Abstract: Jiyang depression is a typical continental rift basin in eastern China, and develops multiple stages of source rocks, various types of reservoirs, and diverse types of traps, which is rich in conventional and unconventional oil and gas resources. It has entered a high-level prospecting stage after 60 years of exploration; it is more and more difficult to discover conventional oil and gas reservoirs in the middle and shallow layers; there is an urgent need to find new fields and new types of oil and gas exploration for replacement. Through systematically analyzing the geological conditions for hydrocarbon accumulation, recent exploration situation, and areas for increasing reserves, it is believed that Jiyang depression can provide the resource basis for its sustainable development; it is clarified that the conventional oil and gas in the middle-shallow layer, conventional oil and gas in the deep layer, shale oil, tight oil, and coalbed methane will become the main fields and types for stably increasing reserves in Jiyang depression. About 10×10⁸t of conventional oil and gas resources in the middle-shallow layers are yet to be discovered, demonstrating an important field for stably and continuously increasing reserves in the old well blocks. The resources in the deep conventional oil and gas field are predicted to be over 10×10⁸t, as being the key to expanding reserves. The in-place resources of shale oil exceed 100×10⁸t, and it is a practical field for achieving strategic replacement of resources; tight oil and coalbed methane are the fields supporting the strategic replacement of resources. This paper puts forward the next exploration direction of Jiyang depression by summarizing and analyzing the current exploration status and key issues, new understandings and progress in exploration, resource scale and exploration potential in various fields, providing reference for high-quality and sustainable exploration in continental rift basins of the eastern China.

Key words: Jiyang depression, deep oil and gas reservoirs, shale oil, tight oil, coalbed methane

摘要： 济阳坳陷是中国东部典型陆相断陷盆地,发育多期次烃源岩、多种类型储集层、多类型圈闭,常规和非常规油气资源丰富。经过60年勘探已进入高勘探程度阶段,中—浅层常规油气藏发现难度逐渐增大,亟需寻找油气勘探接替新领域、新类型。通过系统分析济阳坳陷油气成藏的地质条件以及近期勘探形势和增储领域,认为济阳坳陷具有可持续发展的资源基础,明确了中—浅层常规油气、深层常规油气、页岩油、致密油和煤层气五大领域是未来济阳坳陷稳定增储的主要领域、类型。其中,中—浅层常规油气待发现资源约10×10⁸t,是老区稳定持续增储的重要领域,深层常规油气领域预测资源量超过10×10⁸t,是拓展储量阵地的关键,页岩油原地资源量超过100×10⁸t,是实现资源战略接替的现实领域,致密油和煤层气是资源战略接替的后备阵地。通过梳理、分析各领域勘探现状及关键问题、新认识与勘探进展、资源规模和勘探潜力,提出了济阳坳陷下一步的勘探方向,从而为中国东部陆相断陷盆地高质量、可持续勘探提供借鉴。

关键词: 济阳坳陷, 深层油气藏, 页岩油, 致密油, 煤层气