Numerical and experimental study of oil transfer in laminated shale

Zhu, Chaofan; Sheng, James J.; Ettehadtavakkol, Amin; Li, Yajun; Dong, Mingzhe

doi:10.1016/j.coal.2019.103365

Cited by 20 publications

(15 citation statements)

References 34 publications

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“…Laminae are common sedimentary structures in nature and are formed by the compositional layering from different mechanisms including depositional, diagenesis, biological activity, clay mineral alignment, and/or the lenticular distribution of organic matters (O'Brien, 1990;Schieber, 1998;Yawar and Schieber, 2017). The roles of shale laminae on gas migration and accumulation have been well documented (O'Brien, 1990;Liang et al, 2018;Wang C. et al, 2019;Zhu et al, 2020). Shale laminae in the Longmaxi Formation in the Fuling gas field have been categorized into three types (Wang C. et al, 2019) based on lamina density and the maximum thickness of individual laminae, and the pore structures are found to be strongly affected by lamina types.…”

Section: Impact Of Lamina On Pore Connectivitymentioning

confidence: 99%

Pore Connectivity Characterization Using Coupled Wood’s Metal Intrusion and High-Resolution Imaging: A Case of the Silurian Longmaxi Shales From the Sichuan Basin, China

Liu

Fan

et al. 2021

Front. Earth Sci.

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Pore connectivity is crucial for shale gas production. However, the three-dimensional (3D) characteristics and distribution of pore networks and, more fundamentally, the underlying role of different pore types on pore connectivity in shales are inadequately understood. By comparing the 3D pore connectivity derived from direct microstructural imaging of pores filled with Wood’s metal at a pressure corresponding to the finest accessible pore throat in the resolution ranges that may be achieved by X-ray micro-CT and SEM, it is possible to evaluate pore connectivity of different types of shales. The pore connectivity of three shales including a mixed mudstone, siliceous shale, and argillaceous shale from the Silurian Longmaxi Formations is investigated via combined broad ion beam (BIB) polishing, and SEM and X-ray micro-CT imaging after Wood’s metal injection at a pressure up to 380 MPa. The three shales show significant differences in pore connectivity. The mixed mudstone shows excellent pore connectivity in the matrix; the siliceous shale shows an overall poor connectivity with only a small amount of OM (organic matter) pores immediately adjacent to microfractures displaying interconnectivity, while the pores in the argillaceous shale, dominated by plate-like clay pores, are largely not interconnected.

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Section: Impact Of Lamina On Pore Connectivitymentioning

confidence: 99%

Pore Connectivity Characterization Using Coupled Wood’s Metal Intrusion and High-Resolution Imaging: A Case of the Silurian Longmaxi Shales From the Sichuan Basin, China

Liu

Fan

et al. 2021

Front. Earth Sci.

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“…Once an oil droplet is placed onto a rock surface, it will spread into a flat oil film immediately to reach the minimum energy state in the system. − Therefore, it is reasonable to assume θ A as 0° in this case. The oil imbibition volume as a function of the square root of time is plotted in Figure for the datasets collected from Zhu et al…”

Section: Resultsmentioning

confidence: 99%

“… N -dodecane imbibition volume as a function of the square root of time for Y1 and Y2 core plugs under vacuum conditions. Experimental data were collected from Zhu et al Dots represent experimental data and lines are used to guide the eyes.…”

Section: Resultsmentioning

confidence: 99%

“… a Information on M3 and M4 core plugs was compiled from Pan et al; , information on Y1 and Y2 core plugs was compiled from Zhu et al b Gas permeability was measured with core plugs using the pulse-decay permeability method c Pore throat radii were determined using a modified Winland-style correlation …”

Section: Methodsmentioning

confidence: 99%

“…When units are considered (see Table 3), the liquid permeability in tight and shale core plugs can be determined by eq 7 ( ) Information on M3 and M4 core plugs was compiled from Pan et al; 51,52 information on Y1 and Y2 core plugs was compiled from Zhu et al 54 Table 3. Units Used in Equation 7parameter unit square root of time is linear at early stages, and therefore, the corresponding slopes are determined graphically in Figure 2.…”

Section: Theoretical Modelmentioning

confidence: 99%

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Liquid Permeability Determination from Vacuum Imbibition in Tight/Shale Core Plugs

et al. 2023

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Liquid permeability is a key petrophysical parameter that quantifies the ability of a liquid to flow through porous rock/ soil and can be used in determining the efficiency of many subsurface processes, including enhanced hydrocarbon recovery, groundwater transport, carbon dioxide geostorage, underground hydrogen storage, etc. However, it is time-consuming (usually >16−240 h) and challenging to measure the liquid permeability for tight/shale rocks, particularly when the permeability is 100 nD or lower. The objective of this study is to develop a rapid and simple approach to determine liquid (brine or oil) permeability in tight siltstones/shales. Specifically, the developed method is based on the combination of one-dimensional (1D) vacuum imbibition experiments in tight/shale core plugs and a modified Lucas− Washburn model. For our proof-of-concept study, the results have demonstrated that (1) only 44−116 h are required to determine the liquid permeability (98−608 nD) for the analyzed samples from the Montney and Yanchang Formations; and (2) the acquired brine permeability was 28.3−28.5% lower than the slip-corrected nitrogen (N 2 ) permeability derived from the pulse-decay permeability tests. This is the first attempt to determine the absolute permeability of a liquid according to a 1D vacuum imbibition experiment and theory. This study provides a promising technique for the fast characterization of ultratight formation permeability of around 100 nD.

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Evolution of organic carbon isotopes during the pyrolysis of Nongan oil shale in Songliao Basin and its implications for in-situ conversion project

Shan

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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Mastering the reaction process of underground pyrolysis is the key to oil shale in-situ conversion project. The progress of the pyrolysis reaction can be analyzed by the information of the kerogen maturity in the reaction formation. However, it is difficult to directly test the kerogen maturity by drilling and coring in in-situ conversion project. And the research on judging the process of underground pyrolysis reaction according to the maturity of oil and gas products has not been carried out in depth. This project intends to take the oil shale of the Nenjiang Formation in the southern Songliao Basin and the pyrolysis oil samples produced by the in-situ conversion project as the research object, and conduct simulation experiments and test analysis. The purpose of this paper is to identify the dynamic evolution characteristics of carbon isotope fractionation during the evolution of oil shale pyrolysis hydrocarbon products, and then establish the response relationship with the process of oil shale organic matter pyrolysis. This study has formed a set of dynamic monitoring methods for the in-situ conversion of oil shale to organic matter pyrolysis reaction process, and laid a theoretical foundation for the efficient, economical and stable operation of oil shale in-situ conversion projects.

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Numerical and experimental study of oil transfer in laminated shale

Cited by 20 publications

References 34 publications

Pore Connectivity Characterization Using Coupled Wood’s Metal Intrusion and High-Resolution Imaging: A Case of the Silurian Longmaxi Shales From the Sichuan Basin, China

Pore Connectivity Characterization Using Coupled Wood’s Metal Intrusion and High-Resolution Imaging: A Case of the Silurian Longmaxi Shales From the Sichuan Basin, China

Liquid Permeability Determination from Vacuum Imbibition in Tight/Shale Core Plugs

Evolution of organic carbon isotopes during the pyrolysis of Nongan oil shale in Songliao Basin and its implications for in-situ conversion project

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