Determination of the optimal filtering parameters to find close associations of seismic inversion attributes

2020 ◽  
Vol 4 ◽  
pp. 27-29
Author(s):  
A.V. Novoyavchev ◽  
◽  
A.A. Kleimenov ◽  
M.Yu. Tokarev ◽  
K.M. Myatchin ◽  
...  
Keyword(s):  
Seismic Inversion ◽  
Optimal Filtering

Quantitative interpretation using facies-based seismic inversion

2017 ◽  
Vol 5 (3) ◽  
pp. SL1-SL8 ◽  
Author(s):  
Ehsan Zabihi Naeini ◽  
Russell Exley
Keyword(s):  
Seismic Data ◽  
Low Frequency ◽  
Seismic Inversion ◽  
Quantitative Interpretation ◽  
Frequency Model ◽  
Amplitude Variation With Offset ◽  
Limited Bandwidth ◽  
Seismic Amplitude ◽  
Primary Signal

Quantitative interpretation (QI) is an important part of successful exploration, appraisal, and development activities. Seismic amplitude variation with offset (AVO) provides the primary signal for the vast majority of QI studies allowing the determination of elastic properties from which facies can be determined. Unfortunately, many established AVO-based seismic inversion algorithms are hindered by not fully accounting for inherent subsurface facies variations and also by requiring the addition of a preconceived low-frequency model to supplement the limited bandwidth of the input seismic. We apply a novel joint impedance and facies inversion applied to a North Sea prospect using broadband seismic data. The focus was to demonstrate the significant advantages of inverting for each facies individually and iteratively determine an optimized low-frequency model from facies-derived depth trends. The results generated several scenarios for potential facies distributions thereby providing guidance to future appraisal and development decisions.

scholarly journals Inversion and interpretation of seismic-derived rock properties in the Duvernay play

2018 ◽  
Vol 6 (2) ◽  
pp. SE1-SE14 ◽  
Author(s):  
Ronald M. Weir ◽  
David W. Eaton ◽  
Larry R. Lines ◽  
Donald C. Lawton ◽  
Eneanwan Ekpo
Keyword(s):  
Joint Inversion ◽  
Seismic Inversion ◽  
Rock Properties ◽  
Data Set ◽  
Structural Mapping ◽  
Amplitude Variation With Offset ◽  
Multicomponent Seismic ◽  
Depth Relationship ◽  
And Inversion

We have developed an interpretive seismic workflow that incorporates multicomponent seismic inversion, guided by structural mapping, for characterizing low-permeability unconventional reservoirs. The workflow includes the determination of a calibrated time-depth relationship, generation of seismic-derived structural maps, poststack inversion, amplitude-variation-with-offset analysis, and PP-PS joint inversion. The subsequent interpretation procedure combines structural and inversion results with seismic-derived lithologic parameters, such as the Young’s modulus, Poisson’s ratio, and brittleness index. We applied this workflow to a 3D multicomponent seismic data set from the Duvernay play in the Kaybob area in Alberta, Canada. Subtle faults are discernible using isochron maps, horizontal time slices, and seismic stratal slices. Fault-detection software is also used to aid in the delineation of structural discontinuities. We found that seismic-derived attributes, coupled with structural mapping, can be used to map reservoir facies and thus to highlight zones that are most favorable for hydraulic-fracture stimulation. By imaging structural discontinuities and preexisting zones of weakness, seismic mapping also contributes to an improved framework for understanding the induced-seismicity risk.

Fast seismic inversion

Geophysics ◽  
1983 ◽  
Vol 48 (10) ◽  
pp. 1371-1372 ◽  
Author(s):  
W. Keith McClary
Keyword(s):  
Inverse Problem ◽  
Layered Medium ◽  
Normal Incidence ◽  
Seismic Inversion ◽  
Reflection Coefficients ◽  
Type B ◽  
Layer Model ◽  
Type C ◽  
Layer Problem

The equal traveltime layer model of a horizontally layered medium with waves at normal incidence is used to solve the inverse problem (determination of the reflection coefficients and fundamental polynomials from the surface response) by an efficient algorithm using [Formula: see text] computations for N layers. The idea is to reduce the N‐layer problem to two similar problems of N/2 layers each plus additional computations of type B and C. Type B computes the data for the second problem from the result of the first and type C combines the results. For [Formula: see text] the reduction is carried out k times leading to N trivial one‐layer problems plus more computations of type B and C, which are polynomial multiplications or discrete convolutions. The improvement over the [Formula: see text] computations required by recursive methods comes from using the fast Fourier transform to perform the convolutions.

scholarly journals Algorithm for post-processing of tomography images to calculate the dimension-geometric features of porous structures

2021 ◽  
Vol 45 (1) ◽  
pp. 110-121
Author(s):  
M.V. Chukalina ◽  
A.V. Khafizov ◽  
V.V. Kokhan ◽  
A.V. Buzmakov ◽  
R.A. Senin ◽  
...  
Keyword(s):  
Ct Images ◽  
Optimal Filtering ◽  
Porous Structures ◽  
Post Processing ◽  
Model Data ◽  
Otsu Method ◽  
Image Generator ◽  
Determination Of Parameters ◽  
Selection Of

An algorithm for post-processing of the grayscale 3D computed tomography (CT) images of porous structures with the automatic selection of filtering parameters is proposed. The determination of parameters is carried out on a representative part of the image under analysis. A criterion for the search for optimal filtering parameters based on the count of "levitating stone" voxels is described. The stages of CT image filtering and its binarization are performed sequentially. Bilateral and anisotropic diffuse filtering is implemented; the Otsu method for unbalanced classes is chosen for binarization. Verification of the proposed algorithm was carried out on model data. To create model porous structures, we used our image generator, which implements the function of anisotropic porous structures generation. Results of the post-processing of real CT images containing noise and reconstruction artifacts by the proposed method are discussed.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

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