基于对现有核磁共振测井流体识别方法局限性的分析,提出了一种核磁共振测井构建水谱流体识别新方法。由于受到流体性质和孔隙结构两个关键因素的影响,目前常用的差谱法和移谱法核磁共振测井流体识别方法流体识别能力受到很大的局限,导致流体识别符合率较低。构建水谱法流体识别技术采用现有核磁共振测井的采集模式,利用长等待时间、短回波间隔模式下测量的T2（横向弛豫时间）谱信息构建完全含水状态下长等待时间、长回波间隔模式下的T2谱,通过对比测量T2谱和构建水谱之间的差异确定储集层的流体类型。通过对南堡凹陷油层、油水同层、水层、气层、低电阻率油层的识别实例,证明该方法消除了孔隙结构导致的流体识别符合率较低问题,提高了核磁共振测井流体识别能力,对于复杂储集层流体性质识别和评价具有广阔应用前景。图7参10
胡法龙
,
周灿灿
,
李潮流
,
徐红军
,
周凤鸣
,
司兆伟
. 核磁共振测井构建水谱法流体识别技术[J]. 石油勘探与开发, 2016
, 43(2)
: 244
-252
.
DOI: 10.11698/PED.2016.02.10
A new fluid identification method by constructing water spectrum based on NMR logging was put forward after the limitations of existing nuclear magnetic resonance (NMR) fluid identification methods were analyzed. At present, differential spectrum method (DSM) and shifted spectrum method (SSM) of NMR logging are commonly used fluid identification methods. Due to the effects of fluid properties and pore structures, however, their coincidence rates of fluid identification are lower. A new fluid identification method named water spectrum construction method was developed in this study. Based on the existing acquisition mode of NMR logging, T2 (transverse relaxation time) spectrum of long waiting time and long echo spacing in completely watered conditions was constructed from the T2 spectrum which was measured in the mode of long waiting time and short echo spacing. And then, the types of fluids in reservoirs were identified by comparing the measured T2 spectrum with the constructed water spectrum. This new method was applied in Nanpu sag, Bohai Bay Basin for identifying oil layers, oil-water layers, water layers, gas layers and low-resistivity oil layers. It is demonstrated that based on the water spectrum construction method, the coincidence rate of fluid identification caused by pore structures is increased and fluid identification capacity of NMR logging is improved. Water spectrum construction method is prospective for fluid identification and evaluation of complex reservoirs.
[1] 肖立志. 核磁共振成像测井与岩石核磁共振及其应用[M]. 北京: 科学出版社, 1998.
XIAO Lizhi. Nuclear magnetic resonance logging and core magnetic resonance imaging and its application[M]. Beijing: Science Press, 1998.
[2] 肖立志. 我国核磁共振测井应用中的若干重要问题[J]. 测井技术, 2007, 31(5): 401-407.
XIAO Lizhi. Some important issues for NMR logging applications in China[J]. Well Logging Techology, 2007, 31(5): 401-407.
[3] 何宗斌, 倪静, 伍东, 等. 根据双TE测井确定含烃饱和度[J]. 岩性油气藏, 2007, 19(3): 89-92.
HE Zongbin, NI Jing, WU Dong, et al. Hydrocarbon saturation determined by dual TE logging[J]. Lithologic Reservoirs, 2007, 19(3): 89-92.
[4] 谢然红, 肖立志, 邓克俊, 等. 二维核磁共振测井[J]. 测井技术, 2005, 29(5): 430-434.
XIE Ranhong, XIAO Lizhi, DENG Kejun, et al. Two-dimensional NMR logging[J]. Well Logging Techology, 2005, 29(5): 430-434.
[5] 谭茂金, 邹友龙, 刘兵开, 等. 气水模型( T 2 , D )二维核磁共振测井数值模拟及参数影响分析[J]. 测井技术, 2011, 35(2): 130-136.
TAN Maojin, ZOU Youlong, LIU Bingkai, et al. Inversion simulation of ( T 2 , D ) 2D NMR logging and analysis of observation parameters effects in gas-water model[J]. Well Logging Techology, 2011, 35(2): 130-136.
[6] 胡法龙, 周灿灿, 李潮流, 等. 基于扩散—弛豫的二维核磁共振测井流体识别方法研究[J]. 石油勘探与开发, 2012, 39(5): 552-558.
HU Falong, ZHOU Cancan, LI Chaoliu, et al. Fluid identification method based on 2D diffusion-relaxation nuclear magnetic resonance (NMR)[J]. Petroleum Exploration and Development, 2012, 39(5): 552-558.
[7] 欧阳健, 毛志强, 修立军, 等. 测井低对比度油层成因机理与评价方法[M]. 北京: 石油工业出版社, 2009.
OUYANG Jian, MAO Zhiqiang, XIU Lijun, et al. Formation mechanism and evaluation method of low contrast reservoir in well logging[M]. Beijing: Petroleum Industry Press, 2009.
[8] 周凤鸣, 司兆伟, 马越蛟, 等. 南堡凹陷低电阻率油气层综合识别方法[J]. 石油勘探与开发, 2008, 35(6): 680-684.
ZHOU Fengming, SI Zhaowei, MA Yuejiao, et al. Integrated identification method for low-resistivity hydrocarbon layers in Nanpu Sag[J]. Petroleum Exploration and Development, 2008, 35(6): 680-684.
[9] 王忠东, 汪浩, 向天德. 综合利用核磁谱差分与谱位移测井提高油层解释精度[J]. 测井技术, 2001, 25(5): 365-368.
WANG Zhongdong, WANG Hao, Xiang Tiande. Integration of NMR DTW Logs and DTE Logs to improve the oilbed interpretation accuracy[J]. Well Logging Technology, 2001, 25(5): 365-368.
[10] 胡法龙, 肖立志. 一种核磁共振测井信号强度的确定方法[J]. 核电子学与探测技术, 2006, 26(5): 557-560.
HU Falong, XIAO Lizhi. A method for determining NMR log signal intensity[J]. Nuclear Electronics & Detection Technology, 2006, 26(5): 557-560.
