Abstract: The low-exploration fields including deep formation,deep water and new-exploration areas are important for petroleum exploration in future.The prediction of source rocks is critical for the preliminary evaluation of low-exploration fields.The source rocks of the northeast sag in Northern South Yellow Sea Basin were evaluated and predicted on the basis of well data from the adjacent homologous depression and the geological comparison principle by comprehensively using the geophysical method and basin modeling technique.The source rock of Taizhou Formation is the most important interval for hydrocarbon generation in the northeast sag of the Northern South Yellow Sea Basin.This formation is characterized with high abundance and fine type of organic matter,huge thickness and high maturity.Apparently the western sub-sag in the northeast sag is the most important hydrocarbon kitchen.A new evaluation system for source rocks was presented in low-exploration activity fields.The main formation of source rocks can be determined by the analogy analysis of seismic reflection characteristics and the quality of source rocks in adjacent homologous depression.The thickness of source rocks can be determined with seismic attribution method.The maturation of source rocks can be predicted with the basin modeling technique.The comprehensive evaluation of source rock can be used to select the optimum hydrocarbon-generation sag.

Key words: geological comparison principle, seismic attribution, low-exploration basin, source rock evaluation, Northern South Yellow Sea Basin, northeast sag

摘要： 低勘探程度领域(深层、深水和新区)是今后油气勘探的重要方向,而烃源岩的发育程度及其质量是该领域早期评价的核心问题。基于地质类比原理,综合运用地球物理及盆地模拟等方法技术,对南黄海北部盆地勘探新区——东北凹的烃源岩进行了早期预测及评价。结果表明,东北凹泰州组烃源岩分布广泛,有机质丰度高,有机质类型好,成熟度高,是凹陷主力烃源岩系,其中以西次洼生烃潜力最大。并在此基础上总结出了一套适用于低勘探程度领域烃源岩早期评价的方法体系,即类比分析地震反射特征及烃源岩质量确定主力烃源岩发育层位;利用地震属性方法确定烃源岩厚度;运用含油气盆地动态数值模拟确定烃源岩成熟度;烃源岩综合评价优选次洼。

关键词: 地质类比, 地震属性, 低勘探程度盆地, 烃源岩评价, 南黄海北部盆地, 东北凹