基于元素俘获谱测井的川东北致密碎屑岩储层参数计算
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摘要
川东北地区须家河组须三段陆相碎屑岩沉积储集岩石成分和结构复杂、物性条件差、非均质性强,常规测井参数解释模型技术在应用中受到限制。针对川东北地区须家河组储层的特点和难点,建立一套以元素俘获谱测井(ECS)为基础测井评价方法。元素俘获谱测井利用快中子与地层中的原子核发生非弹性散射碰撞及热中子被俘获原理,通过解谱和氧化物闭合模型得到地层中主要造岩元素的相对百分含量,并应用聚类分析、因子分析等方法定量求解地层的各种氧化物含量。在此基础上,建立储层岩石骨架属性、计算孔隙度、饱和度等储层综合评价。该方法在川东北地区须家河组致密砂岩储层评价中具有指导意义。
Continental clastic reservoirs of Xu 3 Member of Xujiahe Formation in northeastern Sichuan Basin have complex rock composition and structure, poor physical properties and strong heterogeneity, and can't be well interpreted by a conventional logging parameter model. Based on this study, a log evaluation method has been established based on element captured spectra(ECS) log data. Following the principle of that elastic scattering collision takes place between fast neutrons and formation nuclei and then thermal neutron are captured, the ECS logging method can get the relative percent of primary elements in formation by spectral decomposition and an oxide closure model; then the contents of various oxides in formation can be quantitatively calculated by cluster analysis and factor analysis; and finally, reservoir evaluation can be carried out, involving porosity and saturation, properties of rock skeleton etc. Field application has proved that this method has guiding significance in the evaluation of tight sandstone reservoirs of Xujiahe Formation in northeastern Sichuan.
Continental clastic reservoirs of Xu 3 Member of Xujiahe Formation in northeastern Sichuan Basin have complex rock composition and structure, poor physical properties and strong heterogeneity, and can't be well interpreted by a conventional logging parameter model. Based on this study, a log evaluation method has been established based on element captured spectra(ECS) log data. Following the principle of that elastic scattering collision takes place between fast neutrons and formation nuclei and then thermal neutron are captured, the ECS logging method can get the relative percent of primary elements in formation by spectral decomposition and an oxide closure model; then the contents of various oxides in formation can be quantitatively calculated by cluster analysis and factor analysis; and finally, reservoir evaluation can be carried out, involving porosity and saturation, properties of rock skeleton etc. Field application has proved that this method has guiding significance in the evaluation of tight sandstone reservoirs of Xujiahe Formation in northeastern Sichuan.
引文
[1] 李舟波,王祝文.科学钻探中的元素测井技术 [J].地学前缘,1998,5(1-2):120-128.
[2] KRISTIANTO A,JONG Y,MOINARD L.Comparison of conventional log interpretation with neutron spectroscopy log and X-ray diffraction laboratory analysis:a case study [C]//International Petroleum Technology Conference,2008.
[3] EGBE S J,OMOLE O,JACOB D,YU G.Calibration of the elemental capture spectroscopy tool using the Niger Delta formation [C]//SPE111910,Abuja Nigeria:Society of Petroleum Engineers,2007.
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[5] 刘绪纲,孙建孟,郭云峰,等.元素俘获谱测井在储层综合评价中的应用 [J].测井技术,2005,29(3):237-239.
[6] 蔡德洋,章成广,信毅,等.利用元素俘获测井评价致密砂岩岩性及有效性 [J].工程地球物理学报,2012,9(4):440-442.
[7] 盘昌林,刘树根,马永生,等.川东北须家河组储层特征及主控因素 [J].西南石油大学学报(自然科学版),2011,33(3):28-33.
[8] 刘绪纲,孙建孟,李召成.新一代元素俘获谱测井仪(ECS)及其应用 [J].同位素,2002,15(增刊):8-13.
[9] 程华国,袁祖贵.用地层元素测井(ECS)资料评价复杂地层岩性变化 [J].核电子学与探测技术,2005,25(3):233-238.
