公开(公告)号：US20140074405A1

公开(公告)日：2014-03-13

申请号：US14083375

申请日：2013-11-18

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： LALITHA VENKATARAMANAN ,  TAREK M. HABASHY ,  DENISE E. FREED ,  ASHOK BELANI

IPC: G01V3/14

CPC classification number: G01N24/081 ,  G01N11/16 ,  G01R33/448 ,  G01V3/14 ,  G01V3/32

Abstract: Methods and related systems are described for estimating fluid or rock properties from NMR measurements. A modified pulse sequence is provided that can directly provide moments of relaxation-time or diffusion distributions. This pulse sequence can be adapted to the desired moment of relaxation-time or diffusion coefficient. The data from this pulse sequence provides direct estimates of fluid properties such as average chain length and viscosity of a hydrocarbon. In comparison to the uniformly-spaced pulse sequence, these pulse sequences are faster and have a lower error bar in computing the fluid properties.

Abstract translation: 描述了用于从NMR测量估计流体或岩石性质的方法和相关系统。 提供了可以直接提供弛豫时间或扩散分布的时刻的修改的脉冲序列。 该脉冲序列可以适应于所需的弛豫时间或扩散系数。 来自该脉冲序列的数据提供流体性质的直接估计，例如烃的平均链长和粘度。 与均匀间隔的脉冲序列相比，这些脉冲序列更快，在计算流体特性时具有较低的误差。