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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Characterisation of salt diapir flanks constrained by field data

Vargas Meleza, Liliana January 2014 (has links)
Marginal zones of salt diapirs and canopies are complex geological environments, with rapid spatial variations in lithology, strain, and fluid-assisted alteration. These complex zones can contain economically attractive hydrocarbon accumulations. However, they are difficult to image seismically due to the irregular geometry of salt bodies and the large property contrast between salt and the surrounding sediments. I present an integrated and multiscale approach to build realistic models of salt margins that represent the geological heterogeneity and seismic anisotropy in such complex zones. Structural field data and petrophysical measurements are used to constrain such models. A suite of evaporite samples of various compositions are used to predict the seismic anisotropy from their crystal preferred orientations (CPOs) and elastic properties. Ultrasonic seismic velocities are measured to calculate the relative contribution of the shape preferred orientations to the seismic anisotropy of such samples. Calculation of the seismic anisotropy produced by thinly interlayered evaporites provides a link between small-scale compositional heterogeneity with large-scale seismic anisotropy. Integration of outcrop structural models, petrophysical measurements and the characterisation of seismic anisotropy of salt is possible through seismic modelling. My results suggest that the seismic anisotropy of these samples is strongly controlled by their CPOs, which ranges from 3 to 7% for halite, from 8 to 10% for anhydrite, and from 13 to 22% for gypsum. Predictions indicate that the contribution of a small amount (< 10 %) of anhydrite can moderately alter the seismic anisotropy of polycrystalline evaporite. A small amount of anhydrite interlayered with halite yields anisotropy parameters with magnitudes of = −0.014, = −0.044, and = −0.193, which agree with those parameters calculated for polycrystalline salt. Such calculations of seismic anisotropy at grain scale enable the study of the propagation of seismic waves through salt margins. Seismic images generated from outcrop models of salt diapir flanks show moderate image degradation if anisotropy of salt is neglected during seismic migration. This methodology provides a foundation for the characterisation of seismic anisotropy of salt with which models of salt margins can be improved.
12

Development of a high-resolution shallow seismic reflection system

Ali, Ja'afar W. January 1990 (has links)
No description available.
13

Numerical modeling of time-lapse seismic experiments to monitor CO₂ sequestration in a layered basalt reservoir /

Khatiwada, Murari, January 2009 (has links)
Thesis (M.S.)--Boise State University, 2009. / Includes abstract. Includes bibliographical references (leaves 85-90).
14

A discreet-scatterer model of the seismic P coda

Craig, Mitchell Scott 05 1900 (has links)
No description available.
15

An imaging hierarchy for common-angle plane wave seismograms /

Whitmore, Norman Daniel. January 1995 (has links)
Thesis (Ph.D)--University of Tulsa, 1995. / Includes bibliographical references (leaves 107-110).
16

Prediction of seismic parameters from primary and multiple reflections /

Chang, Hui, January 2008 (has links)
Thesis (Ph.D.)--University of Texas at Dallas, 2008. / Includes vita. Includes bibliographical references (leaves 99-102)
17

Numerical modeling of time-lapse seismic experiments to monitor CO₂ sequestration in a layered basalt reservoir

Khatiwada, Murari, January 2009 (has links)
Thesis (M.S.)--Boise State University, 2009. / Title from t.p. of PDF file (viewed Apr. 22, 2010). Includes abstract. Includes bibliographical references (leaves 85-90).
18

Structure under the mid-continent gravity high

Korompai, Americo E. January 1969 (has links)
Thesis (M.S.)--University of Wisconsin, 1969. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 40-43).
19

Spectral decomposition of outcrop-based synthetic seismic data, applied to reservoir prediction in deep-water settings

Zhang, Hongjie January 2014 (has links)
No description available.
20

Subduction dynamics at the middle America trench : new constraints from swath bathymetry, multichannel seismic data, and ¹⁰Be /

Kelly, Robyn K. January 1900 (has links)
Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and the Woods Hole Oceanographic Institution), September 2003. / Includes bibliographical references.

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