MRT二维核磁共振测井方法及应用  

Method and Application of MRT Two Dimensional NMR Logging

作　　者：王雷 周军 雷晓阳 宋京京 朱万里 孙佩 WANG Lei;ZHOU Jun;LEI Xiaoyang;SONG Jingjing;ZHU Wanli;SUN Pei(Logging Technology Research Center Profile,China Petroleum Logging CO.LTD.,Xi’an,Shaanxi 710077,China;Changqing Branch,China Petroleum Logging CO.LTD.,Xi’an,Shaanxi 710200,China)

机构地区：[1]中国石油集团测井有限公司测井技术研究院,陕西西安710077 [2]中国石油集团测井有限公司长庆分公司,陕西西安710200

出　　处：《测井技术》2021年第4期399-404,共6页Well Logging Technology

摘　　要：随着核磁共振(NMR)测井技术发展与应用的深入,一维核磁共振测井技术在复杂储层流体识别中的局限性显现。通过二维核磁共振测井得到的横向弛豫时间T_(2)、纵向弛豫时间T_(1)和扩散系数D等信息能够更好地区分复杂储层流体性质,优于一维核磁共振测井。中国自主研发的MRT核磁共振测井仪自推广应用以来,一维核磁共振测井在各大油田得到广泛应用,急需向二维核磁共振测井拓展,以满足现场需求。该文通过数值模拟梯度场下二维核磁共振信号,提出了一种适合于低信噪比条件下的二维核磁共振反演方法,反演得到的二维核磁共振谱与模型具有较好的一致性。针对MRT6910仪器数据采集与处理特性,设计了适合于T_(2)-T_(1)以及T_(2)-D测量的组合观测模式,能够在不改变仪器硬件条件下,一次下井得到T_(2)-T_(1)和T_(2)-D图谱。在测井现场进行信号采集与资料处理,取得较好效果。With the development and application of NMR logging technology,the limitations of 1D NMR logging technology in complex reservoir fluid identification appear.The lateral relaxation time,vertical relaxation time and diffusion coefficient and so on obtained by 2D NMR logging can distinguish complex reservoir fluid properties better than 1D NMR logging.Since the popularization and application,MRT,the domestic self-developed multi frequency NMR logging tool has been widely used 1D NMR logging in many major oilfields.It is urgent to expand to 2D NMR logging to meet the needs of the oilfields.In this paper,a 2D NMR inversion method suitable for low signal to noise ratio is proposed by numerical simulation of 2D NMR signal in gradient field.The obtained 2D NMR spectra are in good agreement with the model.According to the data acquisition and processing characteristics of MRT6910 instrument,a combined observation mode suitable for T_(2)-T_(1)and T_(2)-D measurement is designed,which can get T_(2)-T_(1)and T_(2)-D spectra at the same time without changing the hardware of the instrument.Good results have been achieved in signal acquisition and data processing in logging field.

关 键 词：二维核磁共振测井 MRT6910 反演方法 数值模拟 T_(2)-T_(1)图谱 T_(2)-D图谱 组合观测模式 

分 类 号：P631.84[天文地球—地质矿产勘探]