苏北盆地中—古生界海相烃源岩发育规律及其意义

Development and significance of Mesozoic--Paleozoic marine hydrocarbon source rocks in Subei Basin

苏北盆地与南黄海盆地属于同一构造单元,苏北盆地的烃源岩发育规律的研究对南黄海油气勘探具有重要启示意义。在野外地质研究和69个烃源岩实测数据的基础上,结合已有分析化验数据及油气勘探资料,对苏北盆地的中—古生界海相烃源岩厚度分布和地球化学特征进行了分析,结果表明烃源岩整体沿北东向展布,在中—古生界均存在多个烃源岩发育中心,并明显有向南黄海海域延伸的趋势;下古生界普遍比上古生界的热演化程度高,并具有区域不均一性,二叠系的热演化程度相对较低,存在二次生烃的潜力。苏北盆地在中—古生界海相地层烃源岩特征的研究,进一步揭示了南黄海盆地具有良好的油气勘探潜力。

The Subei Basin and South Yellow Sea Basin belong to the same tectonic unit.The study on the hydrocarbon source rock＇s development regulation in Subei Basin is important for the Yellow Sea oil-gas exploration.Based on field geological research and actual measurement data of 69 hydrocarbon source rocks,combining the data of analytical test and oil-gas exploration,we analyzed the Mesozoic-Paleozoic marine hydrocarbon source rocks in thickness,distribution and geochemical characteristics in Subei Basin.The results show that the hydrocarbon source rocks in whole is along the NE trend in extension.In the Mesozoic-Paleozoic,exists several hydrocarbon source rock developmental centers,and obviously has extension trend along the South Yellow Sea area.The thermal evolutionary degree of Lower Paleozoic is higher in general than the Upper Paleozoic,and has regional heterogeneity.The thermal evolutionary degree of Permian is relatively lower,and has secondary hydrocarbon generation potential.The study on the characteristics of hydrocarbon source rocks from the Mesozoic-Paleozoic marine strata in Subei Basin further reveals that the South Yellow Sea Basin has good oil-gas exploration potential.