In this thesis, I propose the following: - The P and S-wave velocities can provide a suitable link between reservoir parameters and rock properties using core, log and seismic data. - The pore aspect ratios as key parameters of rock geometry can be used to explain the different responses of elastic properties in clay-sand rocks (especially for thin and varying lithology formations). The use of fixed aspect ratio for physical velocity models will result in obvious errors in the prediction of elastic moduli and velocities (in particular for formations at shallow depth, or in loose and thin layers). - The time-average equation (Wyllie et al., 1956) ignored the effects of pore geometry, degree of consolidation fluid and clay content. It results in a hidden defect in the transformation between porosity (form core and well-log) and velocity (from seismic) when the rock contains clay. - The current models of Gassmann (1951), Kuster & Toksöz (1974) and Xu-White (1995) have some difficulties in calculating elastic moduli for rocks containing aligned pores and minerals in anisotropic formations. To investigate these, I first use method of multiple regression and artificial networks to establish an empirical correlation between reservoir parameters and P and S-wave velocities. This correlation includes porosity, clay content, aspect ratio and velocities, which can be used as an extension of the empirical model of Han et al (1956). Second, in order to overcome the weakness of empirical models, physically realistic theoretical models are established. The first theoretical model is the isotropic dual porosity model (IDP). The aim of the IDP is to develop a general rock physical model that provides a satisfactory integrated approach to the evaluation and prediction of reservoir parameters and rock properties for the purpose of reservoir characterization. Third, because the IDP model does not consider the effects of pore orientation, clay content and velocity anisotropy etc., a refined anisotropic dual porosity model (ADP) is then developed for anisotropic porous media.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:664094 |
| Date | January 2003 |
| Creators | Yan, Jun |
| Publisher | University of Edinburgh |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/1842/11633 |
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