【摘要】 渤海湾盆地南堡凹陷近年来油气勘探取得重大发现,已成为该盆地油气富集程度最高的富油气凹陷之一。研究发现:下第三系沙河街组特别是沙三4亚段发育高丰度的优质烃源岩,TOC高达5%以上,由于其形成于南堡凹陷主裂陷幕,此时湖盆水体最深,湖盆范围最广,发育大面积深湖相灰色、灰黑色泥岩、钙质泥岩、油页岩,且厚度大,平面上分布稳定,具有巨大的生烃潜力;沙三3亚段的暗色泥岩,生烃潜力较大。指出沙三段烃源岩是南堡凹陷最重要的烃源岩,其生烃量占南堡凹陷70%以上。沙一段烃源岩虽然没有东营组烃源岩厚度大,但是演化程度比东营组烃源岩高,二者生烃量比较接近,分别占南堡凹陷生油量的15%左右。更多还原

【Abstract】 In recent years,oil-gas exploitation has significant progress and Nanpu depression is found as one of the most oil-rich depressions in Bohai bay Basin.Through the exhaustive research,organic-rich source rocks are identified within Shahejie Formation（Es）,especially the TOC（total organic carbon）get the peak abundance in Es34 formation and values commonly exceed 5%.During the early Eocene period when major faulted depression movement occurred,lacustrine basin occupied the largest area and water depth arrived at the highest level in history;wide-spread gray,black mudstone,calcareous mudstone and oil shales prevailed over the stage,which were characteristic of magnificent thickness.The second important hydrocarbon source rocks are fine-grain dark mudstone which develop within Es33 formation.Generally,hydrocarbon source rocks verified in the Es³₃ member are responsible for the most of hydrocarbon generation that is estimated up to 70%.Although Es₁ member is not comparative with Dongying（Ed） formation in thickness,yet on account of the higher evolution degree,the two source rocks approximately provide nearly 15% oil production separately.更多还原