System and method for petro-elastic modeling

Patent metadata

Field	Value
Publication number	US-10386512-B2
Application number	US-201715667709-A
Country	US
Kind code	B2
Filing date	Aug 3, 2017
Priority date	Aug 5, 2016
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A method is described for creating a petro-elastic model including receiving, at a computer processor, well log data; computing in situ rock properties; calculating dry frame moduli for a range of porosities based on a rock physics model such as a modified critical porosity model; performing fluid substitutions and computing elastic properties by statistical sampling for the range of porosities; creating a petro-elastic model in a seismic domain; and identifying and producing target hydrocarbon reservoirs based on the petro-elastic model. The method may be executed by a computer system.

First claim

What is claimed is:

1. A computer-implemented method of petro-elastic modeling, comprising:
a. receiving, at a computer processor, well log data;
b. computing in situ rock properties;
c. calculating dry frame moduli for a range of porosities;
d. performing fluid substitutions and computing elastic properties for the range of porosities to create synthetic data points for the range of porosities;
e. creating a petro-elastic model in a seismic domain based on the synthetic data points; and
f. identifying and producing target hydrocarbon reservoirs based on the petro-elastic model.

2. The method of claim 1 wherein the creating the petro-elastic model calculates seismic attributes based on the synthetic data points.

3. The method of claim 1 wherein the synthetic data points for the range of porosities are calibrated to the in situ rock properties.

4. The method of claim 1 wherein the creating the petro-elastic model includes data driven statistical sampling of Vp, Vs, and density values for fluid substituted data points binned by combination of the in situ rock properties and the computed elastic properties for the range of porosities over small porosity intervals to generate statistical and data driven porosity sweep models for different fluid cases.

5. The method of claim 1 wherein the calculating dry frame moduli uses a modified critical porosity model.

6. A computer system, comprising:
one or more processors;
memory; and

one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions that when executed by the one or more processors cause the device to:
a. receive, at a computer processor, well log data;
b. compute in situ rock properties;
c. calculate dry frame moduli for a range of porosities;
d. perform fluid substitutions and compute elastic properties for the range of porosities to create synthetic data points for the range of porosities;
e. create a petro-elastic model in a seismic domain based on the synthetic data points; and
f. identify and produce target hydrocarbon reservoirs based on the petro-elastic model.

7. A non-transitory computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by an electronic device with one or more processors and memory, cause the device to
a. receive, at a computer processor, well log data;
b. compute in situ rock properties;
c. calculate dry frame moduli for a range of porosities;
d. perform fluid substitutions and compute elastic properties for the range of porosities to create synthetic data points for the range of porosities;
e. create a petro-elastic model in a seismic domain based on the synthetic data points; and
f. identify and produce target hydrocarbon reservoirs based on the petro-elastic model.

Assignees

• Chevron Usa Inc

Inventors

• Roy Prasenjit
• KRISHNAMURTHY Kabilan
• Skelt Christopher H
• Stefani Joseph P
• Tiwary Dileep K

Classifications

• G01V2210/62

  Physical property of subsurface · CPC title

• G01V2210/66

  Subsurface modeling · CPC title

• G01V2210/624

  Reservoir parameters · CPC title

• G01V1/282 Primary

  Application of seismic models, synthetic seismograms · CPC title

• G01V1/50 Primary

  Analysing data · CPC title