页岩、砂岩岩心核磁共振实验结果对回波间隔的敏感性差异
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摘要
回波间隔的选取对核磁共振岩心分析实验结果影响很大,为确定回波间隔对不同岩样的核磁共振结果的影响程度,系统研究了页岩、砂岩岩心核磁共振岩心实验对回波间隔的敏感性。对相同状态下的页岩、砂岩岩心进行了多组回波间隔的核磁共振测量,分析了不同岩样核磁实验横向弛豫时间谱的形态、横向弛豫时间谱峰位置和核磁孔隙度与回波间隔的关系。结果表明,回波间隔对不同岩性岩心的敏感性有很大差异,砂岩岩心对回波间隔的敏感性较弱,回波间隔不同,其横向弛豫时间谱的变化在形态上有所改变,但其主体位置和核磁孔隙度变化不大;页岩岩心对回波间隔非常敏感,回波间隔不同,横向弛豫时间谱不但形态发生了明显的变化,而且其主体位置向右移动,核磁孔隙度也迅速减小。
The appropriate echo interval can be used to accurately measure the results of nuclear magnetic resonance experiments. To determine the influence of echo spacing on the nuclear magnetic resonance( NMR) results of different rock samples,the sensitivity of nuclear magnetic resonance core experiments to echo spacing is systematically studied. NMR measurements of multiple sets of echo interval values for shale and sandstone cores in the same state,and their effects on the morphology,lateral relaxation time spectral position and porosity of the lateral relaxation time spectrum of the rock samples were analyzed. The results show that the sensitivity to different lithological experimental results is very different. The sandstone core has weak sensitivity to echo interval,and the lateral relaxation time spectrum changes in morphology,but its main body position and envelope area did not change much; the shale core was very sensitive to echo interval,and the lateral relaxation time spectrum not only changed its shape,but also its body position moved to the right,and the envelope area also decreased rapidly.
The appropriate echo interval can be used to accurately measure the results of nuclear magnetic resonance experiments. To determine the influence of echo spacing on the nuclear magnetic resonance( NMR) results of different rock samples,the sensitivity of nuclear magnetic resonance core experiments to echo spacing is systematically studied. NMR measurements of multiple sets of echo interval values for shale and sandstone cores in the same state,and their effects on the morphology,lateral relaxation time spectral position and porosity of the lateral relaxation time spectrum of the rock samples were analyzed. The results show that the sensitivity to different lithological experimental results is very different. The sandstone core has weak sensitivity to echo interval,and the lateral relaxation time spectrum changes in morphology,but its main body position and envelope area did not change much; the shale core was very sensitive to echo interval,and the lateral relaxation time spectrum not only changed its shape,but also its body position moved to the right,and the envelope area also decreased rapidly.
引文
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16 Yan W C,Sun J M,Sun Y,et al.A robust NMR method to measure porosity of low porosity pocks[J].Microporous and Mesoporous Materials,2018,269:113-117
17 Aditya C,Ali T,Chandra S R,et al.NMR considerations in shales at elevated temperature[C]//SPE/AAPG/SEG Unconventional Resources Technology Conference.Houston:SPE,2018:1-11
2 Chang D,Vinegar H,Morriss C,et al.Effective porosity,producible fluid,and permeability in carbonates from NMR logging[C]//SPWLA35th Annual Logging Symposium.Oklahoma:Society of Petrophysicists and Well-Log Analysts,1994:1-21
