Journal
FUEL
Volume 187, Issue -, Pages 285-295Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2016.09.072
Keywords
In-situ gas desorption; Occurrence stage; Methane adsorption ability; Pore size distribution; Shale gas reservoir
Categories
Funding
- National Natural Science Foundation of China [41472112, U1562215]
- China Shale Gas Geological Survey [12120114046701]
- Chongqing Institute of Geology and Mineral Resources
Ask authors/readers for more resources
In-situ shale gas extraction provides direct evidence in response to gas-bearing evaluations and productivity predictions regarding shale gas reservoirs. The desorption characteristics and origin of in-situ shale gas extraction in the lower Cambrian Shuijingtuo Formation of the Sichuan Basin are studied via in-situ gas desorption tests. Tests are conducted at both reservoir (35 degrees C) and high temperatures (90 degrees C). The results indicate that most in-situ shale gas is quickly desorbed within 300 min at both the reservoir temperature desorption stage and the high temperature desorption stage. In both instances, the in-situ gas desorption rates decrease rapidly over time. In addition, the desorbed gas content and desorption rate at the reservoir temperature desorption stage are both clearly lower than the equivalent measures at the high temperature desorption stage. The in-situ desorbed gas from the reservoir temperature desorption stage is mainly free gas; the in-situ desorbed gas from the high temperature desorption stage, on the other hand, is mainly sorbed gas, which is the dominant form in the in-situ shale gas. The percentage of in-situ desorbed gas at these two stages is mainly controlled by gas adsorption, pore volume, and specific surface area. The desorption rate of in-situ shale gas is likely controlled primarily by average pore size and methane adsorption. (C) 2016 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available