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Study of NMR porosity for terrestrial formation in China

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Science China(Physics,Mechanics & Astronomy) 2006年第3期49卷 313-320页

作者： WANG Xiaowen XIAO Lizhi xie ranhong ZHANG Yuanzhong Faculty of Natural Resource and Information Technology China University of Petroleum Beijing 102249 China Faculty of Natural Resource and Information Technology China University of Petroleum Beijing 102249 China Faculty of Natural Resource and Information Technology China University of Petroleum Beijing 102249 China Faculty of Natural Resource and Information Technology China University of Petroleum Beijing 102249 China

NMR logging is an effective method for porosity measurement. NMR-derived porosity only comes from the pore fluid and is, in principle, not affected by rock matrix. However, it is found that the difference between NMR-derived and conventional log-derived porosities is often between 2 to 6 pu, which is unacceptable, in terrestrial formation in China. In the paper, the theory of NMR porosity was reviewed. The influence factors on NMR porosity error were analyzed based on NMR core measurements. More than 30 core samples with a wide range of porosities including sandstone, limestone and artificial ceramic were chosen for the conventional and NMR porosity measurements. The current NMR data acquisition method was studied based on laboratory NMR core meas- urements and found to be not good for terrestrial formation. A new NMR data acquisition method suiting for terrestrial formation in China was proposed and much improved the accuracy of NMR porosity measurement. It is suggested that the analysis of core samples from different regions should be carried out before logging in order to obtain accurate NMR porosity.

关键词： NMR logging,terrestrial formation,porosity

(T_2,T_1/T_2) Two-Dimensional NMR Method for Gas Layers Typing

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测井技术 2010年第2期34卷 115-119页

作者： xie ranhong XIAO Lizhi State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China Key Laboratory of Earth Prospecting and Information Technology China University of Petroleum Beijing 102249 China

The gas saturation in flushed zone of gas layers is low and the observed gas signal is weak because the mud filtrate invasion reduces the native gas saturation.A(T2,T1/T2) two-dimensional nuclear magnetic resonance(NMR) method of typing gas layers was *** performance of(T2,T1/T2) method for typing gas at different kinds of reservoirs,signal-to-noise ratios and gas saturations was studied in details through numerical *** results show that(T2,T1/T2) method is especially useful for identifying gas *** is suitable for typing lower gas saturation formation where drilling mud filtrate flushes strongly.

关键词： NMR法天然气测井技术钻井工艺

Advanced fluid-typing methods for NMR logging

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Petroleum Science 2011年第2期8卷 163-169页

作者： xie ranhong Xiao Lizhi State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China Key Laboratory of Earth Prospecting and Information Technology China University of Petroleum Beijing 102249 China

In recent years, nuclear magnetic resonance （NMR） has been increasingly used for fluid- typing in well-logging because of the improved generations of NMR logging tools. This paper first discusses the applicable conditions of two one-dimensional NMR methods： the dual TW method and dual TE method. Then, the two-dimensional （T2, D） and （T2, T1） NMR methods are introduced. These different typing methods for hydrocarbon are compared and analyzed by numerical simulation. The results show that the dual TW method is not suitable for identifying a macroporous water layer. The dual TE method is not suitable for typing gas and irreducible water. （T2, T1） method is more effective in typing a gas layer. In an oil-bearing layer of movable water containing big pores, （T2, T1） method can solve the misinterpretation problem in the dual TWmethod between a water layer with big pores and an oil layer. The （T2, T1） method can distinguish irreducible water from oil of a medium viscosity, and the viscosity range of oil becomes wide in contrast with that of the dual TW method. The （T2, D） method is more effective in typing oil and water layers. In a gas layer, when the SNR is higher than a threshold, the （T2, D） method can resolve the overlapping T2 signals of irreducible water and gas that occurs due to the use of the dual TE method. Twodimensional NMR for fluid-typing is an important development of well logging technology.

