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马家沟组浅水碳酸盐沉积体系可分为滩相、开阔台地相、局限台地相和蒸发台地相四个相带;讨论了不同相带的有机质丰度、可溶有机质族组成及其生物标志化合物特征。研究表明,局限台地相有机质丰度相对较高,富含饱和烃和芳烃,正构烷烃轻组分含量相对较高;滩相有机质丰度相对较低,富含非烃和沥青质,正构烷烃重组分含量相对较高。不同相带的碳酸盐岩生烃潜力不同,局限台地相水动力条件较弱,处于还原沉积环境,有利于有机质保存,生烃潜力较高,是油气源岩良好的分布区;而滩相为颗粒灰岩,孔隙发育,非烃和沥青质所占比重较大,是良好的储集带。
The shallow-water carbonate sedimentary system of Majiagou Formation can be divided into four facies belts of facies facies, open platform facies, confined platform facies and evaporating platform facies. The abundances of organic matter, soluble organic matter and organic matter in different facies belts are discussed Logo compound characteristics. The results show that the abundance of organic matter in the confined platform is relatively high, which is rich in saturated and aromatic hydrocarbons, relatively high content of n-alkanes. The abundance of organic matter in the beach facies is relatively low, rich in non-hydrocarbon and asphaltene, Alkane heavy component content is relatively high. Carbonates in different facies have different potential for hydrocarbon generation. Hydrodynamic conditions of confined platform are weak, and are in a reducing sedimentary environment, which is favorable for the preservation of organic matter and high potential for hydrocarbon generation, which is a good distribution area for source rock. Particulate limestone, pore development, non-hydrocarbon and asphaltene accounted for a large proportion, is a good reservoir belt.