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在塔中45井的萤石中发现两期烃包裹体:第Ⅰ期烃包裹体为产于萤石中的发黄色弱荧光的原生液相烃包裹体,沿萤石生长纹分布,与萤石同生;第Ⅱ期烃包裹体为产于萤石中的发蓝白色强荧光的次生气液相烃包裹体,分布在萤石的愈合缝中,晚于萤石形成。烃包裹体组分分析和赋存矿物测年结果表明,第Ⅰ期油来源于中上奥陶统,是一期成熟油的充注;第Ⅱ期油应形成于喜马拉雅期,主要来源于高成熟的寒武系烃源岩,是由寒武系原油裂解后再一次大规模轻质油侵入而形成的,第Ⅱ期是奥陶系萤石层段的油气藏主要成藏期。
Two phases of hydrocarbon inclusions were found in fluorite of Tazhong 45 well. The first phase of hydrocarbon inclusions is yellowish weak fluorescent primary hydrocarbon inclusions in fluorite. Along with the distribution of fluorite growth pattern, Shi Tongsheng. Phase II hydrocarbon inclusions are bluish-white, intense, fluorescent secondary gas-phase hydrocarbon inclusions in fluorite. They are distributed in the healing seam of fluorite and later than fluorite formation. The analysis of hydrocarbon inclusions and the mineral dating results show that the oil of the first stage originates from the middle-upper Ordovician, which is the filling of the mature oil of the first stage. The oil of the second stage should form in the Himalayan period and mainly come from the high The mature Cambrian source rocks are formed after another large-scale light oil intrusion after the cracking of Cambrian crude oil. The second stage is the major reservoir-forming period of the Ordovician fluorite layer.