Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.
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Transcript of Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.
![Page 1: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/1.jpg)
Elastic Inversion Using Partial Stack Seismic Data: Case
Histories in China
![Page 2: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/2.jpg)
OutlineOutline
Introduction
Work Flow
Case Histories
Conclusions
Introduction
![Page 3: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/3.jpg)
Background of Elastic Parameter Inversion
),,;,,,( 222111 SpSpPP VVVVfR
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![Page 4: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/4.jpg)
Background of Elastic Parameter Inversion
Comparison of elastic impedance and acoustic impedance on recognizing of reservoir lithology
(According to Connolly.Patrick,1999)
![Page 5: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/5.jpg)
Background of Elastic Parameter Inversion
Result of Acoustic Impedance Inversion
Result of Elastic Impedance Inversion
(According to Connolly.Patrick,1999)
Oil-bearing reservoir Unidentified
Oil-bearing reservoir identified clearly
![Page 6: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/6.jpg)
OutlineOutline
Introduction
Work Flow
Case Histories
Conclusions
![Page 7: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/7.jpg)
Seismic data processing
Petrophysical modeling
Elastic impedance generation
Wavelet estimation and horizon calibration
AVA Constrained Sparse Spike Inversion
Work Flow of Elastic Parameter Inversion
![Page 8: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/8.jpg)
Seismic Data Processing Flow
INPUT COMMON-SHOT GATHERS
Amplitude Recovery
Filtering
Spiking Deconvolution
Bandpass Filter
CMP Sorting
Residual Statics
Velocity Analysis
Kirchhoff Pre-stack Time Migration
Common-angle Gather Extraction
Limited-angle Stacking
OUTPUT MIGRATED COMMON-ANGLE DATA
3-D Random Noise Attenuation
![Page 9: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/9.jpg)
0-10 deg 10-20 deg
Full stack20-30 deg
Seismic Data Volume of Partial Angle Gather Stack
![Page 10: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/10.jpg)
Shale volume Total porosity Temperature , pressure, fluid type & density
Vp&Vs modeling of brine-bearing reservoirs
Vp&Vs modeling of oil & gas-bearing reservoirs
Cross-plot analysis of elastic parameters of lithologies & fluids
Petrophysical model: Xu&White (DEM) & SCA
Petrophysical Modeling
Calculation of elastic parameters
Guide to identifying reservoirs & fluids
![Page 11: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/11.jpg)
Petrophysical Modeling
A plot of petrophysical modeling of borehole logging data
Vsh Density M-PVp Sw M-PVsShear
modulus Lambda Poisson’s
ratio Vp/Vs S-imp P-imp Total porosity
![Page 12: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/12.jpg)
Cross-plot Analysis of Elastic Parameters
shSw
Sand
Shale
Oil sand
Brine sand Brine sand
Oil sand
S-impedance
P-
imp
ed
an
ce
Lambda
Vp
/ V
s
P-
imp
ed
an
ce
Vp / Vs
S-impedanceP-impedanceVp / VsSwTotal-ProVsh
![Page 13: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/13.jpg)
Wavelet & synthetic seismogram(0-10deg angle gathers stack)
Wavelet Estimation and Horizon Calibration
Various wavelets are extracted from near, middle and far offset angle gather stack seismic data using elastic impedance curves corresponding with angle series of seismic data.
Wavelet & synthetic seismogram(10-20deg angle gathers stack)
Wavelet & synthetic seismogram(20-30deg angle gathers stack)
![Page 14: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/14.jpg)
Wavelet analysis of different angle gathers
0-10deg
10-20deg
20-30deg
Wavelet Estimation and Horizon Calibration
Interpolated wavelet & interpolation weights
Wavelet amplitude spectrum, phase spectrum, and time-frequency analysis
![Page 15: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/15.jpg)
OutlineOutline
Introduction
Work Flow
Case Histories
Conclusions
Case Histories
![Page 16: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/16.jpg)
0-10deg
10-20deg
20-30deg
Case 1. Changqing Oilfield
Coal bed
![Page 17: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/17.jpg)
S-impedance
P-impedance
Case 1. Changqing Oilfield
Gas sandstone
Sandstone existence
![Page 18: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/18.jpg)
Case 1. Changqing Oilfield
Lambda
Gas sandstone
Well BWell A
Gas sandstone
Vp/Vs
![Page 19: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/19.jpg)
0-12deg 12-24deg
fullstack24-36deg
Case 2. Zhunger Oilfield
![Page 20: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/20.jpg)
P-impedance of post-stack acoustic inversion
Case 2. Zhunger Oilfield
P-impedance of pre-stack elastic inversion
![Page 21: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/21.jpg)
Poisson’s ratio
Case 2. Zhunger Oilfield
S-impedance
![Page 22: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/22.jpg)
Vp/Vs
S-impedance
Case 2. Zhunger Oilfield
![Page 23: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/23.jpg)
Case 2. Zhunger Oilfield
Red and yellow colors
show the favorable
distribution of
oil-bearing reservoirs
Favorable area :
40 Km2
Dry well
Oil well
Proposed well
![Page 24: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/24.jpg)
OutlineOutline
Introduction
Work Flow
Case Histories
Conclusions Conclusions
![Page 25: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/25.jpg)
Elastic inversion is more powerful than conventional post-stack acoustic inversion, which provides more petro-physical parameters used in identifying lithology and fluid distribution in a reservoir.
Our elastic inversion result fits very well with drilling results.
Elastic inversion obviously is a major direction in reservoir characterization.
Conclusions
![Page 26: Elastic Inversion Using Partial Stack Seismic Data: Case Histories in China.](https://reader035.fdocuments.in/reader035/viewer/2022062314/56649e1b5503460f94b093af/html5/thumbnails/26.jpg)
Thank you for your attention!