Abstract: Jiyang depression is a typical continental faulted basin in eastern China, of which the Cenozoic Paleogene Shahejie Formation deposited a thick set of shale with low-medium maturity. Whether the shale oil can be effectively produced is crucial for understanding the potential of similar types of shale oil. The paper systematically studies and evaluates the lithologies, reservoir capabilities, and oil-bearing properties of more than 50 cored wells, and compares the differences in shale oil characteristics between different basins. The results indicate that the saline lacustrine basin of shale oil in Jiyang depression has a high carbonate content; various scales of fractures are developed in faulted basins; the reservoir space is dominated by inorganic pores and fractures due to a low degree of thermal evolution; the reservoir properties are good, and the flow capacity of crude oil is poor. Based on the geological characteristics of shale oil in Jiyang depression, this paper proposes a stereoscopic development technology focusing on the comprehensive stereoscopic evaluation of sweet spots, stereoscopic well pattern optimization design, stereoscopic fracturing optimization design, as well as the whole process optimization and control. Moreover, three stereoscopic development models have been established, including synchronous production of integral fracturing, step-by-step production by fracturing in batches, and stereoscopic scrolling development. Breakthroughs have been achieved in the pilot test of the field, confirming the broad development potential of shale oil with low-medium maturity.

Key words: low-medium maturity, shale oil, stereoscopic development, Jiyang depression, continental faulted basin

摘要： 济阳坳陷是中国东部陆相断陷盆地的典型代表,新生界古近系沙河街组沉积一套巨厚的中—低成熟度页岩,能否有效开发动用其页岩油对于认识同类型页岩油潜力意义重大。通过50余口取心井系统的岩相、储集性及含油性研究与评价,对比国内外不同盆地页岩油特征差异发现,济阳页岩油咸化湖盆碳酸盐含量高,断陷盆地发育不同尺度裂缝,演化程度低导致储集空间以无机孔-缝为主,储集物性好但原油流动能力差。依据济阳页岩油地质特点,提出了以甜点立体综合评价、立体井网优化设计、立体压裂优化设计、全过程实施优化调控为核心的立体开发技术,建立了整体压裂同步投产、分批压裂逐步投产、立体滚动开发3种立体开发模式,矿场先导试验取得了突破,证实了中—低成熟度页岩油具有广阔的开发潜力。

关键词: 中—低成熟度, 页岩油, 立体开发, 济阳坳陷, 陆相断陷盆地