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新疆三塘湖盆地马朗凹陷牛圈湖构造带马25井石炭系火山岩储层中发现了原油和固体沥青共存,通过储层多级分离抽提和原油地球化学分析,并对这些原油(或固体沥青)的形成过程与其勘探意义进行了研究,结果表明这些原油和沥青可能主要来自下石炭统烃源岩,具有较低姥植比和伽玛蜡烷含量、高丰度三环萜、高Ts/Tm比值和重族组分碳同位素(δ13C>-28.0‰)特征;现今油藏原油富含生物降解标志物(25-降藿烷),同时却无明显其它生物降解特征(正构烷烃、甾藿烷等保存完整),反映多期充注特征,即二叠纪中晚期成藏后遭受生物降解,白垩纪后期又再次充注形成;下石炭系有效烃源岩的存在预示着本区具有深部下石炭统源岩贡献的油气藏勘探前景。
The coexistence of crude oil and solid bitumen was found in the Carboniferous volcanic reservoirs of Ma 25 well in Niuquanhu structural belt of Malu depression in the Santanghu Basin, Xinjiang. Through multi-stage separation and reservoir geochemical analysis of crude oil and crude oil (or Solid bitumen) and their exploration significance. The results show that these crude oils and bitumens may come from the Lower Carboniferous source rocks, which have a relatively low ratio of basal planting and gamma-alkanes, high-abundance tricyclic terpene, high Ts / Tm ratio and heavy carbon isotopic composition (δ13C> -28.0 ‰). Today’s crude oils are rich in biodegradable biomarkers (25-norhopane), but have no obvious biodegradation characteristics (n-alkanes , Complete with stannane, etc.), reflecting the characteristics of multi-phase filling, that is, they were biodegraded after the Middle Permian accumulation and re-filled during the Late Cretaceous. The existence of effective Lower Carboniferous source rocks indicates that this The area has the prospect of reservoirs contributing to the deep Lower Carboniferous source rocks.