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对塔北隆起中部27个原油样品进行了轻烃地球化学分析,结果表明这些不同区块、不同层位、不同产状原油C5—C7与C7轻烃组成非常接近,原油母质高度相似,均反映典型的海相成因、主要源自藻类和细菌等低等生物。轻烃2-MH/3-MH值和Pr/Ph值具有较好的正相关性,指示其沉积环境介质条件可能存在细微差异。庚烷值和异庚烷值分别介于22.97%~37.37%和1.04~4.06之间,原油生成温度为119.03~130.89℃,表明属于高成熟原油。混有早期生物降解原油的多期充注成藏,使得轻烃组成揭示的仅为晚期正常原油的地质地球化学信息。
The light hydrocarbon geochemical analysis of 27 hydrocarbon samples in the central part of Tabei uplift shows that the compositions of C5-C7 and C7 light hydrocarbons in these different blocks, different layers and different producing crude oils are very similar, and the crude parent metals are highly similar, both of which reflect The typical marine origin, mainly from lower organisms such as algae and bacteria. There is a good positive correlation between 2-MH / 3-MH value and Pr / Ph value of light hydrocarbon, indicating that there may be slight differences in the media conditions of depositional environment. Heptane and isoheptane values ranged from 22.97% to 37.37% and 1.04 to 4.06, respectively, and the crude oil formation temperature was 119.03 to 130.89 ° C, indicating that they are highly mature crude oils. The multi-phase charge-forming reservoir mixed with early biodegradable crude oil enables the light hydrocarbon composition to reveal only the geo-geochemical information of late normal crude oil.