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Zhu P.,China University of Petroleum - East China | Lin C.,China University of Petroleum - East China | Lin C.,The key Laboratory of Reservior Geology in Shandong Province | Ren H.,China University of Petroleum - East China | And 3 more authors.
Journal of Natural Gas Science and Engineering | Year: 2015

As a key factor during the development of tight sandstone reservoirs, the property of fractures and micro-fractures has a significant effect on the permeability. However, it is very hard to describe the property by conventional well logs. Using the core and microscopic thin section of a tight sandstone reservoir in the Permian of Upper Palaeozoic in Ordos Basin, we analyse the distribution of the micro-fractures in the cores and the effects of micro-fractures on porosity, permeability, pore-structure and microscopic heterogeneity. The results show that micro-fractures effectively improve the connectivity of the tight sandstone reservior, which also results in the strong reservoir micro-heterogeneity and complex pore structures. We find that relative large permeability appears in the core samples with micro-factures and the contribution curves of permeability of these samples in mercury injection test also exhibit apparent an abnormality. Based on the analysis, we proposed a method to establish a quantitative recognition criterion of micro-fractures in tight sandstone reservoirs by using a concentration function which reflects the spatial distribution of element fields to describe the contribution curve of permeability quantitatively. © 2015 Elsevier B.V. Source

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