Vsp-based depth domain seismic profile horizon calibration method and apparatus

Patent metadata

Field	Value
Publication number	US-2025035805-A1
Application number	US-202218697133-A
Country	US
Kind code	A1
Filing date	Jun 30, 2022
Priority date	Dec 30, 2021
Publication date	Jan 30, 2025
Grant date	—

Abstract

A VSP-based depth domain seismic profile horizon calibration method includes steps: obtaining VSP wavefield data of a depth domain (S10); determining first arrival time information on the basis of the VSP wavefield data (S20); processing the VSP wavefield data on the basis of a preset filtering method and the first arrival time information to obtain upgoing wave data (S30); generating a zero offset profile of the depth domain on the basis of the upgoing wave data (S40); and calibrating, on the basis of the zero offset profile, a depth-domain profile to be calibrated, so as to generate a corresponding calibration result (S50). Also provided are a VSP-based depth domain seismic profile horizon calibration apparatus and a computer-readable storage medium.

First claim

1 . A VSP-based depth domain seismic profile horizon calibration method, comprising:
obtaining vertical seismic profile (VSP) wavefield data of a depth domain from a borehole acquisition instrument; determining first arrival time information on the basis of the VSP wavefield data; processing the VSP wavefield data on the basis of a preset filtering method and the first arrival time information to obtain upgoing wave data; generating a zero offset profile of the depth domain on the basis of the upgoing wave data; and calibrating, on the basis of the zero offset profile, a depth-domain profile to be calibrated, so as to generate a corresponding calibration result, wherein the calibration result comprises depth accuracy evaluation information of the profile of the depth domain and corresponding correction suggestion information.

2 . The method according to claim 1 , wherein the preset filtering method comprises a median filtering method and a mean filtering method; and
processing the VSP wavefield data on the basis of a preset filtering method and the first arrival time information to obtain upgoing wave data comprises: processing the VSP wavefield data on the basis of the median filtering method or the mean filtering method to determine a corresponding upgoing wave and downgoing wave; determining a first time window on the basis of the first arrival time information; processing the downgoing wave on the basis of the first time window to obtain a downgoing wavelet; executing deconvolution processing on the upgoing wave in data after wavefield separation on the basis of the downgoing wavelet to obtain deconvoluted data; and executing amplitude compensation processing on the deconvoluted data to obtain the upgoing wave data.

3 . The method according to claim 1 , wherein generating the zero offset profile of the depth domain on the basis of the upgoing wave data comprises:
determining upgoing wave amplitude information of the depth domain on the basis of the upgoing wave data; and processing the upgoing wave amplitude information on the basis of a preset multichannel filtering method to obtain the zero offset profile of the depth domain.

4 . The method according to claim 3 , wherein determining the upgoing wave amplitude information of the depth domain on the basis of the upgoing wave data comprises:
determining a plurality of preset output depth positions in the depth domain; determining a second time window on the basis of the first arrival time information; and processing the upgoing wave data on the plurality of preset output depth positions on the basis of the second time window to obtain the upgoing wave amplitude information.

5 . The method according to claim 4 , wherein processing the upgoing wave amplitude information on the basis of the preset multichannel filtering method to obtain the zero offset profile of the depth domain comprises:
extracting the upgoing wave amplitude information to obtain a plurality of corresponding depth-domain data, wherein the upgoing wave amplitude information is in one-to-one correspondence to the plurality of preset output depth positions; and processing the plurality of depth-domain data on the basis of the preset multichannel filtering method to obtain the zero offset profile of the depth domain.

6 . The method according to claim 1 , wherein calibrating, on the basis of the zero offset profile, a depth-domain profile to be calibrated, so as to generate a corresponding calibration result, comprises:
determining the to-be-calibrated depth-domain profile; determining a depth error between the zero offset profile and the to-be-calibrated depth-domain profile and a corresponding relationship of reflection characteristics; and analyzing the depth error and the corresponding relationship of the reflection characteristics to generate the corresponding calibration result.

7 . A VSP-based depth domain seismic profile horizon calibration apparatus, comprising:
a borehole seismic wavefield obtaining unit, configured to obtain VSP wavefield data of a depth domain from a borehole acquisition instrument; a first arrival time obtaining unit, configured to determine first arrival time information on the basis of the VSP wavefield data; a preprocessing unit, configured to process the VSP wavefield data on the basis of a preset filtering method and the first arrival time information to obtain upgoing wave data; a profile information generating unit, configured to generate a zero offset profile of the depth domain on the basis of the upgoing wave data; and a calibrating unit, configured to calibrate, on the basis of the zero offset profile, a depth-domain profile to be calibrated, so as to generate a corresponding calibration result, wherein the calibration result comprises depth accuracy evaluation information of the depth-domain profile and corresponding correction suggestion information.

8 . The apparatus according to claim 7 , wherein the preset filtering method comprises a median filtering method and a mean filtering method, and the preprocessing unit comprises:
a wavefield separating module, configured to process the VSP wavefield data on the basis of the median filtering method or the mean filtering method to determine a corresponding upgoing wave and downgoing wave; a first time window determining module, configured to determine a first time window on the basis of the first arrival time information; a wavelet obtaining module, configured to process the downgoing wave on the basis of the first time window to obtain a downgoing wavelet; a wavelet deconvolution module, configured to executing deconvolution processing on the upgoing wave in data after wavefield separation on the basis of the downgoing wavelet to obtain deconvoluted data; and an amplitude compensating module, configured to execute amplitude compensation processing on the deconvoluted data to obtain the upgoing wave data.

9 . The apparatus according to claim 7 , wherein the profile information generating unit comprises:
a depth domain amplitude value extracting module, configured to determine upgoing wave amplitude information of the depth domain on the basis of the upgoing wave data; and a filtering module, configured to process the upgoing wave amplitude information on the basis of a preset multichannel filtering method to obtain the zero offset profile of the depth domain.

10 . The apparatus according to claim 9 , wherein the depth domain amplitude value extracting module is specifically configured to:
determine a plurality of preset output depth positions in the depth domain; determine a second time window on the basis of the first arrival time information; and process the upgoing wave data on the plurality of preset output depth positions on the basis of the second time window to obtain the upgoing wave amplitude information.

11 . The apparatus according to claim 10 , wherein the filtering module is specifically configured to:
extract the upgoing wave amplitude information to obtain a plurality of corresponding depth-domain data, wherein the upgoing wave amplitude information is in one-to-one correspondence to the plurality of preset output depth positions; and process the plurality of depth-domain data on the basis of the preset multichannel filtering method to obtain the zero offset profile of the depth domain.

12 . The apparatus according to claim 7 , wherein the calibrating unit is specifically configured to:
determine the to-be-calibrated depth-domain profile; determine a depth error between the zero offset profile and the to-be-calibrated depth-domain profile and a corresponding relationship of reflection characteris

Assignees

• China Nat Petroleum Corp
• Bgp Inc China Nat Pet Corp

Inventors

• Li Yanpeng
• Chen Yuanzhong
• Wang Jing
• Jin Qihu

Classifications

• G01V2210/161

  Vertical seismic profiling [VSP] · CPC title

• G01V1/50 Primary

  Analysing data · CPC title

• G01V2210/53

  Statics correction, e.g. weathering layer or transformation to a datum · CPC title

• G01V2210/6222

  Velocity; travel time · CPC title

• G01V2210/24

  Multi-trace filtering · CPC title