Characteristics of micro- and nano-pores in shale oil reservoirs
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ORIGINAL PAPER-PRODUCTION ENGINEERING
Characteristics of micro‑ and nano‑pores in shale oil reservoirs Debin Xia1 · Zhengming Yang2 · Tiening Gao1 · Haibo Li2 · Wei Lin3 Received: 20 June 2020 / Accepted: 20 September 2020 © The Author(s) 2020
Abstract Porosity is the most common form of reservoirs, and its size, shape, and connectivity directly affect the capacity of oil and gas storage and production. To study the micro–nano-pore structure characteristics of shale oil reservoirs and quantitatively characterize its heterogeneity, this work uses high-precision high-pressure mercury intrusion (HPMI) experimental techniques to study the micro–nano-pore structure characteristics of shale oil, and based on the experimental data, fractal theory is used to quantitatively characterize its heterogeneity. The results of the study show that the micro–nano-pores in the shale oil reservoir are concentrated and continuous, and the pore radius is mainly distributed among the range of 30–500 nm, nanoscale pores are an important part of the pores of the shale oil reservoir. The fractal dimension of the shale oil reservoir is larger than the fractal dimension of typical tight oil reservoirs, indicating that the heterogeneity of shale oil reservoir is stronger. The research results have some theoretical and practical significance for the production of inter-salt shale oil reservoirs. Keywords Shale oil · Micro–nano · Pore structure · High-pressure mercury intrusion · Fractal List of symbols D Fractal dimension of shale oil core micro–nanopore volume s Intrusive mercury saturation of high-pressure mercury intrusion experiment p Pressure of high-pressure mercury intrusion, i.e., capillary pressure Pmin Capillary pressure corresponding to the maximum pore diameter Abbreviations CT Computed tomography NMR Nuclear magnetic resonance LTNA Low-temperature nitrogen adsorption HPMI High-pressure mercury injection
* Zhengming Yang [email protected] * Wei Lin [email protected] 1
Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China
2
Department of Porous Flow and Fluid Mechanics, Research Institute of Petroleum Exploration and Development, PetroChina Company Limited, Beijing 100083, China
3
School of Geosciences, Yangtze University, Wuhan 430100, China
Introduction Since 2010, some scholars have carried out large-scale research in the unconventional oil and gas field and gradually formed an unconventional oil and gas geological theory system (Zou et al. 2012b). As the shale gas revolution in North America, with the shale gas development experience and the technology of horizontal well volume fracturing, China has made gratifying progress in the field of tight oil and shale gas and has achieved breakthroughs in Ordos, Songliao, Zhungeer, Bohai Bay and Sichuan basin and other basins (Li et al. 2015). According to the hydrocarbon generation theory, shale oil reservoirs with source retention of 20–50% show great potential for oil and gas development. In t
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