Joint sensor orientation and velocity model calibration
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.
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.