Characterizing the Role of Desorption in Gas Production from Devonian Shales

Lane, H.S.; Lancaster, D.E.; Watson, A. T.

doi:10.1080/00908319108908993

Cited by 19 publications

(7 citation statements)

References 9 publications

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“…MSB is also used to conduct the desorption experiments. Desorption velocity, which is an important parameter of shale gas desorption, is the ratio of desorbed gas volume to time [23] [24] [25]. The expression is v V t = ), V represents the desorption volume (mL/g), and t represents the time interval for desorption balance(h).…”

Section: Results Of Isothermal Adsorption and Desorptionmentioning

confidence: 99%

Isothermal Adsorption and Desorption Properties of Marine Shales on Longmaxi Shale in South China

Chang¹,

Shu²,

Ma³

et al. 2017

OJG

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The investigation of adsorption and desorption properties of shale are important for estimating reserves and exploitation. The shale samples used in this paper were from the marine shale on Longmaxi shale in Sichuan and Hubei province, China. A series of analyses, such as organic carbon content test, vitrinite reflectance test, rock pyrolysis, X-ray diffraction, and N 2 /CO 2 adsorption were performed. Gravimetric method with magnetic suspension balance was used to conduct isothermal adsorption and desorption experiments. The Langmuir, Freundlich, Langmuir-Freundlich, D-R, semi-pore, and Tothequations were used to fit the isothermal adsorption and desorption curves. And adsorption potential theory was used to explain the adsorption and desorption process. According to the results, the shale samples have a high level of organic carbon content with the same organic matter type II1 and high degree of maturation. The volume of adsorption increases rapidly and slows down to stable with the pressure increasing. Desorption is the inverse process of adsorption and 10 MPa -0.5 MPa is the main period of shale gas desorption. The fitting results show that three-parameter isotherm equations are better than the two-parameter ones. The adsorption temperature has a great influence on adsorption volume, little effect on potential energy. Adsorption potential varies under different TOC to affect adsorption properties. Moreover, a large adsorption potential means that the gas molecule is easy to adsorb but difficult to desorb.

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Section: Results Of Isothermal Adsorption and Desorptionmentioning

confidence: 99%

Isothermal Adsorption and Desorption Properties of Marine Shales on Longmaxi Shale in South China

Chang¹,

Shu²,

Ma³

et al. 2017

OJG

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“…The sorption capacity of shales is largely controlled by TOC content, clay minerals and micropore structure in shales Bowker, 2003;Chalmers and Bustin, 2008b;Curtis, 2002;Harris et al, 1970;Hill et al, 2007;Jarvie et al, 2007;Javadpour et al, 2007;Jenkins and Boyer, 2008;Manger et al, 1991;Montgomery et al, 2005;Passey et al, 2010;Pollastro et al, 2003;Ramos, 2004;Bustin, 2007, 2008). The TOC content or organic matter (OM) abundance is one of the key factors for shale gas potential and this is because OM is not only the source of generating hydrocarbon gases, which determines the intensity of gas generation, but also is one of the major components of adsorbed methane (Andrea and Philp, 2012;Hill et al, 2007;Kuuskraa et al, 1985;Lane et al, 1991;Rodriguez and Paul, 2010). The OM type (or kerogen type) and the thermal maturity also play important role in the MSC of shales (Bowker, 2007;Bustin, 2007, 2008a; David et al, 2004;Jarvie et al, 2003;Lu et al, 1995;Manger et al, 1991;Ramos, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Shale gas commonly occurs in the forms of sorbed and free methane with the sorbed gas varying from 20 to 85% of total gas capacity in shales (Lane et al, 1991;Curtis, 2002). Therefore the methane sorption capacity (MSC) of shales is often regarded as a key indicator of the gas capacity of shales.…”

Section: Introductionmentioning

confidence: 99%

The methane sorption capacity of Paleozoic shales from the Sichuan Basin, China

Wang

Song

Cao

et al. 2013

Marine and Petroleum Geology

164

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“…The simulated results were fairly insensitive to fracture porosity because of the relatively small amount of fluid contained in that region. Langmuir isotherms fitted to the gas storages (Lane et al, 1991a) in Table 2 were used to represent the condensed-phase isotherms.…”

Section: Estimation Of Matrix Propertiesmentioning

confidence: 99%

“…In addition to conventional storage as "free" gas in the pore space, significant amounts of gas are stored as a condensed phase due to gas adsorption on matrix surfaces and/ or solution in organic material. Studies have indicated that 50% or more of the natural gas stored in Devonian shales may exist as a condensed phase (Thomas and Frost, 1989;Lane et al, 1991a). These unconventional resources are typically fractured.…”

Section: Introductionmentioning

confidence: 97%

X‐ray computed tomography studies of gas storage and transport in Devonian shales

Lu¹,

Peng²,

Watson³

et al. 1994

AIChE Journal

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Devonian shales and other unconventional resources can be highly fractured and may have significant amounts of gas stored by adsorption. Conventional experiments are not well suited for characterizing the properties important for describing gas storage and transport in these media. Here, X‐ray computed tomography scanning is used to determine gas storage in dynamic gas flow experiments on Devonian shale samples. Several important properties are obtained from these experiments, including fracture widths, adsorption isotherms, and matrix porosities and permeabilities.

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Characterizing the Role of Desorption in Gas Production from Devonian Shales

Cited by 19 publications

References 9 publications

Isothermal Adsorption and Desorption Properties of Marine Shales on Longmaxi Shale in South China

Isothermal Adsorption and Desorption Properties of Marine Shales on Longmaxi Shale in South China

The methane sorption capacity of Paleozoic shales from the Sichuan Basin, China

X‐ray computed tomography studies of gas storage and transport in Devonian shales

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