直接以油层顶面（或底面）为准绘制小等高线间距（1—5米）构造图，可显示出微型构造特征。
Such structural features can be identified by contouring directly on either top or bottom surface of the reservoir with a contour interval of 1-5m.
枕状构造是砂层中一组呈“凹”形弯曲的变形沉积体，它的原始层平行于枕状体的底面，顶面则是一个平直的截切面。
Pillow structure consists of a suit of deformed concave upward bodies made of silt and sand whose original layering bent round parallel the basal surface and it truncated at the top surface.
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