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Journal of Engineering
Volume 2017, Article ID 6705263, 9 pages
https://doi.org/10.1155/2017/6705263
Research Article

Advantageous Reservoir Characterization Technology in Extra Low Permeability Oil Reservoirs

1University of Chinese Academy of Sciences, Beijing 100190, China
2PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China
3PetroChina Dagang Oilfield Company, Tianjin 300280, China

Correspondence should be addressed to Yutian Luo; nc.moc.anihcortep@naituyoul

Received 17 April 2017; Revised 22 August 2017; Accepted 7 September 2017; Published 12 October 2017

Academic Editor: Runcang Sun

Copyright © 2017 Yutian Luo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper took extra low permeability reservoirs in Dagang Liujianfang Oilfield as an example and analyzed different types of microscopic pore structures by SEM, casting thin sections fluorescence microscope, and so on. With adoption of rate-controlled mercury penetration, NMR, and some other advanced techniques, based on evaluation parameters, namely, throat radius, volume percentage of mobile fluid, start-up pressure gradient, and clay content, the classification and assessment method of extra low permeability reservoirs was improved and the parameter boundaries of the advantageous reservoirs were established. The physical properties of reservoirs with different depth are different. Clay mineral variation range is 7.0%, and throat radius variation range is 1.81 μm, and start pressure gradient range is 0.23 MPa/m, and movable fluid percentage change range is 17.4%. The class IV reservoirs account for 9.56%, class II reservoirs account for 12.16%, and class III reservoirs account for 78.29%. According to the comparison of different development methods, class II reservoir is most suitable for waterflooding development, and class IV reservoir is most suitable for gas injection development. Taking into account the gas injection in the upper section of the reservoir, the next section of water injection development will achieve the best results.