海上油田受地理位置限制，井距一般较大，利用现行的针对密井网区的多井模式拟合方法难以有效表征分布规模较小的单一河口坝内部增生体。为此，利用渤海X油田大量水平井资料，开展了基于水平井资料的单一河口坝内部增生体识别。研究表明，水平井水平段垂向上在单一河口坝内部钻进，其横向钻进直接钻遇河口坝内部增生体，通过统计其钻遇的侧积夹层及叠置界面，得到研究区侧积夹层分布规模统计值，进而指导单一河口坝内部增生体识别。将该方法应用于渤海X油田，统计表明，水平井水平段普遍在240∼320 m，井间发育3∼6期侧积夹层（叠置面）。该方法不仅对缺少小井距及岩芯资料的海上油田具有实用价值，对相似油田的小级别构型单元识别也具有参考价值。%A distant well spacing is often allocated for offshore oilfield due to the geographical restrictions. Consequently, the characterization of such underground reservoir structures with the current overlay method for multi-well models used mainly under dense-well pattern conditions usually achieves a poor precision. Therefore, based on a large number of horizontal well data of X Oilfield in Bohai Bay, we did the research on characterizing such debouch bar reservoir structures:Horizontal section which is always drilled in the inner debouch bar can meet the debouch bar accretion sand bodies when drilled laterally. So, we used the scale statistic data of the drilled accretion sand bodies to guide the characterization of accretion sand bodies. With using the method in X Oilfield in Bohai Bay, it shows that the length of horizontal interval is always between 240–320 m, and there are 3–6 stages of lateral accretion interbed (overlay surface). This study has not only a significantly economic value in efficiently developing reservoirs of offshore oilfield where there is a lack of multi-well models data and test data, but also guiding significance for similar onshore oilfields in characterizing lower level structure elements.
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