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由于砂砾岩体储层的岩性结构、含油性和非均匀性等特征极为复杂,在勘探试油中还存在一些技术难题未解决,尤其是在储层潜力评价方面存在较大偏差。统计分析了东营凹陷北带沙四段砂砾岩体储层的酸化和压裂效果,总体上压裂效果比酸化效果好。通过典型井例分析,揭示了砂砾岩体储层横向有效渗透率变化的复杂性,阐明了压裂后增产的主要因素。提出了砂砾岩体储层改造的选井选层原则,并进行了实际应用,取得较好的增产效果,为该类储层的下步挖潜进行了有益的探索。
Due to the complexity of lithology structure, oiliness and inhomogeneity of glutenite reservoirs, some technical problems remain unexplored in exploration and test oil reservoirs, especially in reservoir potential assessment. The acidizing and fracturing effects of the sand-conglomerate reservoir in the fourth member of the northern part of Dongying Depression are statistically analyzed. Generally speaking, the fracturing effect is better than the acidification effect. Through the analysis of typical well cases, the complexity of horizontal effective permeability change of sandstone-conglomerate reservoir is revealed, and the main factors for increasing yield after fracturing are expounded. This paper puts forward the principle of well selection and layer selection for the reservoir modification of glutenite body, applies it in practice and achieves better stimulation effect, which makes a useful exploration for potential tapping potential of such reservoirs.