Research on reservoir characteristics of Chang7 tight oil based on nano-CT
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ICCESEN 2017
Research on reservoir characteristics of Chang7 tight oil based on nano-CT Lei Song 1 & Zhengfu Ning 1 & Lian Duan 1 Received: 22 December 2017 / Accepted: 16 August 2018 # Saudi Society for Geosciences 2018
Abstract The microstructure characteristics of the reservoir are closely related to the seepage capacity of the reservoir. Compared with conventional reservoirs and low permeability reservoirs, the tight oil is stored in a smaller nanoporous space. The microscopic pore structure of reservoir is the geometrical shape, size, distribution, and interconnected relationship of porosity and throat. The experiment was conducted on several tight rock samples taken from the Chang 7 formation in Xunyi county of Ordos Basin, China. Based on nano-CT scanning and advanced image processing technology Avizo, we build a three-dimensional comprehensive pore and throat network model. In the result of our study, reservoir space types are dissolution pores with mineral particles inside in the pore network model. Then, the pore throat morphology in the forms of small globular and tubular with SEM was explained. There is a big difference in quantity distribution at different locations, which is limited to the permeability of samples. Pore types are mostly round tubular and long tubular, while isolated pores account for a significant proportion. Through making and analyzing the three-dimensional structure of interconnected pores, obtained their specific forms and the division of connectivity types. Keywords Tight oil reservoir . Nano-CT scanning . Pore structure . Pore microcosmic morphology
PACS 61.05.−a61.43.Bn81.70.Cv81.16.Rf
Introduction In recent years, influenced by increasing demand of global energy, unconventional reservoir has become a new hotspot in the past decade due to its enormous exploration potential. Tight oil (such as Bakken oil in Williston basin, North America) and Eagle Ford oil (South Texas, USA) had been exploited commercially with the successful application of horizontal drilling and multistage hydraulic fracturing technology. Tight oil reservoir has become the focus of research in global petroleum geology. Tight sandstones and shale stored a considerable amount of hydrocarbon in their pore networks (Liu et al. 2016; Butcher and Lemmens 2011; Didar and This article is part of the Topical Collection on Geo-Resources-EarthEnvironmental Sciences * Lei Song [email protected] 1
School of Petroleum Engineering, China University of Petroleum, Beijing, China
Akkutlu 2013). Only by understanding the structure of reservoir can make more accurate predictions of tight oil (Kou et al. 2016). Contrast to conventional hydrocarbon resources, the pore structure of tight reservoirs was difficult to characterize because of the ultra-fine pore throat (Clarkson et al. 2012). Reservoir structure affects water flooding development (Hadia et al. 2012), and reservoir structure has an important impact on the final development of tight oil reservoirs (Desbois et al. 2011; Slatt and O’Brien 2011). Currently, there are
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