Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (2): 325-335.doi: 10.13278/j.cnki.jjuese.20190246

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Natural Gas Characteristics and Source Analysis of Permian Volcanic Gas Reservoir: A Case Study of Well YT1 in Chengdu-Jianyang Area, Sichuan Basin

Tian Xingwang, Luo Bing, Sun Yiting, Liu Ran, Li Ya, Chen Yangui, Zhou Chunlin, Wang Hua, Li Yading, Wang Wei, Wang Yunlong, Yang Dailin   

  1. Exploration and Development Research Institute, Petro China Southwest Oil&Gas Field Company, Chengdu 610041, Sichuan, China
  • Received:2019-11-21 Online:2021-03-26 Published:2021-04-06
  • Supported by:
    Supported by the National Key R&D Plan Project (2017YFC0603106) and the National Science and Technology Major Special Topic (2017ZX05008-005-003)

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Abstract: At the end of December 2018, a high-yield gas-flow of 22.5×104m3/d was discovered by the risk exploration well of Permian volcanic rock-Well YT1 deployed by PetroChina southwest oil & gas field company, which made a breakthrough in the exploration of volcanic rocks in Sichuan basin and broadened a great exploration potential of pyroclastic gas reservoir. According to the latest drilling results,the latest analysis,and test data, the gas-gas correlation method in different areas was adopted. The analysis of the geochemical characteristics of natural gas, the anatomy of the source reservoir contact relationship and the comprehensive comparison of gas sources in this area were carried out,and the origin of natural gas in the Permian volcanic gas reservoir and the gas source were determined. The results show that the natural gas of Well YT1 in the volcanic gas reservoir is typically dry gas, with a drying coefficient of 0.997, the content of CH4 is high with an average of 99.03%, the content of C2H6 is low with an average of 0.35%, C3H8 is almost absent and the content of H2S is zero; the carbon isotope values of methane and ethane are relatively light with the average carbon isotopic values of-32.17‰ and -34.27‰ respectively,and a large amount of reservoir bitumen can be seen in the core and under the microscope. The genetic identification analysis shows that the natural gas of Well YT1 in the volcanic gas reservoir is the secondary cracked gas of crude oil. Based on the source reservoir contact relationship and the comparison of methane and ethane carbon isotopes of natural gas, the natural gas of Well YT1 in the volcanic gas reservoir is mainly from the thick, high-quality,and effective source rocks of the Lower Cambrian Qiongzhusi Formation, which developed in the internal rift valley of the Deyang-Anyue platform and partially from the Middle Permian.

Key words: Sichuan basin, Permian, Well YT1, pyroclastic rocks, natural gas, geochemistry, gas source

CLC Number: 

  • P618.13
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