古龙页岩油勘探开发进展及发展对策

Exploration and development progress and development strategies of Gulong shale oil

古龙页岩油是继常规油之后最为现实的接替资源,目前已经成为大庆油田增储上产的主要领域。通过系统阐述古龙页岩油勘探开发历程和分区带落实资源潜力,为古龙页岩油未来发展制定合理规划。结果表明:古龙页岩油主要经历了勘探评价、先导试验和扩大试验3个勘探开发阶段;富有机质页岩具有面积广、厚度大、生油能力强等特点,页岩油富集的物质基础雄厚;古龙页岩油纵向上主要富集于下油组(Q_(1)―Q_(4)油层)和上油组的Q_(9)油层,平面上具有全盆地分布的特征,在古龙凹陷深凹区地质条件最为优越;按照轻质油带核心区―斜坡区―稀油带―低熟页岩油的规划,逐步对古龙页岩油实施勘探研究及开发动用;基于原生源储的富集规律,建立了原位成藏理论,古龙页岩油提交了12.68×10^(8)t的预测地质储量及2.04×10^(8)t的探明地质储量,指导了国家级示范区及全国重点实验室建设;应用体积法估算轻质油带Q9油层资源量为9.6×10^(8)t,轻质油带Q_(2)―Q_(8)油层整体资源量为38.8×10^(8)t,三肇地区稀油带资源量达11×10^(8)t以上,能够有效支撑古龙页岩油革命行动目标。通过加强理论研究,推动技术进步,推进管理创新,实现降本增效,古龙页岩油必将成为大庆油田资源接续和百年油田建设的重要领域。

Gulong shale oil is the most realistic replacement resource after conventional oil,and is a major field for increasing reserves and production in Daqing Oilfield.Future development of Gulong shale oil is reasonably designed through systematically describing its exploration and development history and zoning to determine resource potential.The results show that Gulong shale oil mainly experienced 3 stages of exploration and development,including exploration evaluation,pilot test and extended test.Gulong shale oil formed in fresh water-brackish water+weak provenance+strong reduction environment in warm and humid climate.Organic-rich shale has wide distribution area,large thickness and high oil generation capacity,providing sufficient material basis for shale oil enrichment.Gulong shale oil is mainly enriched vertically in Q_(1)−Q_(4) reservoirs of lower reservoir member and Q_(9) reservoir of upper reservoir member,and distributes areally in the whole basin,with the best geological condition in deep sag area of Gulong Sag.Exploration research and development of Gulong shale oil will be conducted step by step according to the planning of light oil core zone-slope zone-thin oil zone-low mature shale oil.In-situ accumulation theory is established based on enrichment law of primary reservoir in source strata,with 12.68×10^(8) t of possible reserves and 2.04×10^(8) t of proved reserves submitted,guiding the construction of national demonstration area and national key laboratory.Volumetric method estimated resources of Q_(9) reservoir in light oil zone is 9.6×10^(8) t,total resources of Q_(2)−Q_(8) reservoirs in light oil zone is 38.8×10^(8) t,and thin oil zone resources in Sanzhao area is>11×10^(8) t,which can effectively support the goal of Gulong shale oil revolution.By strengthening theoretical research,accelerating technical progress,promoting management innovation and realizing cost reduction and efficiency increase,Gulong shale oil will become an important field for resource continuation and centenary oilfield construction in Daqing Oilfield.