利用分形理论研究可移动石油对不同类型页岩孔隙结构的影响:中国准噶尔盆地马湖相X井丰城层页岩实例研究

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Hong Zhang, Zhengchen Zhang, Zhenlin Wang, Yamin Wang, Rui Yang, Tao Zhu, Feifei Luo, Kouqi Liu
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引用次数: 0

摘要

本研究分析了来自准噶尔盆地马湖沙格 X 井的 19 个页岩样本,研究了可移动石油对不同类型页岩孔隙结构的影响。首先,X 射线衍射(XRD)分析对页岩样本进行了分类。随后,通过总有机碳(TOC)含量测量、Rock-Eval 热解和氮吸附实验,对石油索氏提取前后样本的地球化学性质和孔隙结构进行了比较分析。此外,分形理论定量描述了可移动石油对不同类型页岩孔隙结构的影响。结果表明,硅质页岩中的可移动石油含量高于钙质页岩。石油萃取导致所有样本的比表面积和孔隙体积显著增加,尤其是硅质页岩。钙质页岩主要表现为 H2-H3 型滞后环,表明其孔隙结构均匀,呈墨水瓶状。相反,硅质页岩则表现出多种滞回,反映出其复杂的孔隙结构。钙质页岩的分形维度主要与孔隙结构相关,与采油前后的总有机碳含量没有明显的相关性。相反,硅质页岩样本的分形维度变化与 TOC 含量或孔隙结构都没有明显的相关性,这表明 TOC 和孔隙结构都可能导致分形维度的变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Using Fractal Theory to Study the Influence of Movable Oil on the Pore Structure of Different Types of Shale: A Case Study of the Fengcheng Formation Shale in Well X of Mahu Sag, Junggar Basin, China
This study investigated the influence of movable oil on the pore structure of various shale types, analyzing 19 shale samples from Well X in the Mahu Sag of the Junggar Basin. Initially, X-ray diffraction (XRD) analysis classified the shale samples. Subsequently, the geochemical properties and pore structures of the samples, both pre and post oil Soxhlet extraction, were comparatively analyzed through Total Organic Carbon (TOC) content measurement, Rock-Eval pyrolysis, and nitrogen adsorption experiments. Additionally, fractal theory quantitatively described the impact of movable oil on the pore structure of different shale types. Results indicated higher movable oil content in siliceous shale compared to calcareous shale. Oil extraction led to a significant increase in specific surface area and pore volume in all samples, particularly in siliceous shale. Calcareous shale predominantly displays H2–H3 type hysteresis loops, indicating a uniform pore structure with ink-bottle-shaped pores. Conversely, siliceous shale exhibited diverse hysteresis loops, reflecting its complex pore structure. The fractal dimension in calcareous shale correlated primarily with pore structure, exhibiting no significant correlation with TOC content before or after oil extraction. Conversely, the fractal dimension changes in siliceous shale samples do not have a clear correlation with either TOC content or pore structure, suggesting variations may result from both TOC and pore structure.
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来源期刊
CiteScore
7.20
自引率
4.30%
发文量
567
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