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在分析地层、构造、沉积、储层及流体特征基础上,从不整合和断裂两方面对准噶尔盆地重32井区齐古组油藏主控因素进行分析。结果表明:齐古组油藏类型为发育在不整合半风化岩石带内的浅层地层-断块型超稠油油藏,成藏模式为侏罗纪末—白垩纪源外-不整合-断控次生油气藏成藏;不整合-断裂是油气运聚的主要运聚体系;白垩系/侏罗系不整合风化黏土层普遍发育,但其封盖能力差,是稠油形成的重要原因;多期构造运动及断裂-不整合复合输导体系是研究区齐古组稠油油藏形成的主控因素。
Based on the analysis of stratigraphic, structural, sedimentary, reservoir and fluid characteristics, the controlling factors of the Qigu Formation reservoir in the No.32 well block of Junggar Basin are analyzed from the aspects of unconformity and fracture. The results show that the reservoir type of Qigu Formation is a shallow stratum-fault block super-heavy oil reservoir developed in the unconformably semi-weathered lithosphere. The reservoir forming model is Jurassic-Cretaceous source-unconformity- The unconformity-fracture is the main migration and accumulation system of oil-gas migration and accumulation. The Cretaceous / Jurassic unconformably weathered clay layer generally develops but its sealing ability is poor, which is important for heavy oil formation The multi-period tectonic movement and fault-unconformity composite transport system is the main controlling factor for formation of Qigu Formation heavy oil reservoirs in the study area.