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Energies 2017, 10(12), 1949; https://doi.org/10.3390/en10121949

Shale Gas Content Calculation of the Triassic Yanchang Formation in the Southeastern Ordos Basin, China

1
,
2,3
,
4,5
and
3,*
1
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2
School of Earth and Space Sciences, Peking University, Beijing 100871, China
3
Oil and Gas Research Center, Peking University, Beijing 100871, China
4
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
5
Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
*
Author to whom correspondence should be addressed.
Received: 28 September 2017 / Revised: 15 November 2017 / Accepted: 20 November 2017 / Published: 24 November 2017
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Abstract

Shale gas content is the key parameter for shale gas potential evaluation and favorable area prediction. Therefore, it is very important to determine shale gas content accurately. Generally, we use the US Bureau of Mines (USBM) method for coal reservoirs to calculate the gas content of shale reservoirs. However, shale reservoirs are different from coal reservoirs in depth, pressure, core collection, etc. This method would inevitably cause problems. In order to make the USBM method more suitable for shale reservoirs, an improved USBM method is put forward on the basis of systematic analysis of core pressure history and temperature history during shale gas degassing. The improved USBM method modifies the calculation method of the gas loss time, and determines the temperature balance time of water heating. In addition, we give the calculation method of adsorption gas content and free gas content, especially the new method of calculating the oil dissolved gas content and water dissolved gas content that are easily neglected. We used the direct method (USBM and the improved USBM) and the indirect method (including the calculation of adsorption gas, free gas and the dissolved gas method) to calculate the shale gas content of 16 shale samples of the Triassic Yanchang Formation in the Southeastern Ordos Basin, China. The results of the improved USBM method show that the total shale gas content is high, with an average of 3.97 m3/t, and the lost shale gas content is the largest proportion with an average of 62%. The total shale gas content calculated by the improved USBM method is greater than that of the USBM method. The results of the indirect method show that the total shale gas content is large, with an average of 4.11 m3/t, and the adsorption shale gas content is the largest proportion with an average of 71%. The oil dissolved shale gas content which should be paid attention to accounts for about 7.8%. The discrepancy between the direct method and indirect method is reduced by using the improved USBM method, and the improved USBM method could be more practical and accurate than the USBM method. View Full-Text
Keywords: shale gas; lost shale gas content; oil dissolved shale gas content; improved USBM method; Ordos Basin shale gas; lost shale gas content; oil dissolved shale gas content; improved USBM method; Ordos Basin
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Su, J.; Shen, Y.; Hao, J.; Liu, B. Shale Gas Content Calculation of the Triassic Yanchang Formation in the Southeastern Ordos Basin, China. Energies 2017, 10, 1949.

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