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在内蒙古二连的阿北地区发现一套砾岩储层,以“侵蚀、尖灭”方式覆盖在该区的玄武岩储层之上。在砾岩集中段,电阻率曲线均为高阻,自然电位曲线呈现明显的负值。砾岩储层的顶、底界面都形成较强的、连续的反射波,砾岩段内部是无反射的空白区。在砾岩体主体部位,反射外形呈迭瓦结构。迭瓦结构的下倾方向指示水流方向。砾岩层的层速度为2,700—2,900米/秒,在纵、横向上都有明显的变化,表明砾岩存在相变。目前在该区已发现几处油田,油层位于侵蚀面之下,含油面积受侵蚀面控制。可见,阿北地区可能是一个侵蚀不整合含油气区。
A series of conglomerate reservoirs were found in the northern part of Erlian, Erlian, Inner Mongolia, covering the basalt reservoir in this area by means of “erosion and pinchout”. In the conglomerate conglomerate, the resistivity curves are high resistance, and the natural potential curve shows a significant negative value. The top and bottom interfaces of conglomerate reservoirs form strong and continuous reflected waves, and the interior of conglomerate sections are blank areas without reflection. In the main body of conglomerate body, the reflection shape is a laminated structure. The pouring direction of the tile structure indicates the direction of water flow. The layer velocity of conglomerate layer is 2,700-2,900 m / s, which shows obvious changes both in vertical and horizontal direction, indicating the existence of phase transition in conglomerate. At present, several oil fields have been found in this area. The oil layer is located under the erosion surface and the oil-bearing area is controlled by the erosion surface. Can be seen, northern region may be an erosion of unconformity with oil and gas areas.