高邮凹陷邵伯地区近岸水下扇的地震预测

我国东部地区的许多断陷湖盆在中新生代处于扩张期，普遍发育近岸水下扇。水下扇一般沿大断裂下降盘展布，且多分布在湖盆陡坡的一侧。扇中砂岩因断层遮挡形成构造岩性复合型油气藏。苏北盆地高邮凹陷南部陡坡一侧，早期根据构造圈闭模式发现的真武、富民等油田，经进一步开发落实均为扇中砂岩与构造控制的复合型油气藏。如何利用地震技术预测扇体展布范围以及扇中砂岩发育区是南部陡坡带扇体勘探的关键。综合利用了多种地震解释手段，对高邮凹陷南部陡坡带邵伯工区近岸水下扇进行了预测，为勘探提供了依据，经钻探取得了较好的效果。

Seismic prediction of nearshore subaqueous fan in Shaobo, Gaoyou Depression

Many terrestrial rifted lake basins in east China were in its development stage in the Mesozoic or Cenozoic era,and nearshore subaqueous fans were well developed in the downthrown block of the faults.Most of the fans are developed in the steep slope of the rifted lake basin.Sands in the fan form structural-lithologic composite hydrocarbon reservoir because of fault sealing.Zhenwu and Fumin oilfield found according to the pattern of structural trap at the early stage are located in the south steep slope of Gaoyou depression,and they have been proved to be structural-lithologic composite oil reservoir in the later development.Therefore delineating subaqueous fan and the distribution of sand in the fan are vital for the further exploration in the south steep slope of Gaoyou depression.This paper discussed the prediction of nearshore subaqueous fans in the south steep slope of Gaoyou depression by seismic methods.The predicted results were confirmed by drilling.