Searched for: contributor%3A%22Verschuur%2C+D.J.+%28promotor%29%22
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Alfaraj, Ali (author)
Imaging and inversion with seismic data recorded with sources and receivers at the surface are powerful tools to infer knowledge about the subsurface. However, creating an image with seismic data is unfortunately not as easy as taking a picture with a smartphone. The estimated subsurface models in many situations are far from ideal due to the...
doctoral thesis 2024
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Revelo Obando, B.A. (author)
Seismic survey design deals with determining the acquisition parameters that lead to the best possible imaging and characterization of the subsurface. The design of the survey is constrained by health, safety and environmental considerations and the available budget, seeking for a balance between quality and cost. Because seismic exploration is...
doctoral thesis 2024
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Nath, A. (author)
Seismic reflection imaging aims to generate a representation of the subsurface of the earth using acoustic or elastic waves recorded in the form of seismic data. During the processing of the data for imaging, we pick a part of the data as signal and discard the rest as noise. Since so-called primary wavefields carry the single-scattering...
doctoral thesis 2023
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El Marhfoul, B. (author)
Geophysics is a branch of physics that is mainly concerned about under- standing and describing the physical behaviour and activities of the earth’s geological system. Usually, seismic data is acquired at the surface and the corresponding signals go through a sequence of preprocessing steps to filter out the noise and enhance the quality of the...
doctoral thesis 2023
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Kontakis, A. (author)
Nearly-simultaneous-source (blended) acquisition differs from conventional acquisition in that seismic wavefields originating from different sources are allowed to overlap in the recorded seismic traces. This allows more flexibility in deciding the number of shots, the shot density and the effective acquisition time of a survey, but it adds the...
doctoral thesis 2023
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Zhang, D. (author)
For exploration and development of the earth, seismic surveys are acquired to provide information about the subsurface, within specifications of accuracy set by geologists and engineers, and within business constraints on budgets and turn-around time for processing and interpretation of the data. The case of seismic surveys that are acquired,...
doctoral thesis 2022
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Vinard, N. (author)
When humans started started exploiting the abundant underground natural resources the Earth has to offer such as hydrocarbons, minerals and heat, we started to experience earthquakes that are related to this exploitation, so called induced earthquakes. Under certain conditions those can damage local infrastructure. However, most events are weak...
doctoral thesis 2022
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Hammad, H.I.A. (author)
The seismic method has many applications. It is important in the critical sector of energy. Besides being used in imaging oil and gas reservoirs, it is also utilized in other sectors of energy such as geothermal energy exploration and development. It also plays a role in extracting other resources such as minerals or in the process of monitoring...
doctoral thesis 2021
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Taskin, U. (author)
Breast cancer is the most common type of cancer for women and in developed countries it forms one of their largest threats. Many studies have shown that early detection by screening is important for achieving a successful treatment and reducing the mortality rate. Nowadaysmammography is the gold standard for breast cancer screening. However,...
doctoral thesis 2021
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Wu, S. (author)
Seismic data acquisition is a trade-off between cost and data quality subject to operational constraints. Due to budget limitations, 3D seismic acquisition usually does not have a dense spatial sampling in all dimensions. This causes artefacts in the processed images, velocity models, or other physical properties. However, we rely on, for...
doctoral thesis 2020
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Qu, S. (author)
During the past decade, time-lapse seismic technology has been widely applied in hydrocarbon reservoir management. It is a very powerful method to obtain information on reservoir changes in the inter-well regions. This information helps to identify bypassed hydrocarbons and extend the economic life of a field. In a typical scenario, one baseline...
doctoral thesis 2020
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Sharma, S. (author)
Seismic waves from active experiments carry information regarding the subsurface in the form of reflected data that is recorded at the surface. This recorded data is subjected to sophisticated processing methods to estimate relevant parameters describing the geology of the subsurface. Traditionally the recorded data is used to create an image of...
doctoral thesis 2019
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Masaya, S. (author)
Seismic imaging is a significant technology to provide the image of the subsurface in several fields such as hydrocarbon exploration/production and civil engineering. A fundamental problem in seismic imaging is that both the depth reflectivity and velocity distribution of the subsurface have to be predicted by only seismic events observed at the...
doctoral thesis 2018
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Staal, X.R. (author)
Seismic imaging projects aim to reveal the structure of the earths crust from seismic data. These projects typically include three separate processing steps, being: • attenuation of multiple reflections in the seismic data. • estimating seismic wave propagation velocities from the seismic data. • mapping the measured reflection data to the...
doctoral thesis 2015
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Soni, A.K. (author)
Until now, in most seismic imaging technologies, both surface and internal multiples are considered as noise. In today’s industrial practice, we see various methods for suppressing multiples before migration. This means that only a fraction of the recorded wavefield is used in imaging. In this thesis, we present a method termed full wavefield...
doctoral thesis 2014
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Kutscha, H. (author)
Many seismic data processing and imaging processes require densely and regularly sampled data, whereas the actual measurements are mostly irregularly and sparsely sampled. Therefore, seismic data reconstruction methods are utilised as a pre-processing step. Within the class of transformation-based reconstruction techniques, observed seismic data...
doctoral thesis 2014
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Chitu, D.A. (author)
The estimation of a velocity model is an important step in seismic imaging. To a large extend, seismic data interpretation is implicitly based on this model. Thus, the velocity model influences important conclusions such as size and shape of the reservoir and the expected volume of producible hydrocarbons. In the Common Focus Point (CFP)...
doctoral thesis 2011
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Ghazali, A.R. (author)
A gas cloud is a region of gas accumulation in the subsurface, which can severely deteriorate the seismic data quality from deeper reflectors. Due to complex wave propagation through the anomaly and the resulting transmission imprint on the reflections from below this area, the image below the gas cloud is usually not properly recovered. The...
doctoral thesis 2011
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Pörtzgen, N. (author)
Ultrasonic non-destructive testing is a renowned method for the inspection of girth welds. However, defect sizing and characterization remains challenging with the current inspection philosophy. In addition, data display and interpretation is not straightforward and requires skill and experience from the inspector. A better and more reliable...
doctoral thesis 2007
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Hindriks, C.O.H. (author)
A seismic survey is conducted to acquire data which can be used to image the earth's discontuinities. On land, the near surface disturb the data severely, due to its strongly heterogeneous character. Commonly used methods use single trace methods to correct for these near surface effects based on simplified models and are known as 'statics',...
doctoral thesis 2007
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