Abstract
ABSTRACTDiagenetic reactions, characterized by the dissolution and precipitation of minerals at low temperatures, control the quality of sedimentary rocks as hydrocarbon reservoirs. Geochemical modeling, a tool used to understand diagenetic processes, is performed through computer codes based on thermodynamic and kinetic parameters. In a comparative study, we reproduced the diagenetic reactions observed in Snorre Field reservoir sandstones, Norwegian North Sea. These reactions had been previously modeled in the literature using DISSOL-THERMAL code. In this study, we modeled the diagenetic reactions in the reservoirs using Geochemist's Workbench (GWB) and TOUGHREACT software, based on a convective-diffusive-reactive model and on the thermodynamic and kinetic parameters compiled for each reaction. TOUGHREACT and DISSOL-THERMAL modeling showed dissolution of quartz, K-feldspar and plagioclase in a similar temperature range from 25 to 80°C. In contrast, GWB modeling showed dissolution of albite, plagioclase and illite, as well as precipitation of quartz, K-feldspar and kaolinite in the same temperature range. The modeling generated by the different software for temperatures of 100, 120 and 140°C showed similarly the dissolution of quartz, K-feldspar, plagioclase and kaolinite, but differed in the precipitation of albite and illite. At temperatures of 150 and 160°C, GWB and TOUGHREACT produced different results from the DISSOL-THERMAL, except for the dissolution of quartz, plagioclase and kaolinite. The comparative study allows choosing the numerical modeling software whose results are closer to the diagenetic reactions observed in the petrographic analysis of the modeled reservoirs.
Highlights
Petroleum systems are dynamic physical-chemical environments of generation, migration and storage of oil
100°C, we observed similar behavior in Geochemist’s Workbench (GWB) and TOUGHREACT modeling due to the high kinetics and thermodynamics involved in diagenetic reactions, favoring the polynomial equations used by simulators
The present study of geochemical modeling comparing the application of GWB, TOUGHREACT and DISSOL-THERMAL codes for the simulation of diagenetic reactions observed in the Snorre Field reservoir sandstones, Norwegian North Sea, resulted in the following conclusions: 1. Diagenetic modeling at low temperatures (25 to 80°C) with different simulators reproduce quite different behaviors
Summary
Petroleum systems are dynamic physical-chemical environments of generation, migration and storage of oil. The oil migrates to a porous lithology that will store it (the reservoir rock), where it is trapped by another rock that has low permeability (the seal) (Magoon & Dow 1994; Gluyas & Swarbrick 2004). The reservoirs are normally carbonate rocks (Roehl & Choquette 1985) or siliciclastic rocks (Barwis et al 1990), formed as the result of several transformations that occur in the deposited sediments, via modification of the original texture, composition and, in the porosity.
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