Characteristics and significance of onsite gas desorptionfrom Wufeng-Longmaxi shales in southeastern Sichuan Basin

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  • 1.Wuxi Research Institute of Petroleum Geology,RIPEP,SINOPEC,Wuxi 214126,China;
    2.SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms,Wuxi 214126,China;
    3.Shale Oil and Gas Accumulation Mechanism and Effective Development of State Key Laboratory,Wuxi 214126,China;
    4.The State Energy Research and Development Center of Shale Oil,Wuxi 214126,China;
    5.Exploration Company,SINOPEC,Chengdu 610041,China;
    6.Chongqing Fuling Shale Gas Exploration and Development Company,SINOPEC,Chongqing 408014,China

Received date: 2016-06-29

  Revised date: 2016-09-27

  Online published: 2017-01-10

Abstract

The Uppermost Ordovician-Lower Silurian Wufeng-Longmaxi Formations in southeastern Sichuan Basin is the most important shale gas habitat in China,with a series of discoveries in Jiaoshiba,Pengshui,Dingshan and Nanchuan areas.In this paper,we present data obtained using a self-designed apparatus of onsite shale gas desorption for measuring the gas content,chemical and stable carbon isotope composition at 30 min interval,and discuss the implications of these data for shale gas accumulation and exploration.Carbon isotope value of the initial desorption gas of each shale sample proves valuable for sweet spot identification.The total content and composition of desorption gas provides vital information for estimating the total gas resource in place.Combination of shale gas composition and carbon isotope value could be used to distinguish gas genetic type and relationship to source kerogen.A semi-quantitative model is presented to use the onsite gas desorption data in the assessment of shale gas preservation conditions related to regional structural evolution,as well as the prediction of general trend as a function of production time.

Cite this article

Yang Zhen-heng,Wei Zhi-hong,He Wen-bin,Fan Ming,Yu Ling-jie,Xu Er-she,Qian Men-hui . Characteristics and significance of onsite gas desorptionfrom Wufeng-Longmaxi shales in southeastern Sichuan Basin[J]. Natural Gas Geoscience, 2017 , 28(1) : 156 -163 . DOI: 10.11764/j.issn.1672-1926.2016.11.030

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