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《Acta Scientiarum Naturalium Universitatis Pekinensis》 2012-03
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Magmatic Hydrothermal Fluids-Formation Water Compound System and Diagenetic Response of Carbonate Reservoir Rocks in Northern Tarim Basin

CUI Huan,GUAN Ping,JIAN Xing The Key Laboratory of Orogenic Belts and Crustal Evolution,School of Earth and Space Sciences,Peking University,Beijing 100871;  
Through the petrographic studies,it is found that the carbonate rocks in Northern Tarim Basin have developed a diagenetic paragenetic sequence of silicification → hydrothermal dolomitization → calcitization.Many lines of evidences,such as the quartz fluid inclusion with a high salinity and homogenization temperature,the positive Eu anomaly in REE pattern of the saddle dolomite,and the calculated δ18OSMOW(+5.5‰ – +12‰) of the fluid which precipitated the calcite crystals,all indicate that there exist magmatic hydrothermal fluids.It is also found that the hydrothermal diagenetic fluids have been mixed with organic carbon,meteoric water or the 87Sr rich formation water in different degree.The carbonate rocks in the research area have a corresponding diagenetic response to the "magmatic hydrothermal fluids-formation water compound fluid system".The magmatic hydrothermal fluids is an important source of Si and REE to the diagenetic fluid flow and is also a heat source that drives the magmatic hydrothermal fluids and formation water cycle underground.The acid dissolution mechanism indicates that the open fault area is a promising target for the petroleum reservoir exploration in the future.
【Fund】: 国家重大专项“大型油气田及煤层气开发”(2008ZX05008-003-031)资助
【CateGory Index】: P618.13
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