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Experimental study on gas content of adsorption and desorption in Fuling shale gas field
- Source :
- Journal of Petroleum Science and Engineering. 180:1069-1076
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Shale gas mainly exists in organic-rich shale in the form of free gas and adsorbed gas. Shale gas content has a direct impact on the productivity and life of the gas well, and is also an important indicator for areal selection and reservoir evaluation. Through the study of gas content experiments of shale gas, we can better guide the exploration and development of shale gas. According to the isothermal adsorption and desorption experiments of Wufeng-Longmaxi Formations in Jiaoshiba block of the Fuling shale gas field in Sichuan basin, China, 7 core samples from isothermal adsorption experiment and 30 core samples from desorption experiment were analyzed. The experimental results show that the isothermal adsorption experiment is an effective way to obtain Langmuir Volume (VL) and Langmuir Pressure (PL). The total gas content obtained from shale desorption experiment in the drilling site is mainly adsorption gas content, and the free gas content is relatively small. The desorption rate is different in different desorption stages, and the samples with higher total organic carbon (TOC) content have faster desorption rate and higher total desorption gas content. The carbon isotope value of methane gradually increases with the increase of desorption time. The results of methane isotope analysis in the desorption experiment are compared with the results of carbon isotope monitoring in the producing process. The findings reveal that after years of development in Jiaoshiba block of the Fuling shale gas field, the methane isotope in gas wells has basically remained unchanged, and the current gas production should be dominated by free gas.
- Subjects :
- Langmuir
Materials science
Analytical chemistry
02 engineering and technology
010502 geochemistry & geophysics
Geotechnical Engineering and Engineering Geology
01 natural sciences
Isothermal process
Methane
chemistry.chemical_compound
Fuel Technology
Adsorption
020401 chemical engineering
Volume (thermodynamics)
chemistry
Isotopes of carbon
Desorption
0204 chemical engineering
Oil shale
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 09204105
- Volume :
- 180
- Database :
- OpenAIRE
- Journal :
- Journal of Petroleum Science and Engineering
- Accession number :
- edsair.doi...........0dffa26ab807318e362c8dff3df51093