Influencing Factors and Distributions of the Oil Dissolved Shale Gas Contentof Member Chang 7 Shale in Xiasiwan Area,Ordos Basin

WANG Xiang-zeng，HAO Jin，JIANG Zhen-xue，GUO Chao，XING Jin-yan，LI Zhuo，TANG Xiang-lu

doi:10.11764/j.issn.1672-1926.2015.04.0744

2015 , Vol. 26 >Issue 4: 744 - 753

DOI: https://doi.org/10.11764/j.issn.1672-1926.2015.04.0744

Influencing Factors and Distributions of the Oil Dissolved Shale Gas Contentof Member Chang 7 Shale in Xiasiwan Area,Ordos Basin

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1.Yanchang Petroleum(Group) Co.Ltd.,Xi′an 710075,China;
2.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;
3.Unconventional Natural Gas Institute,China University of Petroleum,Beijing 102249,China;
4.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
5.China Huadian Institute of Science & Technology,Beijing 100160,China

Received date: 2014-09-14

Revised date: 2014-09-29

Online published: 2015-04-10

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Abstract

The oil dissolved shale gas of shale reservoirs dominated by of oil generation during the mature stage is poorly studied for the shale gas resources currently.The influencing factors of the oil dissolved shale gas are residual oil content in shale reservoirs and solubility of residual oil dissolved natural gas according to the principle of “similarity and intermiscibility”.In order to further study the influencing factors and distribution of the oil dissolved shale gas content,this study conducts organic geochemical analysis,reservoir porosity analysis,isothermal adsorption experiment and log interpretation of part of member Chang 7 shale samples in Xiasiwan area,Ordos Basin.The result shows that member Chang 7 shale in Xiasiwan area has the geological basis to generate enormous oil dissolved shale gas.The oil dissolved shale gas content of member Chang 7 shale in Xiasiwan area is large,ranging from 0.18-0.52m³/t,with an average of 0.34m³/t and an average proportion of the total gas content of 9%.The result also shows that submember 7₃ is the most advantage interval of the oil dissolved shale gas and the oil dissolved shale gas content is more than 0.5m³/t in the southwestern of submember 7₃which is the most favorable region of oil dissolved shale gas.In conclusion,the oil dissolved shale gas is noteworthy shale gas resources when we evaluate the shale gas resources of member Chang 7 shale in Xiasiwan area,Ordos Basin.

Key words： The oil dissolved shale gas; Gas content; Ordos Basin; Member Chang 7

Cite this article

WANG Xiang-zeng，HAO Jin，JIANG Zhen-xue，GUO Chao，XING Jin-yan，LI Zhuo，TANG Xiang-lu . Influencing Factors and Distributions of the Oil Dissolved Shale Gas Contentof Member Chang 7 Shale in Xiasiwan Area,Ordos Basin[J]. Natural Gas Geoscience, 2015 , 26(4) : 744 -753 . DOI: 10.11764/j.issn.1672-1926.2015.04.0744

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