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鄂尔多斯盆地延长组长7段致密油是我国陆相致密油的典型代表,在地质研究及试验攻关推动下,其勘探、开发取得了显著成效。地质上系统开展了包括精细刻画烃源岩时空展布、发展完善湖相重力流沉积模式、建立微(纳)米孔喉定量表征方法、实现致密储层裂缝定量预测、深化致密油充注成藏机理等方面的研究并取得创新认识;现场开展了致密油水平井体积压裂试验及致密油规模开发试验,建成了Z1、Z2等致密油水平井技术攻关示范区和A、Z、W等规模开发试验区,试验区单井产量获得巨大突破,资源实现有效动用;通过研究和攻关,研发集成了21项关键技术,落实了致密油规模储量,初步实现了致密油规模有效动用。文中还介绍了盆地致密油地质研究及现场试验攻关中遇到的困难和关键问题,重点阐述了解决问题的思路、方法及形成的经验,指出面对致密油等非常规地质对象,科学认清其本质属性,善于应用非常规技术和方法,以解决实践问题为研究出发点,采用多学科、一体化综合研究等是成功的关键。通过分析总结,为同类陆相盆地致密油理论技术研究及勘探开发实践提供了样本。
The tight oil in Chang 7 Member of Yanchang Formation in Ordos Basin is a typical representative of terrestrial tight oil in China. Under the promotion of geological research and experimental research, its exploration and development have achieved remarkable results. Geologically, the system has been carried out to finely depict the spatial and temporal distribution of source rock, develop and improve the sedimentary model of gravity flow in the lake facies, establish a quantitative method of micro (nano) pore throat, realize the quantitative prediction of the tight reservoir fractures and deepen the tight oil filling Reservoir mechanism and other aspects of innovation and made innovative understanding; the site of a tight oil horizontal well volume fracturing test and tight oil scale development test, built Z1, Z2 and other tight oil horizontal well technology research demonstration area and A, Z, W and other scale development Through the research and research, 21 key technologies have been researched and developed, the tight oil reserves have been implemented, and the effective use of tight oil scale has been basically achieved. The paper also introduces the difficulties and key problems encountered in the research of tight oil geology in the basin and the field test, and emphatically expounds the train of thought, method and experience of the problem solving. It points out that in the face of unconventional geological objects like tight oil, Its essential properties are good at applying unconventional techniques and methods to solve practical problems as the starting point for research, and adopting multidisciplinary and integrated research is the key to success. Through the analysis and summary, this paper provides a sample for the research on tight oil theory and exploration and development practice in the same continental basin.