HETEROGENEITY IN BRAIDED RIVER RESERVOIR AND ITS INFLUENCE ON REMAINING OIL DISTRIBUTION
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摘要:
辫状河油藏是我国主要油藏类型之一, 目前普遍进入高含水期, 层内非均质严重制约其高效开发. 本文以孔店油田馆陶组岩心、测井资料为基础, 结合生产开发数据, 分析了辫状河油藏层内非均质性及其对剩余油分布的影响. 结果表明: 研究区储层成因为辫状河道及心滩. 辫状河道为正韵律, 物性差异大, 夹层薄; 而心滩以复合正韵律为主, 物性差异中等偏强, 夹层厚. 由心滩对应的采油井夹层控制的剩余油较多, 垂积体的上部易形成剩余油富集区, 挖掘潜力大.
Abstract:As one of the major reservoir types in China, braided river reservoir has generally entered the high water-cut stage, and its efficient development is seriously restricted by the in-layer heterogeneity. Based on the core and well logging information of Guantao Formation in Kongdian Oilfield, the in-layer heterogeneity of braided river reservoir and its influence on remaining oil distribution are analyzed combined with the production and development data. The results show that the reservoir in the area is formed by braided channel and channel bar. The braided channel shows normal rhythm, with great physical difference and thin interlayer; while the channel bar is dominated by composite normal rhythm, with medium physical difference and thick interlayer. There is much remaining oil controlled by the interlayer of production well corresponding to channel bar. The remaining oil enriched area is easily formed in the upper interlayer of vertical deposit body, which has great developing potential.
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表 1 辫状河不同微相储层参数表
Table 1. Reservoir parameters for different microfacies of braided river
微相 砂体厚度/m 孔隙度/% 渗透率/10-3 μm2 突进系数 变异系数 河道 7.9 30.2 733 2.5 0.6 心滩 12 30.6 804 2.4 0.5 
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