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通过对临23块馆三段辫状河三角洲砂体的建筑结构要素分析表明,单砂层垂向细分应以沉积间歇面作为细分基础,以同一期沉积的砂层作为基本单元;且具有一定地层厚度,能作为基本储层单元。单砂层对比中要综合考虑沉积学、地层学及储层内部结构等多方面特征,合理选择等高程、切片、相控和叠置及下切砂体侧向连续等对比方法。由水下辫状河道剖析看出,砂体结构要素的展布影响了储层物性和剩余油分布,该方法对老区挖潜十分有效。
Through the analysis of the structural elements of braided river delta sand bodies in the third section of Provisional Hall of Building 23, it shows that the vertical subdivision of single sand layer should take the sedimentary intermittent surface as the subdivision foundation and the sand layer deposited in the same period as the basic unit. With a certain formation thickness, can be used as a basic reservoir unit. In the comparison of single sand layer, comprehensive consideration should be given to such aspects as sedimentology, stratigraphy and internal structure of reservoirs, etc., and reasonable selection such as elevation, slice, phase control, overlying and lateral continuous cutting sand body contrast method. It can be seen from the underwater braided river profile that the distribution of structural elements of sand body affects the physical properties of reservoirs and the distribution of remaining oil. This method is very effective in tapping potential in old areas.