页岩润湿性:用综合吸吸成像技术和一种新的假设理论解开难以捉摸的性质

IF 2.1 4区 工程技术 Q3 ENERGY & FUELS
S. Peng, P. Shevchenko, L. Ko
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引用次数: 1

摘要

润湿性在页岩储层评价和动力学中的重要性日益受到重视。在非常规油藏提高采收率(EOR)的策略制定中,润湿性也是一个关键考虑因素。然而,页岩润湿性的测定通常是难以捉摸的,对其的理解仍然不完整。一些常用的评估页岩润湿性的假设和方法被认为是不准确或有问题的。在这项工作中,对页岩润湿性及其测量和评价方法进行了重要的澄清。采用综合渗吸和成像方法对Eagle Ford和Wolfcamp页岩地层的6个页岩样品进行了润湿性研究。根据自发吸胀的水驱油结果和样品中的主要孔隙类型来评估润湿性。样品的润湿性从强水湿性(SW)到油湿性不等,随着热成熟度的增加(Ro值从~0.45 ~ 1.4%),样品的水湿性逐渐减弱(或油湿性逐渐增强)。在此基础上,提出了页岩从原始水湿状态向润湿性转变的新假设。这一新假设强调在油水驱替和油老化历史的动态背景下评价页岩润湿性,页岩润湿性是整个地质时间框架内油水岩相互作用的结果。热成熟度提高引起的油的流动性增强是油吸胀的主要驱动因素,而孔隙类型和孔径对油水驱油和润湿性转化也起着重要作用。页岩孔隙系统润湿性转化的难易程度依次为方解石>石英、白云石>粘土。不同矿物混合边界的孔隙介于两者之间。其他地质因素(如总有机碳(TOC)和孔隙压力)也会影响原油的吸油性,从而影响润湿性。讨论了页岩润湿性对含水饱和度、含油饱和度以及提高采收率的重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Shale Wettability: Untangling the Elusive Property with an Integrated Imbibition and Imaging Technique and a New Hypothetical Theory
The importance of wettability in reservoir evaluation and dynamics in shale is gaining increasing attention. Wettability is also a key consideration in the strategy development of enhanced oil recovery (EOR) in unconventional reservoirs. However, the determination of shale wettability is often elusive, and an understanding still remains incomplete. Several commonly applied assumptions and methods for evaluating shale wettability are considered inaccurate or problematic. In this work, important clarifications about shale wettability and the methods of measurement or evaluation are made. Wettability is studied for six shale samples from Eagle Ford and Wolfcamp Shale formations with increasing thermal maturity using an integrated imbibition and imaging method. Wettability was evaluated based on the results of water-oil displacement via spontaneous imbibition and the dominant pore type in the sample. Wettability of the samples is ranged from strong water-wet (SW) to oil-wet and has a general trend of becoming less water-wet (or more oil-wet) with increasing thermal maturity (Ro value from ~0.45 to 1.4%). A new hypothesis on shale wettability transformation from the original water-wet status is proposed based on the results. This new hypothesis emphasizes the evaluation of shale wettability under a dynamic context of oil-water displacement and oil aging history, and shale wettability is a result of oil-water-rock interaction through the geological time frame. Enhanced oil mobility caused by increasing thermal maturity is the main drive of oil imbibition, whereas pore type and pore size also play an important role in oil-water displacement and consequently wettability transformation. The ease of wettability transformation of the pore system in shale is in the order of calcite > quartz, dolomite >> clay. Pores with mixed boundaries of different minerals fall in between. Other geological factors [e.g., total organic carbon (TOC) and pore pressure] also affect oil imbibition and thus wettability. Important implications of shale wettability on water and oil saturation and on improved oil recovery are also discussed.
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来源期刊
CiteScore
5.30
自引率
0.00%
发文量
68
审稿时长
12 months
期刊介绍: Covers the application of a wide range of topics, including reservoir characterization, geology and geophysics, core analysis, well logging, well testing, reservoir management, enhanced oil recovery, fluid mechanics, performance prediction, reservoir simulation, digital energy, uncertainty/risk assessment, information management, resource and reserve evaluation, portfolio/asset management, project valuation, and petroleum economics.
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