Duijndam.DevOn Monday 18th April 2022 I gave a presentation, on the subject of Low Frequency Seismic Acquisition on Land
This presentation was the first one out of a series of four e-lectures that are part of the EAGE Distinguished Lecturer Programme (DLP)
Feel free to download and use the slides used in this presentation, but please make a reference to me as author when you (re-) distribute (some of) these slides.
Geophysical and Geographical library built using Excel-DNA, with User Defined Functions (UDFs) to enhance MS Excel.
This is the second version of the library, and for that reason all function names start with “GL2“, followed by the category name and the finally the function name itself
Current revision is 11-10-2021. Recent issues in Excel required an update related to use of dynamic array formulas.
The library now contains the following function categories:
AVO functions (.avo)
Configuration functions (.cfg)
Fourier functions (.fft)
GIS functions (.gis)
Library functions (.lib)
Pore Fluid functions (.pfl)
Ray tracing functions (.ray)
Rock Property functions (.rok)
Taper functions (.tpr)
Wavelet functions (.wav)Add-In commands (from the GeoLib Ribbon)
An example function name is therefore: GL2.lib.Version()
See for a complete function listing below. All functions are equipped with context sensitive help.
AVO Functions
GL2.avo.AB_Fit
GL2.avo.ABC_Fit
GL2.avo.AkiRichards
GL2.avo.Bortfeld2
GL2.avo.Bortfeld3
GL2.avo.Fatti3
GL2.avo.Shuey2
GL2.avo.Shuey3
GL2.avo.Zoeppritz
Configuration Functions
GL2.cfg.AddOrUpdateKey
GL2.cfg.ClearKeys
GL2.cfg.ReadAllKeys
GL2.cfg.ReadKey
GL2.cfg.RemoveKey
Fourier Functions
GL2.fft.Convolve
GL2.fft.Correlate
GL2.fft.Forward
GL2.fft.Inverse
GIS Functions
Based on DotSpatial.Positioning and DotSpatial.Projections
Note: work is underway to replace these libraries by .NET bindings of the widely supported Proj library
GL2.gis.AngleToDMS
GL2.gis.CrsToEsriString
GL2.gis.CrsToProj4String
GL2.gis.DMSToAngle
GL2.gis.Reproject
Library Functions
GL2.lib.CompileTime
GL2.lib.DynamicArraysSupported
GL2.lib.InstallationPath
GL2.lib.OperatingSystem
GL2.lib.Version
Pore Fluid Functions (temperature and pressure dependent)
Based on MATLAB code by Dhananjay Kumar.
Note: these functions are therefore not related to the FLAG library from the University of Houston
GL2.pfl.BrineBulkModulus
GL2.pfl.BrineDensity
GL2.pfl.BrineVelocity
GL2.pfl.GasBulkModulus
GL2.pfl.GasDensity
GL2.pfl.GasVelocity
GL2.pfl.OilBulkModulus
GL2.pfl.OilDensity
GL2.pfl.OilVelocity
GL2.pfl.WaterBulkModulus
GL2.pfl.WaterDensity
GL2.pfl.WaterVelocity
Ray Tracing Functions
GL2.ray.Offset
GL2.ray.Segment
GL2.ray.Segments
Rock Property Functions
GL2.rok.API2AbsoluteDensity
GL2.rok.API2RelativeDensity
GL2.rok.BulkModulus
GL2.rok.Density2Porosity
GL2.rok.Density2Velocity
GL2.rok.FluidSubstitutionAvseth
GL2.rok.FluidSubstitutionSmith
GL2.rok.GassmannAvseth
GL2.rok.GassmannKumar
GL2.rok.GassmannSmith
GL2.rok.HillAverage
GL2.rok.Porosity2Density
GL2.rok.RelativeDensity2API
GL2.rok.ReussAverage
GL2.rok.RockProperties
GL2.rok.ShearModulus
GL2.rok.Velocity2Density
GL2.rok.VoigtAverage
GL2.rok.Vpressure
GL2.rok.Vshear
Taper Functions
GL2.tpr.Bartlett
GL2.tpr.Blackman
GL2.tpr.BlackmanHarris
GL2.tpr.Cosine
GL2.tpr.exactBlackman
GL2.tpr.Gaussian
GL2.tpr.Hamming
GL2.tpr.Hanning
GL2.tpr.Tukey
GL2.tpr.TukeyModified
Wavelet Functions
GL2.wav.Berlage
GL2.wav.ButterworthBP
GL2.wav.ButterworthLP
GL2.wav.Klauder
GL2.wav.LFSweep
GL2.wav.LFSweepIF
GL2.wav.LFSweepIT
GL2.wav.LinSweep
GL2.wav.Ormsby
GL2.wav.Ricker
GL2.wav.Sinc
GeoLib Add-In Commands (accessible from the Ribbon)
About_GeoLib
Depth_Chart_Dialog
Ray_Tracer_Wizard
Show_Help
Version_Info
On 19 October I gave a presentation on the acquisition of low frequencies for reflection seismic, at the EAGE conference in Amsterdam. The talk was called “How Low Can You Practically Go“.