关键词： NMR logging one-dimensional NMR two-dimensional NMR reservoir evaluation fluidtyping

A new NMR-data-based method for predicting petrophysical properties of tight sandstone reservoirs

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Energy Geoscience 2023年第2期4卷 64-71页

作者： Mi Liu ranhong xie Jun Li Hao Li Song Hu Youlong Zou Petroleum Exploration and Production Research Institute SINOPECBeijing100083China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China

Evaluating the permeability and irreducible water saturation of tight sandstone reservoirs is *** study uses distribution functions to fit measured NMR T_(2)distributions of tight sandstone reservoirs and extract parameters for characterizing pore size *** parameters are then used to establish prediction models for permeability and irreducible water saturation of *** of comparing the fit of the T_(2)distributions by the Gauss and Weibull distribution functions show that the fitting accuracy with the Weibull distribution function is *** physical meaning of the statistical parameters of the Weibull distribution function is defined to establish nonlinear prediction models of permeability and irreducible water saturation using the radial basis function(RBF)*** coefficients between the predicted values by the established models and the measured values of the tight sandstone core samples are 0.944 for permeability and 0.851 for irreducible water saturation,which highlight the effectiveness of the prediction models.

关键词： NMR Permeability Irreducible water saturation Tight sandstone Weibull distribution function RBF

大斜度井侧向测井三维正演数值模拟及曲线快速校正方法研究

维普期刊数据库评论

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维普期刊数据库

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石油勘探与开发 2000年第2期27卷 60-71页

作者：高杰谢然红石油大学

经典的电测井正演数值模拟多建立在地层关于井眼对称的前提下 ,而定向井 (水平井和大斜度井 )的客观存在 ,由于地层电阻率各向异性的影响 ,使得电测井三维数值模拟变得极为必要。在考虑常规双侧向测井和正演数值模拟计算的基础上 ,利用... 详细信息

经典的电测井正演数值模拟多建立在地层关于井眼对称的前提下 ,而定向井 (水平井和大斜度井 )的客观存在 ,由于地层电阻率各向异性的影响 ,使得电测井三维数值模拟变得极为必要。在考虑常规双侧向测井和正演数值模拟计算的基础上 ,利用三维有限元素法( 3D FEM )进行大斜度井中双侧向测井响应的数值模拟求解 ,并以不同倾角为条件验证了方法的有效性 ;进一步针对目前严格的电测井三维反演处理的不现实性 ,应用严格正演刻度下的快速反褶积处理方法进行定向井的电测井曲线校正。从模型处理结果看 ,给出的方法是可靠的 ,现场推广应用工作正在进行中 ,有望取得良好效果。

关键词：斜井侧向测井数值模拟曲线校正电测井

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冀东油田介电测井实验研究

测井技术 2000年第2期24卷 83-87页

作者：高卫国谢然红冀东油田勘探开发处石油大学

根据冀东油田 73块岩样测量结果 ,给出了砂岩骨架的介电常数值 ,讨论了岩石介电常数与含水饱和度、矿化度、泥质含量、比表面等因素之间的关系 ,为油田介电测井解释提供了可靠的解释公式及解释参数。

关键词：介电测井介电常数饱和度矿化度冀东油田

储层流体及其在岩石孔隙中的核磁共振弛豫温度特性

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地质学报 2007年第2期81卷 280-283,284页

作者：谢然红肖立志中国石油大学资源与信息学院北京102249

温度是影响核磁共振弛豫的一个因素。目前国内各实验室所做的核磁共振实验测量大都局限在室温下,实验温度与地下储集层温度有很大差别,因此有必要研究温度对流体及饱和流体岩石的核磁共振弛豫的影响,提高核磁共振测井资料评价精度。本... 详细信息

