--> ABSTRACT: Postdiagenetic Porosity Distribution: Coupled Flow/Reaction Modeling of Effects of Fluid and Rock Compositions, by Craig H. Moore; #91022 (1989)

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Postdiagenetic Porosity Distribution: Coupled Flow/Reaction Modeling of Effects of Fluid and Rock Compositions

Craig H. Moore

The distribution of porosity and permeability in a reservoir is a key factor of reservoir quality as is the composition of the minerals and fluids contained in the reservoir at the time of exploitation. The ability to study, via computer modeling and in a quantitative manner, the effects of diagenesis on these factors would be a useful adjunct to other tools for developing exploration strategies and maximizing success.

The computer code REACTRAN, a coupled flow/reaction, nonequilibrium code, has been used to quantitatively simulate, in one dimension, the flow of aqueous fluids of different compositions through arkoses of different compositions. The results of the simulations are depictions of the spatial and temporal evolution of porosity and permeability distributions, mineral composition and distribution, and fluid composition in the system. From permeability and porosity distributions one can make judgments regarding the likelihood of the development of diagenetic trap and reservoir geometries favorable to exploitation. Knowledge of the temporal evolution of trap and reservoir formation allows evaluation of favorable timing for migration and trapping sequences. Together, these observations lead t a cohesive and comprehensive view of basin evolution.

An important part of the modeling processes is to compare the predicted scenarios with those actually observed in the field. Several of the paragenetic sequences determined in the simulations are compared with observed sequences from their correlative formations in the Gulf Coast, the North Sea, and several North American basins.

AAPG Search and Discovery Article #91022©1989 AAPG Annual Convention, April 23-26, 1989, San Antonio, Texas.