Micro–Nano 3D CT Scanning to Assess the Impact of Microparameters of Volcanic Reservoirs on Gas Migration

IF 2.8 4区 工程技术 Q2 ENGINEERING, CHEMICAL
Processes Pub Date : 2024-09-17 DOI:10.3390/pr12092000
Xiangwei Gao, Yunliang Yu, Zhongjie Xu, Yingchun Liu
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Abstract

Volcanic rock reservoirs for oil and gas are known worldwide for their considerable heterogeneity. Micropores and fractures play vital roles in the storage and transportation of natural gas. Samples from volcanic reservoirs in Songliao Basin, CS1 and W21, belonging to the Changling fault depression and the Wangfu fault depression, respectively, have similar lithology. This study employs micro–nano CT scanning technology to systematically identify the key parameters and transport capacities of natural gas within volcanic reservoirs. Using Avizo 2020.1software, a 3D digital representation of rock core was reconstructed to model pore distribution, connectivity, pore–throat networks, and fractures. These models are then analyzed to evaluate pore/throat structures and fractures alongside microscopic parameters. The relationship between micropore–throat structure parameters and permeability was investigated by microscale gas flow simulations and Pearson correlation analyses. The results showed that the CS1 sample significantly exceeded the W21 sample in terms of pore connectivity and permeability, with connected pore volume, throat count, and specific surface area being more than double that of the W21 sample. Pore–throat parameters are decisive for natural gas storage and transport. Additionally, based on seepage simulation and the pore–throat model, the specific influence of pore–throat structure parameters on permeability in volcanic reservoirs was quantified. In areas with well–developed fractures, gas seepage pathways mainly follow fractures, significantly improving gas flow efficiency. In areas with fewer fractures, throat radius has the most significant impact on permeability, followed by pore radius and throat length.
通过微纳三维 CT 扫描评估火山储层微参数对天然气迁移的影响
火山岩油气储层因其巨大的异质性而闻名于世。微孔和裂缝在天然气的储存和运输过程中起着至关重要的作用。松辽盆地火山岩储层样品 CS1 和 W21 分别属于长岭断陷和王府断陷,具有相似的岩性。本研究采用微纳 CT 扫描技术,系统地确定了火山岩储层中天然气的关键参数和运移能力。利用 Avizo 2020.1 软件,重建了岩心的三维数字图像,以建立孔隙分布、连通性、孔喉网络和裂缝模型。然后对这些模型进行分析,以评估孔隙/咽喉结构和裂缝以及微观参数。通过微尺度气体流动模拟和皮尔逊相关分析,研究了微孔-咽喉结构参数与渗透率之间的关系。结果表明,CS1 样品在孔隙连通性和渗透性方面明显超过 W21 样品,其连通孔隙体积、喉管数量和比表面积是 W21 样品的两倍多。孔喉参数对天然气的储存和运输具有决定性作用。此外,根据渗流模拟和孔喉模型,量化了孔喉结构参数对火山岩储层渗透率的具体影响。在裂缝发达的地区,气体渗流路径主要沿着裂缝,大大提高了气体流动效率。在裂缝较少的地区,孔喉半径对渗透率的影响最大,其次是孔隙半径和孔喉长度。
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来源期刊
Processes
Processes Chemical Engineering-Bioengineering
CiteScore
5.10
自引率
11.40%
发文量
2239
审稿时长
14.11 days
期刊介绍: Processes (ISSN 2227-9717) provides an advanced forum for process related research in chemistry, biology and allied engineering fields. The journal publishes regular research papers, communications, letters, short notes and reviews. Our aim is to encourage researchers to publish their experimental, theoretical and computational results in as much detail as necessary. There is no restriction on paper length or number of figures and tables.
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