China；
2.Research Institute of Exploration and Development，Xinjiang Oilfield Company，PetroChina，Karamay 834000，China

Yang Fan(1984-), Male, Senior engineer, Doctor, Mainly engaged in petroleum geology research in Junggar Basin research. E-mail：yangfan84@foxmail.com.

Received date: 2019-01-10

Revised date: 2019-03-14

Online published: 2019-08-07

Supported by

Supported by the China National Science and Technology Major Project “Distribution rule and target evaluation of lithologic stratigraphic oil and gas reservoirs in Junggar Basin” (Grant No. 2017ZX05001-004).

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Abstract

The high yield gas production of Well F26 shows that effective source rocks are developed in the Carboniferous.In order to evaluate the scale of the Carboniferous source rocks in the eastern Fukang Sag of the Junggar Basin，19 wells in the Carboniferous Songkaersu Formation were systematically studied.The research results show that the Carboniferous of eastern Fukang Sag has great potential in gas exploration.(1)The Carboniferous Songkaersu Formation is moderately-rich coal-bearing source rocks.The TOC is 0.54%-41.2%，with Type Ⅲ kerogen as the dominant source.As the source rock is located at the high position of the Beisantai Uplift，the maturity of the source rock is low，with an average of 0.88%.(2)The natural gas in Fudong area is mainly high-maturity coal-derived gas sourced from Carboniferous and low-maturity coal-derived gas sourced from Jurassic，with dry gas as the main source.The equivalent maturity of high-maturity coal-derived gas from the Carboniferous system is generally above 1.2%，indicating that the Carboniferous hydrocarbon generation stoves in the Fukang Sag or in the deep part of the Beisantai Uplift.(3)Shaqi Uplift and Fukang Sag，Jimusaer Sag were situated in the back-bulge slope，where is very suitable for coal source rock development.It is considered that the Fudong and Beisantai areas have great potential for natural gas exploration and are expected to become another natural gas scale exploration area after the Kelameili gas field.

Key words： Fukang Sag; Kelameili; Carboniferous; Source rock; Coal type gas

Cite this article

Yang Fan, Song Yong, Chen Hong, Gong De-yu, Bian Bao-li, Liu Hai-lei . Evaluation of Carboniferous Songkaersu Formation source rocks and gas-source correlation in the Fukang Sag of eastern Junggar Basin[J]. Natural Gas Geoscience, 2019 , 30(7) : 1018 -1026 . DOI: 10.11764/j.issn.1672-1926.2019.03.006

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