DISTRIBUTION PATTERN OF FLUVIAL RESERVOIRS IN QINHUANGDAO A OIL FIELD
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摘要:
秦皇岛A油田位于渤海中部海域，区内油气藏主要发育在新近系的明化镇组。明化镇组下段为曲流河沉积地层，具有很强的非均质性，使得注水开发收效不均匀，平面矛盾突出。选取Ⅲ2砂体为研究对象，利用40余口钻井资料和覆盖油田的三维地震资料对储层内部结构和平面展布特征进行了系统的分析。研究认为，Ⅲ2砂体是由两期点坝砂体叠置而成，每一期砂体在平面上由4~5个单一点坝顺向组合而成，点坝之间的溢岸沉积是导致储层非均质性强的主要因素，控制了剩余油的分布。油田的生产动态证实，注入水流动规律与点坝砂体的平面展布具有良好的对应关系，部分井区水驱效果不均衡，个别单井产能低下都能从中找到原因。
Abstract:The Qinhuangdao A Oil Field located in the center of Bohai Bay, is an oil field with the Minghuazhen Formation as the main reservoir. The lower member of the Minghuazhen Formation is dominated by a meandering river system. The deposits of the system are strongly heterogeneous, that may cause uneven water displacement. This paper systematically analyzed the texture of the sand body Ⅲ2 and ifs distribution pattern with the data from 40 wells and the 3-D seismic data covering the whole oilfield. Deposits of two point bars have been recognized so far, of which each consists of 4~5 single bars. The fine deposits between point bars make the reservoirs strongly heterogeneous and dominates the distribution of remaining oil. According to the latest production performance, there is close relationship between the injection water flow and the distribution pattern of sediments. The one-way flow of injected water and the low productivity of some wells are probably caused by the heterogeneity of the fluvial deposits.
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Key words:
- offshore oil field /
- fluvial facies /
- heterogeneity /
- boundary of sand body
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表 1 高弯度曲流河点坝规模经验值
Table 1. Geometrical parameters of single point bar of meandering river
河流满岸深度/m 4 5 6 7 8 9 河流满岸宽度/m 57.5 81.3 107.2 134.9 166.0 199.5 点坝长度/m 24 309 570 713 941 1 080 
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