Joint sensor orientation and velocity model calibration

Patent metadata

Field	Value
Publication number	US-11215722-B2
Application number	US-202016855925-A
Country	US
Kind code	B2
Filing date	Apr 22, 2020
Priority date	Apr 25, 2019
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A method can include receiving microseismic data of microseismic events as acquired by sensors during hydraulic fracturing of a geologic region; jointly calibrating sensor orientation of the sensors and a velocity model of the geologic region via an objective function and the microseismic data; and, based at least in part on the jointly calibrating, determining one or more locations of the one or more microseismic events.

First claim

What is claimed is:

1. A method ( 1000 ) comprising:
receiving microseismic data of microseismic events as acquired by sensors during hydraulic fracturing of a geologic region ( 1010 );
jointly calibrating sensor orientation of the sensors and a velocity model of the geologic region via an objective function and the microseismic data ( 1020 ), and adjusting an orientation of at least one of the sensors based at least in part on the jointly calibrating; and
based at least in part on the jointly calibrating, determining one or more locations of the one or more microseismic events ( 1030 ).

2. The method of claim 1 wherein the one or more locations correspond to a fracture generated by the hydraulic fracturing.

3. The method of claim 1 wherein the objective function comprises at least one signal-to-noise ratio (SNR) term selected from a P-wave SNR term (SNRP) and an S-wave SNR term (SNRS).

4. The method of claim 1 wherein the objective function comprises a coalescence microseismic mapping objective function.

5. The method of claim 1 wherein the velocity model is a 1D velocity model.

6. The method of claim 1 comprising, based at least in part on the one or more locations, determining whether a fracture generated by the hydraulic fracturing conforms to a planned fracture.

7. The method of claim 1 wherein the sensors comprise three-component seismic sensors.

8. The method of claim 1 wherein the sensors comprise sensors disposed in one or more boreholes, wherein a borehole of the one or more boreholes comprises a borehole coordinate system and wherein a sensor of the sensors comprises a corresponding housing that comprises a housing coordinate system wherein sensor orientation is defined with respect to the borehole coordinate system and the housing coordinate system.

9. One or more computer-readable storage media comprising computer-executable instructions to instruct a system to perform a method according to any of claims 1 to 8 .

10. A system ( 1100 ) comprising:
a processor ( 1102 );
memory ( 1104 ) accessible by the processor;
processor-executable instructions stored in the memory that comprise instructions to instruct the system to:
receive microseismic data of microseismic events as acquired by sensors during hydraulic fracturing of a geologic region ( 1011 );
jointly calibrate sensor orientation of the sensors and a velocity model of the geologic region via an objective function and the microseismic data ( 1021 )), and adjust an orientation of at least one of the sensors based at least in part on the jointly calibrating; and
based at least in part on the jointly calibration, determine one or more locations of the one or more microseismic events ( 1031 ).

11. The system of claim 10 wherein the one or more locations correspond to a fracture generated by the hydraulic fracturing.

12. The system of claim 10 wherein the objective function comprises at least one signal-to-noise ratio (SNR) term.

13. The system of claim 10 wherein the objective function comprises a coalescence microseismic mapping objective function.

14. The system of claim 10 wherein the velocity model is a 1D velocity model.

Assignees

• Schlumberger Technology Corp

Inventors

• Le Calvez Joel Herve
• Mizuno Takashi

Classifications

• G01V1/303

  for determining velocity profiles or travel times · CPC title

• G01V1/52

  Structural details · CPC title

• G01V1/288 Primary

  Event detection in seismic signals, e.g. microseismics (G01V1/36 takes precedence) · CPC title

• G01V1/282 Primary

  Application of seismic models, synthetic seismograms · CPC title

• G01V2210/1299

  Subsurface, e.g. in borehole or below weathering layer or mud line · CPC title