Turning High Resolution Geophysics Upside-down: Application of Seismic Inversion to Site Investigation and Geohazard Problems

2004 ◽  
Author(s):  
I.W. Hamilton ◽  
B. Hartley ◽  
C. Angheluta ◽  
A. Digby
Keyword(s):  
High Resolution ◽  
Site Investigation ◽  
Seismic Inversion

An ultra-high-resolution 3D marine seismic system for detailed site investigation

2017 ◽  
Vol 15 (4) ◽  
pp. 335-345 ◽  
Author(s):  
Olivier Monrigal ◽  
Ivan de Jong ◽  
Henrique Duarte
Keyword(s):  
High Resolution ◽  
Site Investigation ◽  
Marine Seismic ◽  
Seismic System

scholarly journals High-resolution prestack seismic inversion using a hybrid FISTA least-squares strategy

Geophysics ◽  
2013 ◽  
Vol 78 (5) ◽  
pp. R185-R195 ◽  
Author(s):  
Daniel O. Pérez ◽  
Danilo R. Velis ◽  
Mauricio D. Sacchi
Keyword(s):  
High Resolution ◽  
Least Squares ◽  
Large Scale ◽  
Cost Effective ◽  
Seismic Inversion ◽  
Iterative Solvers ◽  
Gradient Algorithm ◽  
Inversion Method ◽  
Thresholding Algorithm ◽  
Sparse Solutions

A new inversion method to estimate high-resolution amplitude-versus-angle attributes (AVA) attributes such as intercept and gradient from prestack data is presented. The proposed technique promotes sparse-spike reflectivities that, when convolved with the source wavelet, fit the observed data. The inversion is carried out using a hybrid two-step strategy that combines fast iterative shrinkage-thresholding algorithm (FISTA) and a standard least-squares (LS) inversion. FISTA, which can be viewed as an extension of the classical gradient algorithm, provides sparse solutions by minimizing the misfit between the modeled and the observed data, and the [Formula: see text]-norm of the solution. FISTA is used to estimate the location in time of the main reflectors. Then, LS is used to retrieve the appropriate reflectivity amplitudes that honor the data. FISTA, like other iterative solvers for [Formula: see text]-norm regularization, does not require matrices in explicit form, making it easy to apply, economic in computational terms, and adequate for solving large-scale problems. As a consequence, the FISTA+LS strategy represents a simple and cost-effective new procedure to solve the AVA inversion problem. Results on synthetic and field data show that the proposed hybrid method can obtain high-resolution AVA attributes from noisy observations, making it an interesting alternative to conventional methods.

scholarly journals Simultaneous Inversion of Shallow Seismic Data for Imaging of Sulfurized Carbonates

Minerals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 203 ◽  
Author(s):  
Kamil Cichostępski ◽  
Jerzy Dec ◽  
Anna Kwietniak
Keyword(s):  
High Resolution ◽  
Sulfur Content ◽  
Signal To Noise Ratio ◽  
Seismic Inversion ◽  
Carbonate Sediments ◽  
Seismic Profiles ◽  
Simultaneous Inversion ◽  
Se Poland ◽  
Shallow Seismic ◽  
Seismic Surveying

In this article, we present a high-resolution shallow seismic surveying method for imaging the inner structure of the Miocene evaporitic formation, where sulfur ore occurs. The survey was completed in the northern part of the Carpathian Foredeep (SE Poland) where sulfur deposits occur up to a depth of ca. 260 m. In this region, the sulfur ore is strata-bound and exists within a carbonate interval of a thickness of approximately 28 m. The average sulfur content reaches up to 30%. Five seismic profiles were acquired with a total length of 2450 m. The acquisition was designed to obtain high-resolution, long offsets and a satisfactory signal-to-noise ratio. In the field, we used 48 channels and variable end-on roll-along spread that allowed us to record offsets of up to 375 m. Data processing was aimed at preserving relative amplitudes (known as RAP, relative amplitude preservation processing), an approach that is necessary for seismic inversion application. With the utilization of well log data and results of simultaneous inversion, we were able to calculate the elastic properties of the deposit to evaluate sulfur ore content and changes in lithology. The sulfur content is strongly dependent on the carbonate reservoir’s porosity. To evaluate porosity changes and associated sulfur content, a simultaneous inversion procedure was used. This is a pioneering approach in which we applied pre-stack inversion methods to shallow carbonate sediments.

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