US 2020/0264331 A1 · METHODS FOR DETERMINING FLUID VOLUMES FROM NMR T1-T2 LOG DATA

Abstract

Methods and systems are provided for characterizing fluids in a subterranean formation traversed by a borehole, where NMR data is measured by a downhole NMR tool that is conveyed in the borehole that traverses the formation. The NMR data is processed to derive T1-T2 maps at different depths of the formation. The T1-T2 maps at different depths of the formation can be processed to generate a cluster map of different fluids that are present in the formation, wherein the cluster map is a two-dimensional array of grid points in the T1-T2 domain with each grid point being assigned or classified to a specific fluid. The cluster map of different fluids that are present in the formation can be used to characterize properties of the formation, such as fluid volumes for the different fluids at one or a number of depths.

Claims20

Dependent claims

A method of characterizing fluids in a subterranean formation traversed by a borehole, comprising:

a) measuring NMR data by a downhole NMR tool that is conveyed in the borehole that traverses the formation;
b) processing the NMR data of a) to derive T1-T2 maps at different depths of the formation;
c) processing the T1-T2 maps at different depths of the formation of b) to generate a cluster map of different fluids that are present in the formation, wherein the cluster map is a two-dimensional array of grid points in the T1-T2 domain with each grid point being assigned or classified to a specific fluid;
and
d) using the cluster map of different fluids that are present in the formation of c) to characterize properties of the formation.

2 more elements

A system for characterizing fluids in a subterranean formation traversed by a borehole, comprising:

a downhole NMR tool that is conveyed in the borehole that traverses the formation and measures NMR data;
and
at least one processor that is configured to
i) process the NMR data to derive T1-T2 maps at different depths of the formation;
ii) process the T1-T2 maps at different depths of the formation of i) to generate a cluster map of different fluids that are present in the formation, wherein the cluster map is a two-dimensional array of grid points in the T1-T2 domain with each grid point being assigned or classified to a specific fluid;
and
iii) using the cluster map of different fluids that are present in the formation of ii) to characterize properties of the formation.

4 more elements

Dependencies are inferred from the claim text.

Methods for determining fluid volumes from nmr t1-t2 log data

Life of this patent

Methods for determining fluid volumes from nmr t1-t2 log data

Life of this patent

Abstract

Claims20