高孔隙度低渗透率碳酸盐岩储层岩心核磁共振实验研究
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摘要
中东地区X油田为裂缝-孔隙型碳酸盐岩油藏,其储层具有高孔隙度、低基质渗透率、孔隙结构复杂、非均质性强等特点。对研究区13块岩心样品进行核磁共振实验研究,结果表明,研究区核磁共振T_2谱特征表现为单峰(单峰左偏和单峰右偏)和左锋占优的双峰3种类型,核磁共振孔隙度与常规氦气孔隙度较为一致,T_2几何均值与储层渗透率呈正相关。分析13块岩样在不同离心力下的变化情况,250psi*离心力为该区最佳离心力,通过标定得到该区高孔隙度低渗透率碳酸盐岩岩样T_2截止值为19.15ms,远小于常规碳酸盐岩储层岩心T_2截止值理论值(86ms)。对比分析洗油前后常规物性、核磁共振谱型差异,明确了X油田有利储层核磁共振T_2谱特征。
The X oilfield in the Middle East is a fracture-pore carbonate reservoir with high porosity,low permeability,complex pore structure and strong heterogeneity.The NMR experiments of 13 core samples in the study area showed that the core NMR T_2 spectrum characteristics of the study area mainly showed there are three types of peak distribution patterns for NMR T_2 spectrum,including unimodal distribution(the peak leaning leftward or rightward),himodal distribution(dominated either by left peak);NMR porosity is consistent with conventional helium porosity;T_2 geometric mean is positively correlated with reservoir permeability.In addition,the variation of 13 rock samples under different centrifugal forces were analyzed.The centrifugal force of 250 psi is the best centrifugal force in this area.Based on the experiment,the T_2 cutoff of the rock sample in this area was determined as 19.15 ms,which is much less than the theoretical value of conventional carbonate reservoir(86 ms).Finally,by comparing the differences in conventional physical properties and NMR patterns before and after washing oil,the NMR T_2 spectral characteristics of high-quality reservoirs in X oilfield are clarified.
The X oilfield in the Middle East is a fracture-pore carbonate reservoir with high porosity,low permeability,complex pore structure and strong heterogeneity.The NMR experiments of 13 core samples in the study area showed that the core NMR T_2 spectrum characteristics of the study area mainly showed there are three types of peak distribution patterns for NMR T_2 spectrum,including unimodal distribution(the peak leaning leftward or rightward),himodal distribution(dominated either by left peak);NMR porosity is consistent with conventional helium porosity;T_2 geometric mean is positively correlated with reservoir permeability.In addition,the variation of 13 rock samples under different centrifugal forces were analyzed.The centrifugal force of 250 psi is the best centrifugal force in this area.Based on the experiment,the T_2 cutoff of the rock sample in this area was determined as 19.15 ms,which is much less than the theoretical value of conventional carbonate reservoir(86 ms).Finally,by comparing the differences in conventional physical properties and NMR patterns before and after washing oil,the NMR T_2 spectral characteristics of high-quality reservoirs in X oilfield are clarified.
引文
[1]王为民.核磁共振岩石物理研究及其在石油工业中的应用[D].武汉:中国科学院研究生院(武汉物理与数学研究所),2001.
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[5]朱怡翔,田昌炳,于兴河,等.鄂尔多斯盆地苏里格气田相对高渗砂体的成因及其岩石物理测井识别方法[J].石油实验地质,2004,26(4):389-393.
[6] COATES G R,XIAO L Z,PRAMMER M G.NMR logging principles and applications[M].Texas:Gulf Publishing Companv,1999:45-90.
[7]赵辉司,马立强,颜其彬,等.碳酸盐岩岩样核磁共振实验特征分析[J].测井技术,2011,35(2):117-121.
[8]王翼,君崔刚,唐洪明,等.碳酸盐岩核磁共振实验研究现状[J].断块油气田,2016,23(6):818-824.
[9]颜其彬,赵辉司,马立强,等.碳酸盐岩核磁共振实验与认识[J].天然气工业,2010,30(1):137-138.