Feel free to download and use the slides used in this presentation, but please make a reference to me as author when you (re-) distribute these slides.
Geophysical and Geographical library built using Excel-DNA, with User Defined Functions (UDFs) to enhance MS Excel.
This is revision 25-05-2021 of the second version of the library, and for that reason all function names start with “GL2“, followed by the category name and the finally the function name itself
The library now contains the following function categories:
AVO functions (.avo)
Configuration functions (.cfg)
Fourier functions (.fft)
GIS functions (.gis)
Library functions (.lib)
Pore Fluid functions (.pfl)
Ray tracing functions (.ray)
Rock Property functions (.rok)
Taper functions (.tpr)
Wavelet functions (.wav)Add-In commands (from the GeoLib Ribbon)
An example function name is therefore: GL2.lib.Version()
See for a complete function listing below. All functions are equipped with context sensitive help.
AVO Functions
GL2.avo.AB_Fit
GL2.avo.ABC_Fit
GL2.avo.AkiRichards
GL2.avo.Bortfeld2
GL2.avo.Bortfeld3
GL2.avo.Fatti3
GL2.avo.Shuey2
GL2.avo.Shuey3
GL2.avo.Zoeppritz
Configuration Functions
GL2.cfg.AddOrUpdateKey
GL2.cfg.ClearKeys
GL2.cfg.ReadAllKeys
GL2.cfg.ReadKey
GL2.cfg.RemoveKey
Fourier Functions
GL2.fft.Convolve
GL2.fft.Correlate
GL2.fft.Forward
GL2.fft.Inverse
GIS Functions
GL2.gis.AngleToDMS
GL2.gis.CrsToEsriString
GL2.gis.CrsToProj4String
GL2.gis.DMSToAngle
GL2.gis.Reproject
Library Functions
GL2.lib.CompileTime
GL2.lib.DynamicArraysSupported
GL2.lib.OperatingSystem
GL2.lib.Version
Pore Fluid Functions (temp and pressure dependent)
GL2.pfl.BrineBulkModulus
GL2.pfl.BrineDensity
GL2.pfl.BrineVelocity
GL2.pfl.GasBulkModulus
GL2.pfl.GasDensity
GL2.pfl.GasVelocity
GL2.pfl.OilBulkModulus
GL2.pfl.OilDensity
GL2.pfl.OilVelocity
GL2.pfl.WaterBulkModulus
GL2.pfl.WaterDensity
GL2.pfl.WaterVelocity
Ray Tracing Functions
GL2.ray.Offset
GL2.ray.Segment
GL2.ray.Segments
Rock Property Functions
GL2.rok.API2AbsoluteDensity
GL2.rok.API2RelativeDensity
GL2.rok.BulkModulus
GL2.rok.Density2Porosity
GL2.rok.Density2Velocity
GL2.rok.FluidSubstitutionAvseth
GL2.rok.FluidSubstitutionSmith
GL2.rok.GassmannAvseth
GL2.rok.GassmannKumar
GL2.rok.GassmannSmith
GL2.rok.HillAverage
GL2.rok.Porosity2Density
GL2.rok.RelativeDensity2API
GL2.rok.ReussAverage
GL2.rok.RockProperties
GL2.rok.ShearModulus
GL2.rok.Velocity2Density
GL2.rok.VoigtAverage
GL2.rok.Vpressure
GL2.rok.Vshear
Taper Functions
GL2.tpr.Bartlett
GL2.tpr.Blackman
GL2.tpr.BlackmanHarris
GL2.tpr.Cosine
GL2.tpr.exactBlackman
GL2.tpr.Gaussian
GL2.tpr.Hamming
GL2.tpr.Hanning
GL2.tpr.Tukey
GL2.tpr.TukeyModified
Wavelet Functions
GL2.wav.Berlage
GL2.wav.ButterworthBP
GL2.wav.ButterworthLP
GL2.wav.Klauder
GL2.wav.LFSweep
GL2.wav.LFSweepIF
GL2.wav.LFSweepIT
GL2.wav.LinSweep
GL2.wav.Ormsby
GL2.wav.Ricker
GL2.wav.Sinc
GeoLib Add-In Commands (accessible from the Ribbon)
About_GeoLib
Depth_Chart_Dialog
Ray_Tracer_Wizard
Show_Help
Version_Info
Seismic detectors, both geophones and hydrophones, are considered to be the most vulnerable part in the seismic data acquisition chain. They are in need of constant quality control and maintenance. Reliable quality control of these detectors depends upon accurate measurement of the electro-dynamical parameters, such as sensitivity, resonance frequency and damping.
These can in principal be derived from the detector’s dlmamic response to a step-wise varying current. The measured response can be fitted to a physical model of the detector by means of System Identification techniques.
This makes it possible to estimate the quality of the design, or the present state of the detector, and assess whether it meets the manufacturer’s specifications.
The analysis method presented here yields asymptotically unbiased estimates of the electro-dynamical characteristics in the presence of white noise. Dynamic responses from under-critically, critically, and overcritically damped detectors may be analyzed.