公开(公告)号：US20030231017A1

公开(公告)日：2003-12-18

申请号：US10442585

申请日：2003-05-21

Applicant: Baker Hughes Incorporated

Inventor： Christian Kiesl ,  Thomas Kruspe ,  Holger F. Thern ,  Iris Surholt

IPC: G01V003/00

CPC classification number: E21B33/1243 ,  E21B43/26 ,  E21B49/008 ,  E21B49/06 ,  E21B49/10 ,  E21B2041/0028 ,  G01N3/32 ,  G01N15/082 ,  G01N24/081 ,  G01V3/32

Abstract: An apparatus and method for determining a parameter of interest of a formation composed of carbonate rock. A nuclear magnetic resonance (NMR) sensor assembly produces a pulsed RF field designed for obtaining measurements indicative of the parameter of interest of the formation. A downhole processor processes the measurements for obtaining BVI and BVM using a cutoff time based on classification of the carbonate. Further processing is done to estimate the permeability of the carbonate.

Abstract translation: 一种用于确定由碳酸盐岩组成的地层的感兴趣参数的装置和方法。 核磁共振（NMR）传感器组件产生设计用于获得指示地层感兴趣的参数的测量的脉冲RF场。 井下处理器使用基于碳酸盐分类的截止时间来处理用于获得BVI和BVM的测量。 进行进一步处理以估计碳酸盐的渗透性。

公开(公告)号：US20030016013A1

公开(公告)日：2003-01-23

申请号：US10191153

申请日：2002-07-09

Applicant: BAKER HUGHES INCORPORATED.

Inventor： Thomas Kruspe ,  Martin Blanz ,  Peter Rottengatter ,  Holger F. Thern

IPC: G01V003/00

CPC classification number: G01R33/50 ,  G01V3/32

Abstract: NMR data are acquired with variable spacing between refocusing pulses, giving data with a variable interecho time TE. Under certain conditions, diffusion effects can be neglected and data acquired with a multiple TE spacing may be used to obtain a T2 distribution with increased resolution and reduced power requirements. In gas reservoirs, the maximum TE may be determined from diffusion considerations using a dual wait time pulse sequence and this maximum TE is used to acquire data with dual TE. By proper selection of TE, echos can be obtained with significantly reduced ringing.