Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"pre-stack"”.
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Automating Pre-Stack Migration Enhancement and Image Quality Analysis
… problems need to be treated before applying a stack. The ideal case of layers in ADCIGs should be flat without smear amplitude throughout all angles. Using this principle, I process one reflection at a time in each iteration by isolating it into a local window and then flattening it. Also, I …
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Acoustic full-waveform to elastic pre-stack seismic inversion of the Yakutat Terrane, Gulf of Alaska
… fold and thrust-fault formation. I generate a compressional velocity model of the Yakutat microplate using two-dimensional acoustic and isotropic time-domain full waveform inversion (FWI) of marine seismic reflection and refraction data from the STEEP project (ST. Elias Erosion/tectonics Project). …
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Pre-stack depth migration and attribute analysis of 3-D time-lapse P-wave data, Vacuum field, New Mexico
Includes bibliographical references (pages 72-75).
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USING AVO ANALYSIS TO DETERMINE THE GAS RESERVOIRS IN THE SOUTH THRACE BASIN, NORTHWEST TURKEY
… using AVO modeling and analysis for 3D pre-stack seismic data acquired by Turkish Petroleum Corporation in the Thrace Basin located in the northwest part of Turkey. The Thrace Basin is Turkey’s the most productive onshore gas province, and is the largest and thickest sedimentary basin in …
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Enhancement of temporal and spatial resolution of 2-D reflection data: application to Texaco data over Venice Dome in Plaquemines Parish, Louisiana
… of stretched amplitude adjustment (SAGC), pre-stack deconvolution, and post-stack migration improve the temporal and spatial resolution of Texaco Line 6, facilitating interpretation of the salt structure geometry beneath the line. Applied through DISCO (Cogniseis) processing software along …
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A unified approach to complex seismic imaging problems
… solution which converges rapidly. It is based on pre-stack depth migration and cell-stripping tomography in heterogeneous media, which allow layer-stripping and retain all the information from the data, incorporates a depth focusing technique for improved image resolution and utilizes …
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Real–Time Imaging of Decimetre–Resolution 3D Seismic Volumes
… known industry methods produce effective and impressive results by considering an object identification case study in a shallow–water, harbour setting (Vardy et al., 2008). Both stacked and migrated volumes are used to identify 89 individual buried targets that are correlated with coincident …
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Challenges of geophysical processes and interpretation of an unconventional play: a case study from Wattenberg field, Denver-Julesburg Basin, Colorado, The
… to characterize, due to what could be interpreted as sudden lateral stratigraphic changes, potential stress variations, and the inability to use Gassmann's Fluid Substitution theory directly. While general trends of limited permeability, over-pressurized tight-porosity, and highly-fractured …
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A Multicomponent Walkaway Vertical Seismic Profile Experiment in a Heavy Oil Reservoir
… was successfully processed and used to predict rock properties in a heavy oil reservoir. Post-stack image and pre-stack gathers were made for inversion and AVO analysis. A common shot reflectivity gather was also created for AVO study at the VSP well location. P and S-wave impedance, …
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A Geological Interpretation of 3D Seismic Data of a Salt Structure and Subsalt Horizons in the Mississippi Canyon Subdivision of the Gulf of Mexico
<p>The Gulf of Mexico (GOM) represents a challenge for exploration and production. Most of the sediments coming from North America has bypassed the shelf margin into Deep Water. In an Attempt to attack this challenge this thesis pretends to break the GOM's false bottom, mainly comprised by diverse …
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Efficient seismic imaging with the double plane wave data
… However, implementing the traditional pre-stack shot profile RTM is computationally expensive. Time consuming wavefield propagation processes need to be performed for each shot gather to obtain high resolution images. The traditional RTM can become extremely expensive with increasing …
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I. THE FIRST MULTI-DIMENSIONAL INVERSE-SCATTERING-SERIES INTERNAL-MULTIPLE-ELIMINATION METHOD: A NEW TOOLBOX OPTION FOR REMOVING INTERNAL MULTIPLES THAT INTERFERE WITH A PRIMARY, WITHOUT DAMAGING THE PRIMARY, AND WITHOUT ANY KNOWLEDGE OF SUBSURFACE PROPERTIES II. TESTS AND ANALYSIS FOR RESOLUTION COMPARISONS BETWEEN REVERSE TIME MIGRATION (RTM) AND THE FIRST MIGRATION METHOD THAT IS EQUALLY EFFECTIVE AT ALL FREQUENCIES AT THE TARGET
… to serve that goal and objective. This thesis represents progress in two different links in this chain, (1) the internal-multiple removal and (2) the first migration method that is equally effective at all frequencies at the target. The organization of the thesis is as follows. First, we provide …
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DESCRIPTION OF THE BAKKEN FORMATION’S ROCK PROPERTIES OF THE WILLISTON BASIN, NORTH DAKOTA
… most frequently used, by which the seismic interpreters derive lithology and physical properties. In this study, the 2D pre-stack seismic data was obtained from the analysis of Ross Field of the Williston Basin located in North Dakota. The Williston Basin has been used as a production area for …
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Interpretation of shear wave birefringence in P to S converted waves data using the propagator matrix method
We present an original method for estimating local shear wave birefringence properties for 3D surface P to S converted waves. To accomplish this we approach the problem using reverse VSP (RVSP). The method works in the pre-stack domain and uses the P waves converted to S as shear wave sources. We …
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Extracting Polar Anisotropy Parameters from Seismic Data
… synthetic data for comparison; this procedure suppresses the anisotropy information in the real data. In this study, I tested a new method, using log data of Vp, Vs, and density, together with seismic pre-stack Common Depth Point (CDP) gathers near the well site, to deduce anisotropy parameters …
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Time-lapse Acoustic Imaging of Oceanic Fronts and Eddies
… of 1--12~km and thicknesses of 100--200~m. Pre-stack analysis demonstrates that this eddy field is being advected onto the shelf at speeds of \textit{O}(0.1)~m~s$^{-1}$. An iterative inverse modelling procedure is used to convert reflectivity into temperature and salinity, which confirms …
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Seismic Imaging and Velocity Model Building in the Thrace Region, Northwestern Turkey: A Case Study
… processing and imaging techniques. Kirchhoff pre-stack time and depth migration are used. Tomography approach was used to refine the velocities to get the final interval velocity. Having the final interval velocity, reverse-time migration was used. The tomographic velocity analysis was …
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Pore fluid pressure detection within the plate boundary fault interface of the Costa Rica convergent margin using AVO attributes
… elevated pore fluid content and pore fluid pressure along the Costa Rica convergent margin to address dewatering processes of subduction zone sediments. These data provide the highest quality 3D seismic data acquired to date along a convergent margin for detailed analysis of geophysical …
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Crustal, Thermal, and Structural Controls on Hydrocarbon Systems in the Delaware Basin, West Texas, and Southeastern New Mexico
This dissertation presents an integrated analysis of the geophysical and geothermal expression of Mesoproterozoic – early Miocene tectonic events affecting hydrocarbon production in the Delaware Basin, the western physiographical province of the complexly structured, intracratonic Greater Permian …
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