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Late Yanshan-Himalayan hydrocarbon reservoir adjustment and hydrothermal fluid activity in the central Tarim Basin

Science Bulletin 2007年第S1期 244-252页

作者： ZHANG XingYang1,2, ZHANG ShuiChang1, LUO Ping1,2, ZHU RuKai1,2, LUO Zhong1,2 & TU JianQi1 1 Central Laboratory of Petroleum Geology Research, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 2 Key Laboratory for Oil and Gas Reservoir, PetroChina, Beijing 100083, China

The adjustment of primary hydrocarbon reservoirs in marine formations is an important feature of the oil pools in the Tarim Basin. Large-scale hydrocarbon adjustment is related to the strong regional tectonic movements, which is always accompanied by extensive migration of basin fluids including diagenetic and mineralizing fluids. Organic fluid inclusions are well developed in hydrothermal minerals, such as fluorite, which have been found in the dissolution-enlarged fractures or karstification caves in the Ordovician in the central Tarim Basin. Proved by well drilling, the fluorite deposit is good reservoir for oil and gas. So the peculiar accompanied or superimposed relationship between fluorite hydrothermal fluid mineralization and hydrocarbon migration and accumulation exists in the Ordovician in the central Tarim Basin. Considering regional tectonic setting and mineralization condition, through different kinds of analytic methods including electron spin resonance dating, fluid inclusion laser Raman and colonial inclusions hydrocarbon fossil analysis, we proposed that extensive mineralizing fluids and hydrocarbon migration occurred in late Yanshan-Himalayan (110.4―30.8 Ma) period, and Himalayan, especially, is an important period for hydrocarbon accumulation from 34.3 Ma to present.

关键词： hydrocarbon adjustment hydrothermal fluid activity basin fluids Himalayan period Tarim Basin

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