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sep:research:theses:sep153 [2014/07/17 07:04] adam created |
sep:research:theses:sep153 [2015/05/27 02:06] (current) |
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//by [[http:// | //by [[http:// | ||
- | Full thesis | + | Full thesis |
**Table of contents** | **Table of contents** | ||
- | * Chapter 1: http:// | + | * Chapter 1: [[http:// |
- | * Chapter 2: http:// | + | * Chapter 2: [[http:// |
- | * Chapter 3: http:// | + | * Chapter 3: [[http:// |
- | * Chapter 4: http:// | + | * Chapter 4: [[http:// |
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**Abstract** | **Abstract** | ||
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If multiple salt scenarios lead to several possible velocity models being created, these models can be quickly tested by synthesizing new source and receiver wavefields from an initial image. Both wavefields are generated using prestack velocity information from the initial image, via a generalized form of Born modeling. This allows the velocity inaccuracies present in the initial model to be identified and, ideally, corrected in future model iterations. Because the synthesized receiver wavefield is imaged with an areal source function (both obtained with the initial velocity model), a single shot can be migrated using any other velocity model to provide an image of targeted locations within the model. Crosstalk issues arising from interfering events in the subsurface offset domain can be mitigated by imaging only sparsely-spaced model locations; alternatively, | If multiple salt scenarios lead to several possible velocity models being created, these models can be quickly tested by synthesizing new source and receiver wavefields from an initial image. Both wavefields are generated using prestack velocity information from the initial image, via a generalized form of Born modeling. This allows the velocity inaccuracies present in the initial model to be identified and, ideally, corrected in future model iterations. Because the synthesized receiver wavefield is imaged with an areal source function (both obtained with the initial velocity model), a single shot can be migrated using any other velocity model to provide an image of targeted locations within the model. Crosstalk issues arising from interfering events in the subsurface offset domain can be mitigated by imaging only sparsely-spaced model locations; alternatively, | ||
- | The image segmentation and model evaluation tools are designed to work together to alleviate the salt interpretation bottleneck in model building. Using a wide-azimuth survey from the Gulf of Mexico, image segmentation is used to isolate a sedimentary inclusion within a salt body, and to define two alternate interpretations of the base of salt. The efficient model evaluation scheme is then used to test these two models, along with one provided with the dataset, in a fraction of the time required for full migrations. Qualitative and quantitative analysis of the results | + | The image segmentation and model evaluation tools are designed to work together to alleviate the salt interpretation bottleneck in model building. Using a wide-azimuth survey from the Gulf of Mexico, image segmentation is used to isolate a sedimentary inclusion within a salt body, and to define two alternate interpretations of the base of salt. The efficient model evaluation scheme is then used to test these two models, along with one provided with the dataset, in a fraction of the time required for full migrations. Qualitative and quantitative analysis of the results |