北二西东部萨Ⅱ组至葡Ⅱ组剩余油分布特征研究

发布时间：2018-05-15 03:12

本文选题：岩相 + 沉积微相　；参考：《东北石油大学》2017年硕士论文

【摘要】：大庆油田历经近60多年的生产开发,且早已进入了特高含水的开采阶段,该阶段中近70%的剩余储量主要分布于厚(较厚)油层的内部,更是维持4000万吨油气持续稳产的重要基础。油田虽然采取了二次加密、三次加密、层系调整以及三次采油等不同方法和措施,但通过密闭取心井的观察仍然存在大量的剩余油动用较差甚至未被动用。本文利用检查井岩心资料,详细总结研究区块沉积模式,绘制研究区沉积微相图,确定不同类型砂体单砂体分布特征,开展储层砂体内部的非均质性,进而研究高含水后期不同开发阶段不同类型砂体内部垂向、平面及岩心尺度剩余油分布特征。根据检查井组700余米的岩心精细描述成果,总结了不同河道类型的岩相特征,并提炼了研究区辫状河、曲流河、分流河道等河型的岩相组合模式。一类油层剩余油形成的主要因素为废弃河道遮挡、河间砂遮挡、河道边部岩心变差遮挡、侧积夹层遮挡。二类和三类油层剩余油形成的主要因素为薄注厚采、薄注-厚-薄采、厚注薄采、厚注-薄-厚采、沉积尖灭和沉积死角。最终针对各类储层剩余油分布情况,提出了补孔、改变渗流方向、缩小井距、水平井等挖潜措施。
[Abstract]:After more than 60 years of production and development, Daqing Oilfield has already entered the stage of extremely high water cut, in which nearly 70% of the remaining reserves are mainly distributed inside the thick (thick) reservoir. It is also an important basis for maintaining 40 million tons of oil and gas sustainable and stable production. Although different methods and measures have been adopted, such as secondary infill, triple infill, stratigraphic adjustment and tertiary oil recovery, there are still a large number of remaining oil produced poor or unexploited through the observation of closed coring wells. In this paper, the core data of inspection wells are used to summarize the sedimentary model of the study block in detail, to draw the sedimentary microfacies diagram of the study area, to determine the distribution characteristics of single sand bodies of different types of sand bodies, and to develop the heterogeneity within the reservoir sandbodies. The distribution characteristics of residual oil in vertical, plane and core scales of different types of sand in different development stages in the late stage of high water cut are studied. Based on the fine description of the core of a well group of over 700 meters, the lithofacies characteristics of different channel types are summarized, and the lithofacies combination models of braided river, meandering river and distributary channel in the study area are refined. The main factors of formation of residual oil in one kind of reservoir are abandoned channel blocking, interriver sand blocking, the core of river side becoming worse, and lateral intercalation blocking. The main factors of formation of remaining oil in the second and third types of reservoirs are thin injection-thick production, thin injection-thick-thin production, thick injection-thin-thick production, depositional pinning and depositional dead angle. Finally, according to the distribution of remaining oil in various reservoirs, some measures are put forward, such as filling hole, changing percolation direction, reducing well spacing, horizontal well and so on.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE327

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