Anomalies of natural gas compositions and carbon isotope ratios caused by gas diffusion – A case from the Donghe Sandstone reservoir in the Hadexun Oilfield, Tarim Basin, northwest China

[Display omitted] •We report abnormal gases which have rarely be observed in other basins globally.•Anomalies of gas compositions are caused by gas diffusion through caprock.•Gas diffusion through caprock can cause large variations in δ13C value reaching 10‰.•Gas exploration target in the Hadexun Oi...

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Bibliographic Details
Published in:Journal of Asian earth sciences 2018-05, Vol.156, p.75-89
Main Authors: Wang, Yangyang, Chen, Jianfa, Pang, Xiongqi, Zhang, Baoshou, Wang, Yifan, He, Liwen, Chen, Zeya, Zhang, Guoqiang
Format: Article
Language:English
Subjects:
Carbon isotope ratios
Donghe sandstone reservoir
Gas diffusion
Hadexun oilfield
Natural gas
Tarim basin
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Summary:[Display omitted] •We report abnormal gases which have rarely be observed in other basins globally.•Anomalies of gas compositions are caused by gas diffusion through caprock.•Gas diffusion through caprock can cause large variations in δ13C value reaching 10‰.•Gas exploration target in the Hadexun Oilfield is the area with high quality caprock. Natural gases in the Carboniferous Donghe Sandstone reservoir within the Block HD4 of the Hadexun Oilfield, Tarim Basin are characterized by abnormally low total hydrocarbon gas contents (
ISSN:1367-9120
1878-5786
DOI:10.1016/j.jseaes.2018.01.002