THE IMPACT OF HYDROTHERMAL ACTIVITY ON THE RESERVOIRS IN THE EAST DEPRESSION OF THE NORTH YELLOW SEA BASIN
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摘要: 充分利用钻井岩心观察、薄片鉴定、扫描电镜和能谱分析等多种技术手段,分析了储层的岩石学特征,探讨了热液作用对储层的影响。研究认为,北黄海盆地东部坳陷中生界储层溶蚀缝洞大量充填与热液活动相关的自生矿物,热液作用对砂岩储层主要起破坏性作用。分析发现,北黄海盆地中生界具有热异常以及与岩浆作用有关的热力作用条件,发育与岩浆相关的热液活动地质背景;热液作用的发育纵向上具有层位性,主要位于上侏罗统顶部,平面分布则多与断裂发育有密切关系。Abstract: By full use of a variety of technical means such as drilling core observation, thin sections analysis, scanning electronic microscope and energy spectrum analysis, the article analyzed the petrological characteristics of the reservoirs in the East Depression of the North Yellow Sea Basin and discussed the impact of hydrothermal activity on the reservoir. The research suggests that the solution fissures in the reservoir in the Depression are filled with authigenous minerals related to hydrothermal activity that damages the sandstone reservoir. It is found that in the Mesozoic strata of the North Yellow Sea Basin, there were heat anomalies and hydrothermal activities related to magmatism, and existed the geological background of hydrothermal activity related to magmtism. The hydrothermal activities are found in different stages, mainly in the Late Jurassic. The hydrothermal activities usually have close relation with faults.
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