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• W2094846095 abstract "The formation of clays and CO2 from silicate-carbonate reactions and the effect of these products on reservoir quality and fluid chemistry have been well recognized in the study of sediment diagenesis. The phase relationships for the reaction of kaolinite + dolomite + quartz to calcite + chlorite-smectite + CO2 reactions were chemographically examined and experimentally evaluated. The phase boundary of this reaction on a T−XCO2 diagram was interpolated between high temperature experimental data and low temperature field data. The results can be applied to predict the amounts, type and timing of clay and CO2 formation during sediment diagenesis. The variation of pore fluid composition (e.g. Ca2+ and Mg2+) caused by these reactions was also evaluated using a geochemical modeling program. The major conclusions and implications are the following: (1) the concentration of CO2 in the reaction fluid controls the reaction temperature as well as the clay type (chlorite vs smectite) formed. The equilibrium boundary provides a guideline for estimating the CO2 contents, the sealing integrity and temperatures of a diagenetic system based on the observed mineral assemblages; (2) the silicate-carbonate reactions can occur in diagenetic environments that are open to CO2, and can therefore, be an important inorganic source of CO2 which can lead to the formation of CO2-rich gas fields and secondary porosity. The diagenetic reactions, however, are significantly suppressed in a closed system (e.g. overpressure zone) and therefore cannot significantly contribute to overpressure formation nore generate enough pressure to create fractures; and (3) the formation of smectite of chlorite which can serve as a sink for Mg2+ and to a lesser extent, for Ca2+. The pore fluid released from these reactions during shale diagenesis, in general, contains much less Mg2+ than Ca2+. The reactions in shales are likely sources of Ca2+ for carbonate cements but not of Mg2+ for dolomitization." @default.
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• W2094846095 date "1994-09-01" @default.
• W2094846095 modified "2023-09-26" @default.
• W2094846095 title "Experimental studies of silicate-carbonate reactions—I. Applications to diagenesis" @default.
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• W2094846095 doi "https://doi.org/10.1016/0883-2927(94)90013-2" @default.
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