Abstract
Presented in this paper are the types, salinities, homogenization temperatures and organic components of fluid inclusions formed at the four stages of diagenetic authigenesis in the Eogene of the Biyang Depression. The results of cooling experiments on fluid inclusions were used to determine the fluid system and composition of saline aqueous solution in each of the stages. The homogenization temperatures of saline aqueous solution inclusions and hydrocarbon organic inclusions have been corrected by two approaches, and the trapping temperatures and pressures of fluid inclusions at each of the stages have been obtained. This study has shed light on the physicochemistry and evolution of diagenetic fluids. The diagenetic fluid system is a system which was transformed from a chloride-bearing to a carbonate-bearing system along with the diagenic evolution. The decrease of diagenetic temperature at Stage III of diagenetic authigenesis suggests that the depression would have experienced uplifting at that time. The fluorescent characteristics of fluid inclusions indicate the varieties of organic components in fluid inclusions both in time and in space.
Published Version
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