温度是影响核磁共振弛豫的一个因素。目前国内各实验室所做的核磁共振实验测量大都局限在室温下,实验温度与地下储集层温度有很大差别,因此有必要研究温度对流体及饱和流体岩石的核磁共振弛豫的影响,提高核磁共振测井资料评价精度。本文选取自由水、不同粘度脱气原油、饱和水以及饱和变压器油的储层贝瑞砂岩和储层碳酸盐岩样品进行核磁共振变温实验,测量温度从25℃变化到90℃。结果表明:自由水和原油的核磁共振横向弛豫时间(T2)都随温度的升高而增大。温度对饱和水贝瑞砂岩和碳酸盐岩核磁共振弛豫的影响不同,饱和水贝瑞砂岩核磁共振横向弛豫时间随温度升高而减小,而饱和水碳酸盐岩横向弛豫时间随温度升高而增大。无论是饱和油的贝瑞砂岩或是饱和油的碳酸盐岩,其核磁共振横向弛豫时间都随温度升高而增大。温度对核磁共振弛豫的影响,会造成室温下得到的横向弛豫时间截止值(T2cutoff)与储层温度下的实际值有偏差,影响储层束缚水饱和度和渗透率的计算结果,建议在核磁共振测井资料解释及应用时应考虑温度的影响。

关键词：核磁共振横向弛豫时间实验测量温度特性自由流体饱和流体岩石

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基于先验信息约束的核磁共振数据反演新方法

中国石油大学学报（自然科学版） 2019年第2期43卷 53-60页

作者：金国文谢然红徐红军郭江峰高伦中国石油大学(北京)油气资源与探测国家重点实验室北京102249 中国石油大学(北京)地球探测与信息技术北京市重点实验室北京102249 中国石油勘探开发研究院北京100083

针对核磁共振(NMR)测井T2谱短弛豫组分反演不精确的问题,提出一种基于先验信息约束的NMR反演新方法(ILT+)。首先利用积分变换方法直接从核磁共振原始回波数据中提取先验信息,具体为利用指数双曲正弦变换方法(ESHT)计算T_2谱锥形区域面积... 详细信息

针对核磁共振(NMR)测井T2谱短弛豫组分反演不精确的问题,提出一种基于先验信息约束的NMR反演新方法(ILT+)。首先利用积分变换方法直接从核磁共振原始回波数据中提取先验信息,具体为利用指数双曲正弦变换方法(ESHT)计算T_2谱锥形区域面积,利用梅林变换方法(MT)计算T_2的ω次幂的均值(〈T_2~ω〉);然后将提取的先验信息作为约束条件构造新的目标函数并反演求解。数值模拟和实际井资料处理结果表明:同时施加两种先验信息作为约束条件的ILT+方法综合了单独施加时的ILT+方法的优点,提高了T_2谱短弛豫组分的反演精度。新方法对于小孔占优的致密砂岩、页岩等非常规储层的NMR回波数据反演具有广阔的应用前景。

关键词：核磁共振反演积分变换先验信息短弛豫

基于核磁共振测井的致密气储层孔隙结构评价与分类

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地球物理学进展 2023年第2期38卷 759-767页

作者：王跃祥谢冰赖强赵佐安夏小勇谢然红中国石油西南油气田分公司勘探开发研究院成都610041 中国石油西南油气田分公司成都610041 中国石油大学(北京)地球物理学院北京102249

孔隙结构评价和储层类型划分对致密储层的勘探和开发具有重要意义.本文利用核磁共振测井对沙溪庙组致密气储层孔隙结构进行评价和分类.首先根据核磁共振T2分布形态利用模糊聚类的方法将致密砂岩储层孔隙结构分为Ⅰ、Ⅱ和Ⅲ类,随后结合... 详细信息

孔隙结构评价和储层类型划分对致密储层的勘探和开发具有重要意义.本文利用核磁共振测井对沙溪庙组致密气储层孔隙结构进行评价和分类.首先根据核磁共振T2分布形态利用模糊聚类的方法将致密砂岩储层孔隙结构分为Ⅰ、Ⅱ和Ⅲ类,随后结合压汞实验数据,利用变刻度幂函数法建立不同类型孔隙结构岩石T2分布转化毛管压力曲线的模型.根据建立的模型,我们将研究区实际核磁共振测井T2分布转化为毛管压力曲线,并计算储层孔隙结构参数,实现研究区致密气储层分类,通过岩心压汞实验数据和试油数据验证了储层分类结果的准确性.该方法可以扩展应用于其他地区致密储层的孔隙结构评价和分类.

关键词：致密砂岩孔隙结构核磁共振测井毛管压力曲线