天然气地球科学 ›› 2021, Vol. 32 ›› Issue (6): 836844.doi: 10.11764/j.issn.1672-1926.2021.02.012
摘要:
鄂尔多斯盆地长7段页岩油主要发育陆相半深湖—深湖重力流沉积,具有单砂体厚度薄、横向连续性差、非均质性强、储层致密、地层压力系数低等特征,与北美海相页岩层系相比,具有独特性,开发难度更大,陆相页岩油能否成为保障国家能源安全的重大接替领域,成为关注的重点。经过多年的攻关研究与现场实践,基于鄂尔多斯盆地长7段页岩油强非均质、低压等的独特性,提出了长7段页岩油“体积开发”理论,通过页岩油水平井多段压裂形成复杂缝网系统,形成了多尺度人工裂缝与基质间的非线性渗流和渗吸置换的复合渗流模式,大幅度改善了储层流体渗流环境,构建了“人工油气藏”;以“体积开发”理论为基础,创立了以“长水平井、小井距、大井丛、立体式、细分切割体积压裂”为核心的体积开发关键技术,使长7段页岩油得到商业化开发,快速建成了年产量达100×104 t的页岩油开发示范区,对国内陆相页岩油气资源的整体动用,能够提供较好的理论依据和技术支撑,起到了引领示范作用。
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