基于T_2截止值的幂函数构建毛管压力曲线
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摘要
岩心核磁共振(NMR)T_2谱和毛管压力曲线都在一定程度上反映了岩石孔隙结构,理论分析表明可利用T_2谱构建毛管压力曲线,由此快速获取储层孔隙结构的信息.本文对18块岩样T_2分布和毛管压力曲线进行了分析,提出将T_2截止值作为幂函数的分段点,采用分段幂函数方法构建岩样的NMR毛管压力曲线,并与采用不分段幂函数方法获得的毛管压力曲线进行了对比.研究结果表明,与不分段幂函数方法相比,分段幂函数方法得到的结果和压汞实验测定的毛管压力曲线吻合度更高,平均拟合度(R2)达到0.9431,并且论证了T_2截止值作为分段点进行分段幂函数法构建NMR毛管压力曲线的合理性和可靠性.T_2截止值的引入提高了幂函数法构建NMR毛管压力曲线的精度,是利用NMR T_2谱构建岩样毛管压力曲线的有价值探索.
To some extent, pore throat structures of the rock can be characterized by NMR T_2 distribution and capillary pressure curve. Theoretical analysis showed that NMR T_2 distribution of a rock could potentially be used to derive its capillary pressure curve, providing a quick and non-destructive way to obtain the pore structure distribution data of the reservoir. In this study, the capillary pressure curves of typical cores were constructed from nuclear magnetic resonance(NMR) T_2 distributions using a piecewise power function method. T_2 cutoff values were introduced as piecewise points for the power function. Then the capillary pressure curves constructed with the piecewise power function method and those constructed with the non-piecewise power function method were compared. The results showed that the proposed method had improved precision, with an averaged fitting degree of 0.943 1. Introducing of T_2 cutoff values was proven to be useful in constructing NMR capillary curves by the piecewise power function method.
To some extent, pore throat structures of the rock can be characterized by NMR T_2 distribution and capillary pressure curve. Theoretical analysis showed that NMR T_2 distribution of a rock could potentially be used to derive its capillary pressure curve, providing a quick and non-destructive way to obtain the pore structure distribution data of the reservoir. In this study, the capillary pressure curves of typical cores were constructed from nuclear magnetic resonance(NMR) T_2 distributions using a piecewise power function method. T_2 cutoff values were introduced as piecewise points for the power function. Then the capillary pressure curves constructed with the piecewise power function method and those constructed with the non-piecewise power function method were compared. The results showed that the proposed method had improved precision, with an averaged fitting degree of 0.943 1. Introducing of T_2 cutoff values was proven to be useful in constructing NMR capillary curves by the piecewise power function method.
引文
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[18]GE X M,FAN Y R,ZHU X J,et al.Determination of nuclear magnetic resonance T2 cutoff value based on multifractal theory-An application in sandstone with complex pore structure[J].Geophysics,2015,80(1):D11-D21.
[19]XIAO L,LI J R,MAO Z Q,et al.A method to determine nuclear magnetic resonance(NMR)T2 cutoff based on normal distribution simulation in tight sandstone reservoirs[J].Fuel,2018,225:472-482.
[20]LI M,WANG H,CHEN M.Distribution characteristics and influencing factors of movable fluid in tight sandstone reservoirs:a case study of Lucaogou Formation in Jimsar Sag,NW China[J].Lithologic Reservoirs,2018,30(1):140-149.李闽,王浩,陈猛.致密砂岩储层可动流体分布及影响因素研究--以吉木萨尔凹陷芦草沟组为例[J].岩性油气藏,2018,30(1):140-149.
[2]LI H B,ZHU J Y,GUO H S.Methods for calculating pore radius distribution in rock from NMR T2 spectra[J].Chinese J Magn Reson,2008,25(2):273-280.李海波,朱巨义,郭和坤.核磁共振T2谱换算孔隙半径分布方法研究[J].波谱学杂志,2008,25(2):273-280.
[3]WANG S.Analysis of pore structure characteristics of rock by nuclear magnetic resonance[J].Xinjiang Petroleum Geology,2009,30(6):768-770.王胜.用核磁共振分析岩石孔隙结构特征[J].新疆石油地质,2009,30(6):768-770.
[4]XIAO L,CHEN Z M,YUAN Y C.A novel method to construct capillary pressure curves by using NMR log data and its application in reservoir evaluation[C].International Petroleum Technology Conference,2008.
[5]LI A F,REN X X,WANG G J,et al.Characterization of pore structure of low permeability reservoirs using a nuclear magnetic resonance method[J].Journal of China University of Petroleum,2015,39(6):92-98.李爱芬,任晓霞,王桂娟,等.核磁共振研究致密砂岩孔隙结构的方法及应用[J].中国石油大学学报(自然科学版),2015,39(6):92-98.
