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《Geochimica》 1993-04
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THERMODYNAMICS OF DIAGENETIC FLUID AND FLUID/MINERAL REACTION IN THE EOGENE XINCOUZUI FORMATION,OIL FIELD T,JIANGHAN BASIN

Ni Shijun (Institute of Geochemistry,Academia Sinica,Guiyang,550002)Luo Yutian Liu Lihua Wang Xuben (Chengdu College of Geology,Chengdu,610059)Li Sue Luo Yangdi Han Dingrong (Institute of Oil Exploration and Exploitation,Jianghan Oil Bureau,Qianjiang,433124)  
This study focusses on the thermodynamics of diagenetic fluid from the EogeneXingouzui Formation which represents the most important reservoir in field oil Tin the Jianghan Basin.The measured homogenization temperatures(110—139℃)offluid inclusions in diagenetic minerals fall within the range of 67—155℃ at themiddle diagenetic stage.The pressure of diagenetic fluid is estimated at 10.2—56MPa.The activity of ions in the fluid shows a tendency of Ca~(2+)Mg~(2+)Na~+K~+Fe~(3+)Fe~(2+) for cations,and HCO_3~-SO_4~(2-)F~-Cl~-CO_3~(2-)for anions.For the gaseous facies,there is a tendency of CO_2COH_2SCH_4H_2.Acco-rding to the thermodynamic calculations,the pH and Eh of the fluid are 5.86—6.47and—0.73V—0.64V,respectively.As a result of the interaction between such adiagenetic fluid and minerals in the sediments,feldspars were dissolved or alteratedby other minerals.The clay mineral kaolinite was instable and was replaced by illi-te and chloritoid.
【Fund】: 国家自然科学基金(49133080)资助
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