Digital Simulation of Compaction in Sedimentary Sequences
Chia, Yee Ping
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https://hdl.handle.net/2142/68059
Description
Title
Digital Simulation of Compaction in Sedimentary Sequences
Author(s)
Chia, Yee Ping
Issue Date
1980
Department of Study
Geology
Discipline
Geology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Hydrology
Language
eng
Abstract
A compaction model which incorporates energy transport with fluid flow to investigate the role of three-dimensional loading and thermal expansion of fluid in generating the excess pore pressure in nonhomogeneous sedimentary sequences is developed. In this model, physical properties of fluid and sediments are considered to vary with temperature and pressure. The Crank-Nicolson finite difference method is used to solve the partial differential equations of fluid flow and energy transport. Distributions of excess pressure and temperature are analyzed for several cases: shales, alternating layers of shale and sandstone, post-deposition condition, drained sandstone and Gulf of Mexico. Sensitivity tests are made in order to satisfy the cases with different parameters.
Analysis shows that thermal expansion of fluid is one of the sole mechanisms for generating the excess pore pressure, particularly in the rocks with high bulk modulus. Stress distribution in sediments indicates that shear fractures may occur naturally in weak rocks such as shales. In addition, the excess pressure distribution in alternating layers of sandstones and shales reinforces the importance of hydrodynamic pressure gradient as a driving force of hydrocarbon migration.
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