[6]HE Y D,MAO Z Q,XIAO L Z,et al.A new method to obtain capillary pressure curve using NMR T2 distribution[J].Journal of Jilin University(Geoscience),2005,35(2):177-181.何雨丹,毛志强,肖立志,等.利用核磁共振T2分布构造毛管压力曲线的新方法[J].吉林大学学报(地球科学版),2005,35(2):177-181.
[7]YAN J P,WEN D N,LI Z Z,et al.The quantitative evaluation method of low permeable sandstone pore structure based on nuclear magnetic resonance(NMR)logging[J].Chinese Journal of Geophysics,2016,59(4):1543-1552.闫建平,温丹妮,李尊芝,等.基于核磁共振测井的低渗透砂岩孔隙结构定量评价方法-以东营凹陷南斜坡沙四段为例[J].地球物理学报,2016,59(4):1543-1552.
[8]GEORGE C,XIAO L Z,MANFRED P.Principle and application of NMR logging[M].Beijing:Petroleum Industry Press,2007.
[9]ZHOU S W,XUE H Q,GUO W,et al.Measuring movable oil saturation in reservoirs with low-field NMR technology[J].Chinese J Magn Reson,2015,32(3):489-498.周尚文,薛华庆,郭伟,等.基于低场核磁共振技术的储层可动油饱和度测试新方法[J].波谱学杂志,2015,32(3):489-498.
[10]匡立春,孙中春,毛志强,等.核磁共振测井技术在准噶尔盆地油气勘探开发中的应用[M].北京:石油工业出版社,2015.
[11]ZHAO W Z,DING Y J,XIAO F,et al.On the method of determing the T2 cutoff value with the T2 spectrum characteristics[J].Well Logging Technology,2009,33(5):430-435.邵维志,丁娱娇,肖斐,等.利用T2谱形态确定T2截止值的方法探索[J].测井技术,2009,33(5):430-435.
[12]WANG Z Z,DENG M Y,ZHAI S D,et al.Factors affecting NMR T2 spectra of oil well samples and methods for determining the T2 cutoff value[J].Chinese J Magn Reson,2006,23(1):143-151.王志战,邓美寅,翟慎德,等.油井样品NMR T2谱的影响因素及T2截止值的确定方法[J].波谱学杂志,2006,23(1):143-151.
[13]ZHANG Y,LUO C.Study on the method for determining T2 cutoff value in NMR logging[J].Standards and Quality of China Petroleum and Chemical,2012,33(14):249.张烨,罗程.核磁共振测井T2截止值的确定方法研究[J].中国石油和化工标准与质量,2012,33(14):249.
[14]ZHOU S W,LIU H L,YAN G,et al.NMR research of movable fluid and T2 cutoff value of marine shale in South China[J].Oil and Gas Geology,2016,37(4):612-616.周尚文,刘洪林,闫刚,等.中国南方海相页岩储层可动流体及T2截止值核磁共振研究[J].石油与天然气地质,2016,37(4):612-616.
[15]WU F,SIMA L Q,YANG H M,et al.Research on NMR T2 cutoff of complex lithology in the West Qaidam Basin[J].Well Logging Technology,2014,38(2):144-149.吴丰,司马立强,杨洪明,等.柴西地区复杂岩性核磁共振T2截止值研究[J].测井技术,2014,38(2):144-149.
[16]QU X Y.Determination of T2 cutoff value of NMR logging in Bin Chang block[J].Henan science and technology,2015,3:129-130.曲星远.彬长区块核磁共振录井T2截止值确定方法[J].河南科技,2015,3:129-130.
[17]YAN Z W,ZHANG H L,ZHOU X F,et al.A study on T2 cutoff value of ultralow permeability sandstone NMR in southwestern Ordos Basin,Minister 8[J].Petroleum Geology and Engineering,2015,29(5):128-131.闫子旺,张红玲,周晓峰,等.鄂尔多斯盆地西南部长8超低渗透砂岩核磁共振T2截止值研究[J].石油地质与工程,2015,29(5):128-131.
[18]GE X M,FAN Y R,ZHU X J,et al.Determination of nuclear magnetic resonance T2 cutoff value based on multifractal theory-An application in sandstone with complex pore structure[J].Geophysics,2015,80(1):D11-D21.
[19]XIAO L,LI J R,MAO Z Q,et al.A method to determine nuclear magnetic resonance(NMR)T2 cutoff based on normal distribution simulation in tight sandstone reservoirs[J].Fuel,2018,225:472-482.
[20]LI M,WANG H,CHEN M.Distribution characteristics and influencing factors of movable fluid in tight sandstone reservoirs:a case study of Lucaogou Formation in Jimsar Sag,NW China[J].Lithologic Reservoirs,2018,30(1):140-149.李闽,王浩,陈猛.致密砂岩储层可动流体分布及影响因素研究--以吉木萨尔凹陷芦草沟组为例[J].岩性油气藏,2018,30(1):140-149.
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