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处在构造边部、低部位的商５－５井，在改注水井排液中发现不含水的高产这种非常规现象，由此引起对地质因素的分析。浅湖相沉积的主体是滩砂微相，它可细分为“滩脊”和“滩侧”，其中“滩脊”砂体的泥质含量低，孔隙度、渗透率都较高，而“滩侧”则泥质含量高，物性差。在从“滩脊”砂体向“滩侧”过渡时，极易形成类似于砂体尖灭的岩性封堵，造成剩余油富集，而“滩脊”不一定就在构造的高部位。陆相沉积的砂体非均质性很强，孔隙度和渗透率在横向上的变化很大，高部位的油层水淹，低部位的油层不一定就高含水，这是因为砂体横向上的非均质性，使同一时间单元沉积的砂体很可能不连通。基于这些分析，地质工作者不妨运用沉积微相的原理在构造的低部位或边部寻找剩余油富集区，商５－５井的现实给了我们很好的启示。
In unconsolidated well 5-5 in the margin and low part of the structure, an unconventional phenomenon of non-water-rich high yield was found in the drainage of re-injection wells, which led to the analysis of geological factors. The main body of shallow lacustrine sediment is beach sand microfacies, which can be subdivided into “beach ridge” and “beach side”, in which “mudflat” sand body has low content of mudstone, high porosity and permeability, “Beach side” is a high clay content, poor physical properties. During the transition from “beach ridge” sand body to “beach side”, it is very easy to form a lithologic plugging similar to the pinnacle of the sand body, resulting in the enrichment of remaining oil. However, the “ridge of the beach” does not necessarily lie in the high part of the structure . The heterogeneity of terrestrial sedimentary sand bodies is very strong, the porosity and permeability vary greatly in the horizontal direction, and the oil layers in the upper part are flooded. The oil reservoirs in the lower part are not necessarily high in water content because the sand bodies are laterally Of the heterogeneity, so that the same time the unit sedimentary sand body is likely not connected. Based on these analyzes, geologists may wish to use the principle of sedimentary microfacies to find the remaining oil-rich areas in the lower part of the structure or in the margin. The well of Well 5-5 gave us good enlightenment.