公开(公告)号：US6133735A

公开(公告)日：2000-10-17

申请号：US198535

申请日：1998-11-24

申请人： Martin D. Hurlimann ,  Yi-Quao Song ,  Seungoh Ryu ,  Pabitra N. Sen

发明人： Martin D. Hurlimann ,  Yi-Quao Song ,  Seungoh Ryu ,  Pabitra N. Sen

IPC分类号： G01R33/44 ,  G01V3/32 ,  G01V3/00

CPC分类号： G01V3/32 ,  G01N24/081

摘要： A technique is provided for determining a nuclear magnetic resonance characteristic of formations surrounding an earth borehole, including the following steps: providing a logging device that is moveable through the borehole; providing, on the logging device, first and second coils having respective axes that are generally orthogonal; producing, at the logging device, a prepolarizing signal; applying pulse sequence signals to the first and second coils, the pulse sequence signals implementing repeated refocusing of spins in the formations by both adiabatic and non-adiabatic reorienting of the spins to form spin echoes; and detecting, at the logging device, the spin echoes from the formations, the spin echoes being indicative of the nuclear magnetic resonance characteristic of the formations.

摘要翻译： 提供了一种用于确定围绕地球钻孔的地层的核磁共振特性的技术，包括以下步骤：提供可通过钻孔移动的测井装置; 在测井装置上提供具有大致正交的相应轴的第一和第二线圈; 在测井装置处产生预偏振信号; 将脉冲序列信号施加到第一和第二线圈，脉冲序列信号通过绝热的绝热和非绝热重新定向来形成自旋回波，从而在地层中重复重新聚焦在地层中; 并且在测井装置处检测来自地层的自旋回波，自旋回波指示地层的核磁共振特征。