Quantitative characterization of fluid occurrence in shale reservoirs

IF 9 1区 地球科学 Q1 ENERGY & FUELS Advances in Geo-Energy Research Pub Date : 2023-08-18 DOI:10.46690/ager.2023.09.02
Junqian Li, Jianchao Cai
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Abstract

: Shale oil and gas, as important unconventional resources, have been widely discussed in the last decade. The occurrence characteristics of fluids (oil, gas, and water) in shale reservoirs are closely related to the exploitation of shale oil and gas, therefore the quantitative characterization of fluid occurrence in shale reservoirs has received extensive attention. In this paper, the latest advances and potential challenges on this subject are summarized. With respect to shale oil, the amounts, ratios and micro-distributions of shale oil in different states can be determined using the state equation of liquid and adsorption ratio equation, which contributes to identifying high-quality shale oil reservoirs. However, it is still necessary to strengthen the research on the multi-attribute coupling relationship and oil-rock interaction of shale oil reservoirs, and the determination of occurrence characteristics of adsorbed and free oil under in situ reservoir conditions. In terms of shale gas evaluation, the process analysis method and isotope fractionation method effectively solve the problem of evaluating in situ gas-bearing characteristics of shale, and can accurately estimate the amounts of total, adsorbed and free gas. The quantum physisorption behavior of gas could be a new research direction to reveal the microscopic occurrence mechanism of shale gas. As for shale pore water, a complete evaluation procedure for determining the amounts and micro-distributions of adsorbed and free water in shale matrix pores has been established, which provides insight into the storage and flow of oil and gas. In future work, a study on the quantitative evaluation of water-rock interaction is significant for obtaining the adsorbed and free water under in situ reservoir conditions
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页岩油气藏流体产状的定量表征
:页岩油气作为重要的非常规资源,在过去十年中得到了广泛的讨论。页岩油气藏流体(油、气、水)的产状特征与页岩油气的开发密切相关,因此页岩油气储层流体产状的定量表征受到了广泛关注。本文综述了该领域的最新进展和潜在挑战。对于页岩油,可以使用液体状态方程和吸附比方程来确定不同状态下页岩油的数量、比例和微观分布,这有助于识别优质页岩油储层。然而,仍有必要加强对页岩油藏多属性耦合关系和油岩相互作用的研究,以及在原位储层条件下确定吸附油和游离油的赋存特征。在页岩气评价方面,过程分析法和同位素分馏法有效地解决了评价页岩原位含气特征的问题,可以准确地估计总气、吸附气和游离气的含量。天然气的量子物理吸附行为可能是揭示页岩气微观赋存机制的一个新的研究方向。对于页岩孔隙水,已经建立了一个完整的评估程序,用于确定页岩基质孔隙中吸附水和游离水的数量和微观分布,从而深入了解油气的储存和流动。在未来的工作中,对水-岩相互作用的定量评价研究对于获得原位储层条件下的吸附水和游离水具有重要意义
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来源期刊
Advances in Geo-Energy Research
Advances in Geo-Energy Research natural geo-energy (oil, gas, coal geothermal, and gas hydrate)-Geotechnical Engineering and Engineering Geology
CiteScore
12.30
自引率
8.50%
发文量
63
审稿时长
2~3 weeks
期刊介绍: Advances in Geo-Energy Research is an interdisciplinary and international periodical committed to fostering interaction and multidisciplinary collaboration among scientific communities worldwide, spanning both industry and academia. Our journal serves as a platform for researchers actively engaged in the diverse fields of geo-energy systems, providing an academic medium for the exchange of knowledge and ideas. Join us in advancing the frontiers of geo-energy research through collaboration and shared expertise.
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