EXPLORING THE WETTABILITY CHARACTERISTICS OF ARGILLACEOUS SILTSTONE WITH IMBIBITION AND NMR TECHNIQUE FOR MARINE RESERVOIR EXPLOITATION

IF 2.5 4区 工程技术 Q2 ENGINEERING, MECHANICAL Journal of Porous Media Pub Date : 2024-01-01 DOI:10.1615/jpormedia.2024052188
Liu Yang, Zhengyan Zhang, Huijin Xu, Jingwei Gao
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Abstract

The argillaceous siltstone reservoirs in South China Sea involves a wide variety of fossil resources, such as gas hydrate, marine oil, natural gas, and other mineral resources. The argillaceous siltstone with mixed wettability characteristics is easily dispersed in water, and it is difficult to study the wettability of argillaceous siltstone based on water imbibition technique. In this work, an innovative method is proposed to demonstrate the mixed wettability based on imbibition and nuclear magnetic resonance (NMR) technique. The contact angle results show that the affinity of argillaceous siltstone for oil is stronger than that for water. However, the imbibition volume of water is much larger than that of oil. The oil imbibition curve is linear, while water imbibition curve has a two-stage feature. This difference can be explained by the expansion of clay, where more water wet surfaces are exposed to the liquid, leading to changes in wettability. In addition, the coexistence of organic matter and inorganic clay minerals results in a mixed wetting characteristic. Based on NMR technology, a micro wettability index is proposed to quantitatively characterize the micro wettability heterogeneity. The micro water (or oil) wettability index of micropores (0.01−10 ms) is approximately equal to 0.5, indicating the mixed wettability. The micro water wettability index of mesopores (10−500 ms) is approximately equal to 1.0, indicating strong water wettability. These pores or cracks may be induced by clay minerals expansion. The micro oil wettability index of macropores (> 500 ms) is approximately equal to 1.0, indicating strong oil wettability, which is resulted from significant accumulation of organic debris enrichment. It is of great significance to improve the exploration and exploitation efficiency of mineral resources in the South China Sea.
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利用浸润和核磁共振技术探索砾质粉砂岩的润湿性特征,以开发海洋储层
南海弧质粉砂岩储层涉及多种化石资源,如天然气水合物、海洋石油、天然气和其他矿产资源。具有混合润湿特性的箭质粉砂岩易分散于水中,基于水浸润技术的箭质粉砂岩润湿性研究难度较大。本研究提出了一种基于浸润和核磁共振(NMR)技术的创新方法来证明混合润湿性。接触角结果表明,霰质粉砂岩对油的亲和力强于对水的亲和力。油的浸润曲线是线性的,而水的浸润曲线具有两阶段特征。造成这种差异的原因是粘土膨胀,更多的水湿表面暴露在液体中,导致润湿性发生变化。此外,有机物和无机粘土矿物的共存导致了混合润湿特性。基于核磁共振技术,提出了一种微观润湿性指数来定量表征微观润湿性的异质性。微孔(0.01-10 ms)的微水(或油)润湿指数约等于 0.5,表明具有混合润湿性。中孔(10-500 毫微米)的微水润湿指数约等于 1.0,表示强水润湿性。这些孔隙或裂缝可能是由粘土矿物膨胀引起的。大孔隙(> 500 ms)的微油润湿指数约等于 1.0,表明油润湿性很强,这是有机碎屑大量富集造成的。这对提高南海矿产资源的勘探开发效率具有重要意义。
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来源期刊
Journal of Porous Media
Journal of Porous Media 工程技术-工程:机械
CiteScore
3.50
自引率
8.70%
发文量
89
审稿时长
12.5 months
期刊介绍: The Journal of Porous Media publishes original full-length research articles (and technical notes) in a wide variety of areas related to porous media studies, such as mathematical modeling, numerical and experimental techniques, industrial and environmental heat and mass transfer, conduction, convection, radiation, particle transport and capillary effects, reactive flows, deformable porous media, biomedical applications, and mechanics of the porous substrate. Emphasis will be given to manuscripts that present novel findings pertinent to these areas. The journal will also consider publication of state-of-the-art reviews. Manuscripts applying known methods to previously solved problems or providing results in the absence of scientific motivation or application will not be accepted. Submitted articles should contribute to the understanding of specific scientific problems or to solution techniques that are useful in applications. Papers that link theory with computational practice to provide insight into the processes are welcome.
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