Forced Fluid Flow and Diagenesis in Porous Reservoirs—Controls on the Spatial Distribution
Published:January 01, 1985
J. R. Wood, T. A. Hewett, 1985. "Forced Fluid Flow and Diagenesis in Porous Reservoirs—Controls on the Spatial Distribution", Roles of Organic Matter in Sediment Diagenesis, Donald L. Gautier
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When pore fluids flow across isotherms and maintain chemical equilibrium with the mineral assemblage, a certain amount of matrix mass transfer must occur due to the temperature dependence of the equilibrium constants involved. The fluid flow field V interacts with the temperature field T to produce a spatially varying component of the total diagenetic field (the advective diagenetic field), which is proportional to V grad T where grad T is the gradient of the temperature field. The spatial distribution of the advective field depends on the geometry of the system (e.g., domes, anticlines, etc.) and to a first approximation is independent of the authigenetic mineral assemblage. The intensity of the alteration, or equivalently, the time required to reach a certain degree of alteration, is proportional to the permeability and thermal conductivities of the rocks involved. For cases when simple forced flow dominates, the alteration is relatively homogeneous vertically. The lateral variation, however, can be intricate, even for simple geometries, since the distribution of the altered assemblage is proportional to the directional derivative of the function(s) describing the structures.The porosity isopleths (points of equal porosity change) migrate through the rock, diverging from regions of net mass removal and converging on regions of net accumulation. The movement of these isopleths provides a sense of the net mass flows in the system.
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Roles of Organic Matter in Sediment Diagenesis
This volume is the direct result of an SEPM Research Conference held in October 1983 at Lost Valley Ranch, Colorado. The goal of the volume is to bring attention of the sedimentological community the importance of interaction of organic compounds with the inorganic sedimentary system and the degree to which organic compounds drive diagenetic systems. This volume comprises 16 reports illustrative of the scope and direction of current research in sedimentological and geochemical studies of organic/inorganic interaction.