[10] 黄隆基.放射性测井原理 [M].北京:石油工业出版社,1985.
[11] 曹燕宁,张利萍,范利群,等.元素俘获谱测井仪(ECS)在四川油气田的应用 [J].重庆科技学院学报,2009,11(1):65-67.
[12] 袁祖贵.地层元素测井(ECS)评价油水层 [J].核电子学与探测技术,2004,24(2):126-131.
[13] 石强.钙质砂岩中碳酸盐含量的计算及校正 [J].测井技术,1996,20(5):330-334.
[14] 王智,金立新,关强,等.基于FMI与ECS的火山岩储层综合评价方法 [J].西南石油大学学报(自然科学版),2010,32(5):58-64.
[15] 袁祖贵,成晓宁,孙娟,等.地层元素测井(ECS):一种全面评价储层的测井新技术 [J].原子能科学技术,2004,38(增刊):209-213.
[16] 雍世和.最优化测井解释 [M].东营:中国石油大学出版社,1995.
[17] 袁祖贵,楚泽涵.一种新的测井方法(ECS)在王庄稠油油藏中的应用 [J].核电子学与探测技术,2003,23(5):417-423.
(1)非法定计量单位,1 mD=0.987×10-3 μm2,下同
[2] KRISTIANTO A,JONG Y,MOINARD L.Comparison of conventional log interpretation with neutron spectroscopy log and X-ray diffraction laboratory analysis:a case study [C]//International Petroleum Technology Conference,2008.
[3] EGBE S J,OMOLE O,JACOB D,YU G.Calibration of the elemental capture spectroscopy tool using the Niger Delta formation [C]//SPE111910,Abuja Nigeria:Society of Petroleum Engineers,2007.
[4] ZHAO Z A,TANG X P,YU G D.Use of elemental capture spectroscopy to accurately determine reservoir lithology and porosity in high pressure and high H2S environment [C]//SPE131210,USA:Society of Petroleum Engineers,2010.
[5] 刘绪纲,孙建孟,郭云峰,等.元素俘获谱测井在储层综合评价中的应用 [J].测井技术,2005,29(3):237-239.
[6] 蔡德洋,章成广,信毅,等.利用元素俘获测井评价致密砂岩岩性及有效性 [J].工程地球物理学报,2012,9(4):440-442.
[7] 盘昌林,刘树根,马永生,等.川东北须家河组储层特征及主控因素 [J].西南石油大学学报(自然科学版),2011,33(3):28-33.
[8] 刘绪纲,孙建孟,李召成.新一代元素俘获谱测井仪(ECS)及其应用 [J].同位素,2002,15(增刊):8-13.
[9] 程华国,袁祖贵.用地层元素测井(ECS)资料评价复杂地层岩性变化 [J].核电子学与探测技术,2005,25(3):233-238.
[10] 黄隆基.放射性测井原理 [M].北京:石油工业出版社,1985.
[11] 曹燕宁,张利萍,范利群,等.元素俘获谱测井仪(ECS)在四川油气田的应用 [J].重庆科技学院学报,2009,11(1):65-67.
[12] 袁祖贵.地层元素测井(ECS)评价油水层 [J].核电子学与探测技术,2004,24(2):126-131.
[13] 石强.钙质砂岩中碳酸盐含量的计算及校正 [J].测井技术,1996,20(5):330-334.
[14] 王智,金立新,关强,等.基于FMI与ECS的火山岩储层综合评价方法 [J].西南石油大学学报(自然科学版),2010,32(5):58-64.
[15] 袁祖贵,成晓宁,孙娟,等.地层元素测井(ECS):一种全面评价储层的测井新技术 [J].原子能科学技术,2004,38(增刊):209-213.
[16] 雍世和.最优化测井解释 [M].东营:中国石油大学出版社,1995.
[17] 袁祖贵,楚泽涵.一种新的测井方法(ECS)在王庄稠油油藏中的应用 [J].核电子学与探测技术,2003,23(5):417-423.
(1)非法定计量单位,1 mD=0.987×10-3 μm2,下同