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2022 Vol. 49, No. 4
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SHAO Wei, HUANG Zhengqing, LI Jianqing, ZHOU Daorong. 2022. Shale gas reservoir-forming conditions and exploration prospecting in the Cambrian Hetang Formation of southwestern Zhejiang and northeastern Jiangxi Province[J]. Geology in China, 49(4): 1262-1274. doi: 10.12029/gc20220416
Citation: SHAO Wei, HUANG Zhengqing, LI Jianqing, ZHOU Daorong. 2022. Shale gas reservoir-forming conditions and exploration prospecting in the Cambrian Hetang Formation of southwestern Zhejiang and northeastern Jiangxi Province[J]. Geology in China, 49(4): 1262-1274. doi: 10.12029/gc20220416
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Shale gas reservoir-forming conditions and exploration prospecting in the Cambrian Hetang Formation of southwestern Zhejiang and northeastern Jiangxi Province

  • Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China

    • Fund Project: Supported by the project of China Geological Survey (No. 2016ZX05034001-003)
More Information
  • Author Bio: SHAO Wei, male, born in 1988, engineer, engaged in the study of oil and gas geology; E-mail: 18013912742@163.com
  • Corresponding author: HUANG Zhengqing, male, born in 1965, senior engineer, engaged in the study of shale gas geology and geochemistry; E-mail: 463968827@qq.com 
Received Date:  29 November 2019
Revised Date:  15 June 2022
Publish Date:  25 August 2022
    Abstract

  • This paper is the result of oil and gas exploration engineering.

     Objective

    The dark shale of the Cambrian Hetang Formation widely occurred in southwestern Zhejiang and northeastern Jiangxi is the key target of shale gas exploration in the Lower Yangtze region. However, due to the present low exploration level of this interval, understanding of the shale gas accumulation conditions is still insufficient.

     Methods

    Based on the analysis of geological background, organic geochemical indicators and field stratigraphic outcrop investigation of the dark shale, the shale gas resource potential is evaluated and the favorable areas are optimized.

     Results

    The dark shale ranges from 35 to 200 meters in thickness with an average of over 50 meters in Jiangshan-Changshan area and is characterized by medium to high content of organic matter (TOC ranging from 1.48% to 23.53%) and high to over maturity (Ro ranging from 2.01% to 3.0%). The organic matters are highly and over highly matured. Abundant micropores and microfractures were observed in the shales, indicating the high quality shale reservoirs. The isothermal adsorption experiment shows that the carbonaceous shale has strong adsorption ability, which reaches 5.93 kg/t on average.

     Conclusions

    It is suggested that the region of Jiangshan-Changshan area in western Zhejiang is favorable for shale gas exploration on the basis of relatively low thermal evolution of organic matter and stable stratigraphic structure preservation conditions.
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