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Zhang W.,National Geological Library of China Geoscience Documentation Center
Frontiers of Earth Science | Year: 2013

It is well known that during CO2 geological storage, density-driven convective activity can significantly accelerate the dissolution of injected CO2 into water. This action could limit the escape of supercritical CO2 from the storage formation through vertical pathways such as fractures, faults and abandoned wells, consequently increasing permanence and security of storage. First, we investigated the effect of numerical perturbation caused by time and grid resolution and the convergence criteria on the dissolution-diffusion-convection (DDC) process. Then, using the model with appropriate spatial and temporal resolution, some uncertainty parameters investigated in our previous paper such as initial gas saturation and model boundaries, and other factors such as relative liquid permeability and porosity modification were used to examine their effects on the DDC process. Finally, we compared the effect of 2D and 3D models on the simulation of the DDC process. The above modeling results should contribute to clear understanding and accurate simulation of the DDC process, especially the onset of convective activity, and the CO2 dissolution rate during the convection-dominated stage. © 2013 Higher Education Press and Springer-Verlag Berlin Heidelberg. Source


Tian Q.-N.,National Geological Library of China Geoscience Documentation Center | Wang S.-L.,National Geological Library of China Geoscience Documentation Center | Zhang W.,National Geological Library of China Geoscience Documentation Center | Wang H.-H.,National Geological Library of China Geoscience Documentation Center | And 2 more authors.
Geological Bulletin of China | Year: 2014

Based on the literature database, the authors retrieved the relevant literatures of shale gas systematically, analyzed the shale gas literature published in China from 1990 to 2013, summarized the overall distribution of the literature and the development process of shale gas in China, and analyzed trends and issues which will be related to the utilization and development of shale gas in the future. The results indicate that the real situation of China's shale gas has not been fully understood, and the key technology of shale gas development has not been mastered. China has not formed a suitable theoretical and technological system for shale gas development. If we intend to develop the shale gas commercially on the basis of local businesses in China, much work has to be done, which, of course, needs quite a long time. Source

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