Gas composition and carbon isotopic fractionation characteristics of terrestrial Ordos shale gas:Implications for prediction of shale gas production over time

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  • 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;
    3.Yanchang Petroleum (Group) Co.Ltd.,Xi’an 710075,China

Received date: 2015-07-03

  Revised date: 2016-01-15

  Online published: 2019-09-19

Abstract

In order to study the variation on shale gas composition and carbon isotopic fractionation characteristics of terrestrial shale in Ordos Basin,and ultimately establish a prediction model for shale gas production to monitor shale gas production capacity and effectively manage the development of shale gas,some core samples from production wells were obtained for desorption analyses of its gas composition and carbon isotope.The desorption results showed that methane content of the desorbed gas is relatively low,the drying coefficient (C1/C1-5) ranges from 0.6 to 0.8,and the carbon isotope is relatively negative.With the increasing desorption and production time,the drying coefficient and carbon isotope values of such desorpted samples show obvious carbon fractionation during gas adsorption/diffusion processes.The changes are mainly with increasing of heavy hydrocarbons (C2+)and heavier carbon isotope values.The drying coefficient show good correlation (R2> 0.8) with the content of shale gas desorption per unit mass.A gas production prediction model was proposed to predict gas production over the life of production well based on the relationship between the drying coefficients and gas production volume in the Ordos Basin.

Cite this article

Chen Fei-ran, Jiang Cheng-fu, Shi Peng, Chen Jian-fa, Sun Jian-bo, Dong Jin, Feng De-jun, Cheng Hua-yong . Gas composition and carbon isotopic fractionation characteristics of terrestrial Ordos shale gas:Implications for prediction of shale gas production over time[J]. Natural Gas Geoscience, 2016 , 27(6) : 1074 -1083 . DOI: 10.11764/j.issn.1672-1926.2016.06.1074

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