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Title: (Derivation of) reflection/transmission coefficients for fluid-saturated poroelastic sediments
Author: Borocin, F.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2004
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The interpretation of reflection, transmission and conversion (RTC) coefficients in fluid-saturated porous rock is of utmost importance for the characterisation of hydrocarbon reservoirs. It has also been suggested that high-pressure pore-fluid is responsible for anomalously high (up to 0.15-0.25) values of reflection coefficients (deep crustal reflectors) in the lower crust, subduction zones and subglacial deforming sediments. In my thesis I consider the interaction of seismic waves at the interface between fluid-saturated poroelastic media, taking properly into account the effects of fluid-solid interaction. I derive dynamic equations for wave propagation in poro-elastic media and obtain an explicit wave decomposition in up- and down-going components. I then develop an algorithm to compute RTC coefficients at the interface between two arbitrary poro-elastic media, when possible pore-pressure discontinuity at the interface is taken into account. My algorithm is written in a matrix form allowing me to compute RTC coefficients for plane waves at all frequencies and all angles of incidence. This algorithm encompasses both visco-elastic and poro-elastic cases including the effects caused by partially sealed interface. Using numerical examples I show that my algorithm is consistent with (visco-)elastic case. It is designed in a matrix form suitable for conventional computations of multilayered stacks as used in the reflectivity method. A range of possible applications and extensions such as wave propagation in finely-layered fluid-saturated sediments are discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available