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Geofluids
Volume 2018, Article ID 3403026, 17 pages
https://doi.org/10.1155/2018/3403026
Research Article

The Controls of Pore-Throat Structure on Fluid Performance in Tight Clastic Rock Reservoir: A Case from the Upper Triassic of Chang 7 Member, Ordos Basin, China

1Division of Geology and Mineral Resources, CNNC Beijing Research Institute of Uranium Geology, No. 10 Anwai Xiaoguandongli, Chaoyang, Beijing 100029, China
2College of Geosciences, China University of Petroleum-Beijing, No. 18 Fuxue Road, Changping, Beijing 102249, China
3Research Center for Strategy of Global Mineral Resources, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Correspondence should be addressed to Yunlong Zhang; moc.oohay@gnahz.gnoly and Zhidong Bao; nc.ude.puc@dhzoab

Received 14 April 2017; Revised 18 August 2017; Accepted 22 October 2017; Published 16 January 2018

Academic Editor: Micol Todesco

Copyright © 2018 Yunlong Zhang 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

The characteristics of porosity and permeability in tight clastic rock reservoir have significant difference from those in conventional reservoir. The increased exploitation of tight gas and oil requests further understanding of fluid performance in the nanoscale pore-throat network of the tight reservoir. Typical tight sandstone and siltstone samples from Ordos Basin were investigated, and rate-controlled mercury injection capillary pressure (RMICP) and nuclear magnetic resonance (NMR) were employed in this paper, combined with helium porosity and air permeability data, to analyze the impact of pore-throat structure on the storage and seepage capacity of these tight oil reservoirs, revealing the control factors of economic petroleum production. The researches indicate that, in the tight clastic rock reservoir, largest throat is the key control on the permeability and potentially dominates the movable water saturation in the reservoir. The storage capacity of the reservoir consists of effective throat and pore space. Although it has a relatively steady and significant proportion that resulted from the throats, its variation is still dominated by the effective pores. A combination parameter (ε) that was established to be as an integrated characteristic of pore-throat structure shows effectively prediction of physical capability for hydrocarbon resource of the tight clastic rock reservoir.