东北石油大学学报2025，Vol.49Issue(6)：112-122,11.DOI:10.3969/j.issn.2095-4107.2025.06.009
基于核磁共振实验的致密砂砾岩储层孔隙分析
Pore study of tight conglomerate reservoir based on nuclear magnetic resonance experiment:a case of the Permian Upper Wuerhe Formation in the Dongdaohaizi Sag,Junggar Basin
摘要
Abstract
Deep-ultra deep and extra-ultra low porosity and permeability conglomerate reservoir is devel-oped in the Permian Upper Wuerhe Formation in the Dongdaohaizi Sag,Junggar Basin.Combined with high-pressure Hg injection,different lithology samples were conducted in nuclear magnetic resonance(NMR)experiment in this paper.Response characteristics of saturated and centrifuged NMR T2 spectra were analyzed.Conversion models between NMR T2 spectra and high-pressure Hg injection pore radius were established.Pore quantitative parametric features of tight conglomerate reservoir were discussed.The research results show that saturated NMR T2 spectra of very coarse sandstones,sandy granules,and fine-medium pebbles are obvious bimodal,unobvious bimodal,and bimodal distributions respective-ly in the study area.The NMR relaxation time at peaks and T2 cutoff values of very coarse sandstones are major,sandy granules are second,and that of fine-medium pebbles are minor.Porosities of very coarse sandstones are large with fracture porosity.Conversely,porosities and fracture porosities are not developed in fine-medium pebbles.From very coarse sandstones to fine-medium pebbles,lower limit of mobile pore radius and mobile porosities decrease generally.The lower limit of effective porosity for tight conglomerate reservoir is about 4.81％ in Upper Wuerhe Formation of the Dongdaohaizi Sag.The corresponding lower limit of mobile porosity is about 0.80％.The lower limit of effective porosity and forecasting method of mobile porosity would be contributed to the evaluation of favorable tight conglom-erate reservoir in the Upper Wuerhe Formation of the Dongdaohaizi Sag.关键词
准噶尔盆地/东道海子凹陷/二叠系/上乌尔禾组/核磁共振/致密砂砾岩储层/孔隙参数Key words
Junggar Basin/Dongdaohaizi Sag/Permian/Upper Wuerhe Formation/nuclear magnetic resonance/tight conglomerate reservoir/pore parameter分类
能源科技引用本文复制引用
李辉,袁瑞,王秋玉,谢知益,张蓉,陈梦娜,袁云峰,肖娜..基于核磁共振实验的致密砂砾岩储层孔隙分析[J].东北石油大学学报,2025,49(6):112-122,11.基金项目
中国石油天然气集团有限公司重大科技专项(2023ZZ24YJ01) （2023ZZ24YJ01）
