Geological models of gas in place of the Longmaxi shale in Southeast Chongqing, South China

Pan, Lei; Xiao, Xia; Tian, Hui; Zhou, Qinling; Cheng, Peng

doi:10.1016/j.marpetgeo.2016.03.018

Cited by 108 publications

(101 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Black shales are present in the Lower Silurian Longmaxi formation in the Upper Yangtze Platform with current burial depth of 1000-5000 m (Pan et al, 2016). The thickness generally ranges from 50 to 100 m with an EqRo of 2.5-3.0%, generating mainly dry gas and secondary gas (Tan et al, 2014;Pan et al, 2016).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative characterization of micropore structure for organic-rich Lower Silurian shale in the Upper Yangtze Platform, South China: Implications for shale gas adsorption capacity

Chen

Jiang

Liu

et al. 2017

Adv. Geo-Energ. Res.

View full text Add to dashboard Cite

The pores in shales are mainly of nanometer-scale, and their pore size distribution is very important for shale gas storage and adsorption capacity, especially micropores having widths less than 2 nm, which contribute to the main occurrence space for gas adsorption. This study is focused on the organic-rich Lower Silurian black shale from four wells in the Upper Yangtze Platform, and their total organic carbon (TOC), mineralogical composition and micropore characterization were investigated. Low pressure CO2 adsorption measurement was conducted at 273.15 K in the relative pressure range of 0.0001-0.03, and the micropore structure was characterized by Dubinin-Radushkevich (DR) equation and density functional theory (DFT) method and then the relationship between micropore structure and shale gas adsorption capacity was discussed. The results indicated that (1) The Lower Silurian shale have high TOC content in the range of 0.92-4.96%, high quartz content in the range of 30.6-69.5%, and high clays content in the range of 24.1-51.2%. The TOC content shows a strong positive relationship with the quartz content which suggests that the quartz is mainly biogenic in origin. (2) The micropore volume varies from 0.12 cm 3 /100 g to 0.44 cm 3 /100 g and micropore surface area varies from 4.97 m 2 /g to 17.94 m 2 /g. Both of them increase with increasing TOC content, indicating TOC is the key factor to control the micropore structure of the Lower Silurian shale. (3) Low pressure CO2 adsorption measurement provides the most suitable detection range (0.3-1.5 nm) and has high reliability and accuracy for micropore structure characterization. (4) The TOC content is the key factor to control gas adsorption capacity of the Lower Silurian shale in the Upper Yangtze Platform.

show abstract

Section: Geological Setting and Samplesmentioning

confidence: 99%

“…The thickness generally ranges from 50 to 100 m with an EqRo of 2.5-3.0%, generating mainly dry gas and secondary gas (Tan et al, 2014;Pan et al, 2016).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

Quantitative characterization of micropore structure for organic-rich Lower Silurian shale in the Upper Yangtze Platform, South China: Implications for shale gas adsorption capacity

Chen

Jiang

Liu

et al. 2017

Adv. Geo-Energ. Res.

View full text Add to dashboard Cite

show abstract

“…For all samples, the experimental temperature was 60°C and the pressure was up to 25 MPa. The detailed experimental procedures for the magnetic suspension balance equipment have been well documented in a series of publications (Pan et al., 2016; Yang et al., 2014; Zhou et al., 2018).…”

Section: Methodology and Experimentsmentioning

confidence: 99%

A new method to determine varying adsorbed density based on Gibbs isotherm of supercritical gas adsorption

Cai

Zhuang

et al. 2018

Adsorption Science & Technology

View full text Add to dashboard Cite

In the calculation of the absolute adsorption of supercritical gas adsorbed on the microporous materials, most existing methods regard the adsorbed density as a constant, which is very unreasonable. In this study, an extended pressure point method combined with Langmuir adsorption model is proposed in which the varying adsorbed density under different pressures is considered at the same time. The utility of the proposed method to correlate accurately the experimental data for supercritical gas adsorption system is demonstrated by high-pressure methane adsorption measurements on two groups of shale samples. Taking advantage of the proposed method, we can obtain the adsorbed density and the adsorbed volume corresponding to different pressures. Compared with the conventional methods under the assumption of fixed and parameterized adsorbed density, the proposed method yields better fitting results with the experimental data. Our work should provide important fundamental understandings and insights into the supercritical gas adsorption system.

show abstract

“…Strong correlations between total gas and TOC (R 2 of approximately 0.7-0.9) were also found from canister desorption of fresh cores from the Devonian-Mississippian New Albany Shale in the Illinois Basin, United States (Strapoc et al, 2010), indicating that the organic matter content is primarily responsible for total gas content in these shale samples. Based on the experiments of high-pressure methane adsorption of the Longmaxi shale samples, Pan et al (2016) found that the adsorbed gas capacity of the samples positively correlated to TOC. The quantity of organic matter in shales not only determines hydrocarbon generation potential but also creates abundant organic nanopores, which provide more internal surface area and promote shale gas adsorption (Sun et al, 2015).…”

Section: The Content and Constraints Of Desorbed Gasmentioning

confidence: 99%

Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China

Sun

Wang

Wei

et al. 2017

Energy Exploration & Exploitation

View full text Add to dashboard Cite

The Lower Permian Shanxi Formation marine-continental transitional organic-rich shale is one of the most important potential shale gas plays in the Ordos Basin, China. However, the content and origin of desorbed gas from the Shanxi Formation are poorly documented, limiting the understanding of gas generation and potential play elements. Geochemical characteristics of desorbed gas, including content and origin, are analyzed from 17 core samples of the Shanxi Formation from well SL-1. The results show that the Shanxi Formation shales in the study area are characterized by high total organic carbon content of 1.17-2.63%, type III organic matter, and high T max between 493 and 513 C. The desorbed gas content of the shale samples varies from 0.22 to 0.50 m 3 /t, with an average of 0.37 m 3 /t, and shows a positive correlation with total organic carbon. The gases are dominated by methane (69.57-89.02%), with small amounts of ethane (0.01-0.09%). The carbon isotopic signature d 13 C 1 ranges from À49.5 to À45.3%, and the d 13 C 2 ranges from À23.3 to À14.7%. In addition, gases released from the Shanxi Formation core samples are thermogenic in origin and possibly coal derived, as the Whiticar chart and the diagram of ethane versus d 13 C 2 suggest.

show abstract

Geological models of gas in place of the Longmaxi shale in Southeast Chongqing, South China

Cited by 108 publications

References 56 publications

Quantitative characterization of micropore structure for organic-rich Lower Silurian shale in the Upper Yangtze Platform, South China: Implications for shale gas adsorption capacity

Quantitative characterization of micropore structure for organic-rich Lower Silurian shale in the Upper Yangtze Platform, South China: Implications for shale gas adsorption capacity

A new method to determine varying adsorbed density based on Gibbs isotherm of supercritical gas adsorption

Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China

Contact Info

Product

Resources

About