Journal ArticleDOI
Mechanisms of shale gas storage: Implications for shale gas exploration in China
Fang Hao,Huayao Zou,Yongchao Lu +2 more
TLDR
In this paper, two models were proposed to predict the variation of gas sorption capacity and total gas content over geologic time as a function of burial history, and the results showed that the changes in GSC of organic-rich shales are quite low at an elevated temperature and pressure and with the presence of moisture.Abstract:
This article reviews the mechanisms of shale gas storage and discusses the major risks or uncertainties for shale gas exploration in China. At a given temperature and pressure, the gas sorption capacities of organic-rich shales are primarily controlled by the organic matter richness but may be significantly influenced by the type and maturity of the organic matter, mineral composition (especially clay content), moisture content, pore volume and structure, resulting in different ratios of gas sorption capacity (GSC) to total organic carbon content for different shales. In laboratory experiments, the GSC of organic-rich shales increases with increasing pressure and decreases with increasing temperature. Under geologic conditions (assuming hydrostatic pressure gradient and constant thermal gradient), the GSC increases initially with depth due to the predominating effect of pressure, passes through a maximum, and then decreases because of the influence of increasing temperature at greater depth. This pattern of variation is quite similar to that observed for coals and is of great significance for understanding the changes in GSC of organic-rich shales over geologic time as a function of burial history. At an elevated temperature and pressure and with the presence of moisture, the gas sorption capacities of organic-rich shales are quite low. As a result, adsorption alone cannot protect sufficient gas for high-maturity organic-rich shales to be commercial gas reservoirs. Two models are proposed to predict the variation of GSC and total gas content over geologic time as a function of burial history. High contents of free gas in organic-rich shales can be preserved in relatively closed systems. Loss of free gas during postgeneration uplift and erosion may result in undersaturation (the total gas contents lower than the sorption capacity) and is the major risk for gas exploration in marine organic-rich shales in China.read more
Citations
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Supercritical High-Pressure Methane Adsorption on the Lower Cambrian Shuijingtuo Shale in the Huangling Anticline Area, South China: Adsorption Behavior, Storage Characteristics, and Geological Implications
TL;DR: In this paper, supercritical high-pressure methane (CH4) adsorption analysis was performed to investigate the gas adaption behavior and storage capacities of the Lower Cambrian Shuijingtuo Shale in the Huanglin...
Journal ArticleDOI
Investigating the Pore Structure Characteristics and Reservoir Capacities of Lower Jurassic Continental Shale Reservoirs in the Northeastern Sichuan Basin, China
TL;DR: In this article , the pore structure of the Lower Jurassic shale in the northeastern Sichuan Basin was investigated and the results showed that the clay mineral content of the continental shale is high.
Pore systems of the B chalk and lower a marl zones of the Niobrara Formation, Denver-Julesburg Basin, Colorado
TL;DR: In this paper, a focused ion-beam scanning electron microscopy (FIB-SEM) and Avizo Fire image segmenting software were used to identify, characterise, and analyze the pore systems of the Niobrara Formation, and explore the linkage between measurable rock properties and the observed pore system.
Journal ArticleDOI
Comparative Study and Analysis of the Development of Shale Gas between China and the USA
Qianqian Wang,Lu Wang +1 more
TL;DR: In this article, the authors present the importance of the formation principle of shale gas and the energy application, and compare the progress of the shale gas studies, exploitation technology as well as the study hot-points between China and USA.
Journal ArticleDOI
Analysis on the difference of material composition and reservoir space of Mesoproterozoic dark marine shale in the Yanshan area
TL;DR: The dark marine shales which are thick in the Mesoproterozoic Hongshuizhuang formation and Xiamaling Formation in the Yanshan area are the subject of as discussed by the authors.
References
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Journal ArticleDOI
Unconventional shale-gas systems: The Mississippian Barnett Shale of north-central Texas as one model for thermogenic shale-gas assessment
TL;DR: In this article, the authors estimate that the Barnett Shale has a total generation potential of about 609 bbl of oil equivalent/ac-ft or the equivalent of 3657 mcf/acft (84.0 m 3 /m 3 ).
Journal ArticleDOI
Morphology, Genesis, and Distribution of Nanometer-Scale Pores in Siliceous Mudstones of the Mississippian Barnett Shale
TL;DR: In this article, the authors used scanning electron microscopy to characterize the pore system in the Barnett Shale of the Fort Worth Basin, Texas, showing that the pores in these rocks are dominantly nanometer in scale (nanopores).
Journal ArticleDOI
Fractured shale-gas systems
TL;DR: The first commercial United States natural gas production (1821) came from an organic-rich Devonian shale in the Appalachian basin this article, which is a continuous-type biogenic (predominant), thermogenic, or combined biogenic-thermogenic gas accumulations characterized by widespread gas saturation, subtle trapping mechanisms, seals of variable lithology, and relatively short hydrocarbon migration distances.
Journal ArticleDOI
The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs
Daniel J.K. Ross,R. Marc Bustin +1 more
TL;DR: The effect of shale composition and fabric upon pore structure and CH 4 sorption is investigated for potential shale gas reservoirs in the Western Canadian Sedimentary Basin (WCSB) as mentioned in this paper.
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