Abstract:

Gu’nan is one of rich oil-gas subsags of Zhanhua depression. This paper, in order to clarify its exploration potential, analyzes the Tertiary sedimentary sequences characters, oil-formation parameters and reservoir-forming conditions, re-evaluates its resource. According to the hydrocarbon discharge and aggregate, Gu’nan subsag has a potential of 50-60 million tons. This paper discusses the sandstone body development and reservoir-forming conditions, presents that Gu’nan subsag has several reservoir-caprock combinations, excellent oil-gas transfer channel and traps, which form a special oil-gas rich zone, and determines the favorable target areas.

Key words: Gu’nan subsag, resources, hydrocarbon discharge, remaining reserve, exploration potential

摘要：

孤南洼陷是沾化凹陷油气最富集的洼陷之一，为了进一步探讨该区的勘探前景，通过对其第三系沉积特征、生油参数和成藏条件综合分析，重新评价了资源量。全区排烃量、聚集量统计结果表明，孤南洼陷还有5 000万～6 000万t剩余储量有待寻找，仍有较大的勘探潜力。文章还剖析了该区砂体发育及成藏条件，指出了孤南洼陷具有多套储盖组合、良好的油气运移通道及多类型的圈闭条件。这些条件的有机匹配形成了独特的三环式油气富集区带，并确定了有利的勘探区域。

关键词: 孤南洼陷, 资源量, 排烃, 剩余储量, 勘探潜力