Stress-Induced Fluid Flow in Rifted Basins
Published:January 01, 1993
We present a model for sudden changes of fluid expulsion rates and overpressures in rifted sedimentary basins. The numerical model couples the stretching mechanism for rifted basin formation with fluid conservation and flow equations for compacting sediments.
Forces operating at plate boundaries exert stresses in the lithosphere, affecting the shape of basins and sedimentation rates. We demonstrate that these stresses affect the hydrodynamics of sedimentary basins, with possible implications for the diagenesis of sediments, faulting, and localization of economic resources. Increases in the level of compressive intraplate stresses induce flank uplift and increased subsidence in the basin center, thereby causing a contemporary basin- wide increase in compaction driven flow in the center and deeper penetration of meteoric water at the flanks of the basin. An increase in tensile intraplate stresses causes subsidence at the flanks of the basin and differential uplift in the basin center, which leads to a contemporary basin-wide decrease in compaction driven flow and reduced penetration of meteoric water.
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Diagenesis and Basin Development
This publication grew out of a conference of the same name held in 1991. Most, though not all, of the chapters included in the volume were presented at that conference. The purpose of the volume is to examine links between sediment diagenesis--and consequent porosity and permeability modification--and aspects of the development of sedimentary basins. The papers in the book provide some important guidelines and insights that may be useful to the exploration geologist in the development of new play concepts, and to the academician many stimulating ideas for further research.