Characterization of Pore Structure and Oil-Water Two-Phase Seepage Properties in Sandstone Reservoirs

IF 0.6 4区 工程技术 Q4 ENERGY & FUELS Chemistry and Technology of Fuels and Oils Pub Date : 2024-07-23 DOI:10.1007/s10553-024-01729-3
Hao Li, Wenzhao Zhang, Maojun Fang, Lichun Sun, Yuhu Bai, Hujun Gong
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Abstract

In this study, the pore structure and oil-water phase seepage characteristics of sandstone reservoirs of the Yanchang Formation in the Ordos Basin were deeply analyzed. Through scanning electron microscopy observation, oil-water phase percolation experiments and nuclear magnetic resonance (NMR) experiments on 30 core samples, the pore structure was categorized into uniform macroporous, striated, microfractured and dense types. The experimental results show that the uniform macroporous type pore structure shows the strongest seepage capacity, and its ratio of liquid-measured to gas-measured permeability is 0.724 on average, while the dense type pore structure has the weakest seepage capacity, and the ratio is 0.091 on average; NMR T2 spectral analysis reveals that the cores with different types of pore structure show significant characteristic differences in the water-driven oil drive process, especially in the substitution of oil in the macroporous and micrometer pore In particular, the oil substitution in large pores and micron pores is remarkable, that is, the oil-water seepage process and the response of seepage and suction of cores with different types of pore structure are obviously different, which is a better way to study the characteristics of oil-water seepage and distribution of oil and water; the uniform macroporous type and the striptype pore structure are more effective in oil-water two-phase seepage, and the microfracture type and the dense type are relatively poor. This paper provides a basis for the exploitation of tight reservoirs in the study area, which is of great theoretical and practical significance for optimizing the oilfield development strategy and improving the efficiency of oil and gas exploitation.

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砂岩储层孔隙结构和油水两相渗流特性的表征
本研究深入分析了鄂尔多斯盆地延长地层砂岩储层的孔隙结构和油水相渗流特征。通过对 30 个岩心样品进行扫描电镜观察、油水相渗流实验和核磁共振实验,将孔隙结构分为均匀大孔型、条纹型、微裂缝型和致密型。实验结果表明,均匀大孔型孔隙结构的渗流能力最强,其液体测量渗透率与气体测量渗透率之比平均为 0.724,而致密型孔隙结构的渗流能力最弱,其液体测量渗透率与气体测量渗透率之比平均为 0.平均为 0.091;核磁共振 T2 图谱分析表明,不同孔隙结构类型的岩心在水驱驱油过程中表现出明显的特征差异,尤其是在大孔隙和微米孔隙中油的置换方面尤为显著,即不同孔隙结构类型的岩心油水渗流过程和渗吸响应明显不同,是研究油水渗流特征和油水分布的较好方法;均匀大孔型和条带型孔隙结构对油水两相渗流效果较好,微裂缝型和致密型相对较差。本文为研究区致密油藏的开采提供了依据,对优化油田开发战略、提高油气开采效率具有重要的理论和实践意义。
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来源期刊
Chemistry and Technology of Fuels and Oils
Chemistry and Technology of Fuels and Oils 工程技术-工程:化工
CiteScore
0.90
自引率
16.70%
发文量
119
审稿时长
1.0 months
期刊介绍: Chemistry and Technology of Fuels and Oils publishes reports on improvements in the processing of petroleum and natural gas and cracking and refining techniques for the production of high-quality fuels, oils, greases, specialty fluids, additives and synthetics. The journal includes timely articles on the demulsification, desalting, and desulfurizing of crude oil; new flow plans for refineries; platforming, isomerization, catalytic reforming, and alkylation processes for obtaining aromatic hydrocarbons and high-octane gasoline; methods of producing ethylene, acetylene, benzene, acids, alcohols, esters, and other compounds from petroleum, as well as hydrogen from natural gas and liquid products.
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