3王为民,叶朝辉,郭和坤.陆相储层岩石核磁共振物理特征的实验研究[J].波谱学杂志,2001,18(2):113-121Wang Weimin,Ye Zhaohui,Guo Hekun.Experimental study on NMRphysical characteristics of continental reservoir rocks[J].Journal of Spectroscopy,2001,18(2):113-121
4王忠东,汪浩,李能根,等.核磁共振岩心基础实验分析[J].测井技术,2001,25(3):170-174Wang Zhongdong,Wang Hao,Li Nenggen,et al.Experimental analysis of nuclear magnetic resonance cores[J].Logging Technology,2001,25(3):170-174
5 Toumelin E,Torres-Verdín C,Of T U,et al.Modeling of multiple echo-time NMR measurements for complex pore geometries and multiphase saturations[J].SPE Reservoir Evaluation&Engineering,2003,6(4):234-243
6 Fang S,Chen S H,Tauk R,et al.Quantification of hydrocarbon saturation in carbonate formations using simultaneous inversion of multiple NMR echo trains[C]//SPE Annual Technical Conference and Exhibition.Houston:Society of Petroleum Engineers,2004:1-12
7范宜仁,倪自高,邓少贵,等.储层性质与核磁共振测量参数的实验研究[J].石油实验地质,2005,27(6):624-626Fan Yiren,Ni Zigao,Deng Shaogui,et al.Experimental study on reservoir properties and NMR measurement parameters[J].Petroleum Geology of Petrology,2005,27(6):624-626
8谢然红,肖立志,邓克俊.核磁共振测井孔隙度观测模型与处理方法研究[J].地球物理学报,2006,49(5):1567-1572Xie Ranhong,Xiao Lizhi,Deng Kejun.Research on observation model and processing method of nuclear magnetic resonance logging porosity[J].Chinese Journal of Geophysics,2006,49(5):1567-1572
9周宇,魏国齐,郭和坤.核磁共振孔隙度影响因素分析与校准[J].测井技术,2011,35(3):210-214Zhou Yu,Wei Guoqi,Guo Hekun.Analysis and calibration of factors affecting NMR porosity[J].Logging Technology,2011,35(3):210-214
10孙军昌,陈静平,杨正明,等.页岩储层岩芯核磁共振响应特征实验研究[J].科技导报,2012,30(14):25-30Sun Junchang,Chen Jingping,Yang Zhengming,et al.Experimental study on NMR response characteristics of shale reservoir cores[J].Science&Technology Review,2012,30(14):25-30
11 Xu H,Tang D Z,Zhao J L,et al.A precise measurement method for shale porosity with low-field nuclear magnetic resonance:A case study of the carboniferous-permian strata in the Linxing area,Eastern Ordos Basin,China[J].Fuel,2015,143:47-54
12 Carl S,Ali T,Chandra R,et al.NMR considerations in shale evaluation[C]//SPWLA 57th Annual Logging Symposium.Reykjavik:Society of Petrophysicists and Well-Log Analysts,2016:1-9
13高明哲,邹长春,彭诚,等.页岩储层岩心核磁共振实验参数选取方法研究[J].工程地球物理学报,2016,13(3):263-270Gao Mingzhe,Zou Changchun,Peng Cheng,et al.Study on the selection method of NMR parameters of shale reservoir cores[J].Journal of Engineering Geophysics,2016,13(3):263-270
14孙建孟,宗成林,董旭,等.基于核磁共振的页岩粉碎样品孔隙度研究[J].测井技术,2017,41(5):512-516Sun Jianmeng,Zong Chenglin,Dong Xu,et al.Porosity study of shale crushing samples based on nuclear magnetic resonance[J].Logging Technology,2017,41(5):512-516
15张涛,张希巍.页岩孔隙定性与定量方法的对比研究[J].天然气勘探与开发,2017,40(4):34-43Zhang Tao,Zhang Xiwei.Comparative study of qualitative and quantitative methods for shale pore[J].Natural Gas Exploration and Development,2017,40(4):34-43
16 Yan W C,Sun J M,Sun Y,et al.A robust NMR method to measure porosity of low porosity pocks[J].Microporous and Mesoporous Materials,2018,269:113-117
17 Aditya C,Ali T,Chandra S R,et al.NMR considerations in shales at elevated temperature[C]//SPE/AAPG/SEG Unconventional Resources Technology Conference.Houston:SPE,2018:1-11