中文摘要：

随着勘探程度的提高，深部石油天然气勘探在我国将越来越重要。我国碳酸盐岩地层分布广，埋藏深，其生烃评价是深部石油天然气勘探不可回避的问题。针对我国科学家在这一问题上的争论，提出了海相碳酸盐岩烃源岩评价的三个下限标准，即最低烃源岩的有机碳下限、有效烃源岩有机碳下限和形成大规模油气田的烃源岩有机碳下限。认为以往的争论是最低烃源岩、有效烃源岩下限的争论。通过文献整理、实验研究和计算，认为海相碳酸盐岩普遍存在的Ⅱ型有机质，其最低、有效油源岩的下限值可能在0．1％和0．4％左右，最低、有效气源岩下限可能在0．1％和0．3％左右，大规模油气田形成的TOC应在1％以上。

英文摘要：

As increasing activities of petroleum exploration in China, more attention is being paid to the deep oil and gas. The carbonate rocks in China are wide spread and often occur in deep of basin. Whether carbonate rock is source rocks is an essential question for the explorationist to answer. In the present paper, we propose three low limits of organic carbon content to identify and characterize the carbonate source rock. They are the lowest limit, effective limit and limit for formation of large scale of oil and gas field. It is found that the debate around carbonate source rock in the past three decades was between the lowest and effective limit. The lowest and effective limit for oil formation in type II carbonate source rock are 0. 1% and 0. 4% while the lowest and effective limit for gas formation in type II carbonate source rock are 0. 1% and 0.3% respectively. The limit for formation of large scale of oil and gas field is above 1%.