Description: New One-step estimation of focusing operators for 3D seismic data by Maurice Van Rijzen The main subject of this thesis is the estimation of focusing operators, which are the kinematical part of the Green's function from reflector points in the subsurface, called focal points, to a grid of points located at the acquisition surface. This estimation process is data-driven and does not explicitly involve the estimation of a subsurface velocity model to arrive at a consistent set of operators between surface locations and locations along a horizon. The method is based on the concept that conventional migration can be decomposed into two separate backward propagation steps, where both the source and receivers are separately backward propagated using the focusing operators. Applying only one backward propagation step to the data using an estimate of the focusing operator, transforms the data to a domain that is very suitable for updating the focusing operators. In this new domain, called the Common Focal Point (CFP)-gather, "The principle of equal travel time" can be formulated. This principle states that in case the correct focusing operators has been used to create a CFP-gather, the focusing operators and the event in the CFP-gather corresponding to the image point should be kinematically the same, because they both describe one-way wave-propagation from the image point to points at the acquisition surface. The residual times observed between the target event in the CFP-gather and the focusing operator can be use to update the focusing operator. Traditionally an iterative method is used to estimate the focusing operators, which may give in complex situations ambiguous results. In this thesis a new focusing operator estimation procedure is presented. By taking into account the physical relationships between all focusing operators, a set of nonlinear equations can be formulated that relate the incorrect focusing operators, the correct focusing operators and the observed residual times. This set of equations is then used in an inversion procedure that yields the correct focusing operarotors in one step. The proposed method has been validated for several 2D datasets and a synthetic 3D dataset.
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Restocking Fee: No
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Item must be returned within: 30 Days
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PublishedOn: 2006
Book Title: Integrated Approach To 3D Seismic Acquisitions
Book Series: applied Physic
Item Length: 9.5”
Original Language: English
Vintage: No
Format: Paperback
Unit Type: Unit
Language: English
Item Height: .75
Personalized: No
Features: Illustrated
Unit Quantity: One
Topic: applied Physic
Item Width: 6.5”
Narrative Type: Nonfiction
Publisher: Delph University Pf Technology
Intended Audience: Adults
Edition: Professional Edition
Publication Year: 2007
Literary Movement: applied Physic
Era: 2000s
Author: Edith Van Veldhuizen
Genre: Technology, Applied Physics
Country/Region of Manufacture: Netherlands
Item Weight: 25 oz
Number of Pages: 160
