【摘要】 南黄海盆地勿南沙隆起古生界地层的地热和地球化学异常一直受到众多地质学家和地球化学家的关注。本文联用显微测温和激光拉曼光谱技术对南黄海盆地勿南沙隆起的常州(CZ)-2-1井二叠系栖霞组灰岩石英脉中的流体包裹体进行了详细研究。根据岩石学特征、室温下包裹体相态特征和成分差别,这些包裹体可以分成三大类六小类。流体包裹体拉曼光谱分析结果表明包裹体中含有甲烷和有机物,证明了该区曾经有含烃类流体活动。显微测温分析表明流体包裹体的均一温度在214℃～305℃之间,远高于该区正常沉积的盆地古地温,暗示包裹体捕获了热液流体。根据岩石学观察和测温分析结果,样品中主要存在三期流体包裹体,其均一温度和流体的甲烷浓度分别为:214℃,0.1347mol/L;265℃,0.1722mol/L;305℃,0.3370mol/L。包裹体甲烷浓度随均一温度升高呈增大的趋势。本次研究证实南黄海盆地勿南沙隆起区曾存在含烃热液流体活动,这些实验结果可以为合理解释热异常和地球化学异常提供证据。更多还原

【Abstract】 The anomalies of geothermal and geochemical parameters of Palaeozoic formations at Wunansha uplift in South Yellow Sea Basin were concerned by many geologists and geochcmists.We have carefully studied the fluid inclusions hosted in quartz veins of Permian limestone from Qixia group in well CZ35-2-1 by combination of micro-thermometry and Raman spectroscopy in this paper.The fluid inclusions were divided into three types including six subtypes according to their petrological characteristics,phase state at room temperature and compositions.The results of Raman spectroscopy give strong information of methane and hydrocarbon in fluid inclusions.It powerfully proves that hydrocarbon bearing ever acted in researched area.The homogenization temperatures of fluid inclusions are much higher than the temperature of normal basin,which indicates that the hydrothermal fluids were trapped in fluid inclusions.There might be three times of activities of hydrocarbon bearing hydrothermal fluids which were distinguished by petrological characteristics and homogenization temperatures.The concentration of methane in the fluid inclusion increased with the homogenization temperature,from 0.1347mol/L at 214℃,0.1722mol/L at 265℃,to 0.3370mol/L at 304.5℃ respectively.The experimental results give reasonable explanation for the abnormality of heat and geochemical parameters in researched area.It means that all anomalies of geochemistry were caused by hydrocarbon bearing hydrothermal fluids.更多还原