[10]LYNE A,VARINI G,GHILARDOTTI G.Determination of petrophysical properties of carbonate rocks by NMR relaxometry[C]∥SPE36852,1996.
[11]AGUT R,LEVALLOIS B.Integrating core measuranents and NMR logs in complex lithology[C]∥SPE63211,2000.
[12]吴国铭,李熙喆,何宇锋,等.碳酸盐岩储层岩心T2谱分形特征探究——以安岳气田为例[J].科学技术与工程,2015,15(14):55-59.
[13]郎东江,尚根华,吕成远,等.碳酸盐岩储层核磁共振分析方法的实验及应用——以塔河油田为例[J].石油与天然气地质,2009,30(3):363-369.
[14]吴丰,戴诗华,赵辉.核磁共振测井资料在磨溪气田碳酸盐岩储层有效性评价中的应用[J].测井技术,2009,33(3):249-252.
[15]陈国军.核磁共振测井在致密油孔隙结构及储层综合评价中的应用[J].测井技术,2015,39(1):57-61.
[16]赵文杰.利用核磁共振测井资料计算平均孔喉半径[J].油气地质与采收率,2009,16(2):43-45.
[17]周尚文,薛华庆,郭伟,等.川南龙马溪组页岩核磁渗透率新模型研究[J].中国石油大学学报(自然科学版),2016,40(1):56-61.
*非法定计量单位,1psi=6894.76Pa,下同
[2] WANG X W,XIAO L Z,XIE R H,et al.Study of NMR porodity for terrestrial formation in China[J].Science in China Series G(Physics Mechanics and Astronomy),2006,49(3):313-320.
[3]王为民,孙佃庆,苗盛.核磁共振测井基础实验研究[J].测井技术,1997,21(6):385-391.
[4]赵师庆,王飞宇,等.变质煤中镜质组有机地球化学研究——核磁共振特征[J].石油实验地质,1992,14(2):116-124.
[5]朱怡翔,田昌炳,于兴河,等.鄂尔多斯盆地苏里格气田相对高渗砂体的成因及其岩石物理测井识别方法[J].石油实验地质,2004,26(4):389-393.
[6] COATES G R,XIAO L Z,PRAMMER M G.NMR logging principles and applications[M].Texas:Gulf Publishing Companv,1999:45-90.
[7]赵辉司,马立强,颜其彬,等.碳酸盐岩岩样核磁共振实验特征分析[J].测井技术,2011,35(2):117-121.
[8]王翼,君崔刚,唐洪明,等.碳酸盐岩核磁共振实验研究现状[J].断块油气田,2016,23(6):818-824.
[9]颜其彬,赵辉司,马立强,等.碳酸盐岩核磁共振实验与认识[J].天然气工业,2010,30(1):137-138.
[10]LYNE A,VARINI G,GHILARDOTTI G.Determination of petrophysical properties of carbonate rocks by NMR relaxometry[C]∥SPE36852,1996.
[11]AGUT R,LEVALLOIS B.Integrating core measuranents and NMR logs in complex lithology[C]∥SPE63211,2000.
[12]吴国铭,李熙喆,何宇锋,等.碳酸盐岩储层岩心T2谱分形特征探究——以安岳气田为例[J].科学技术与工程,2015,15(14):55-59.
[13]郎东江,尚根华,吕成远,等.碳酸盐岩储层核磁共振分析方法的实验及应用——以塔河油田为例[J].石油与天然气地质,2009,30(3):363-369.
[14]吴丰,戴诗华,赵辉.核磁共振测井资料在磨溪气田碳酸盐岩储层有效性评价中的应用[J].测井技术,2009,33(3):249-252.
[15]陈国军.核磁共振测井在致密油孔隙结构及储层综合评价中的应用[J].测井技术,2015,39(1):57-61.
[16]赵文杰.利用核磁共振测井资料计算平均孔喉半径[J].油气地质与采收率,2009,16(2):43-45.
[17]周尚文,薛华庆,郭伟,等.川南龙马溪组页岩核磁渗透率新模型研究[J].中国石油大学学报(自然科学版),2016,40(1):56-61.
*非法定计量单位,1psi=6894.76Pa,下同