应用地震解释技术识别湖底扇——以克拉玛依油田为例

Sublacustrine Fan Identification by Seismic Interpretation Technology——An example from Karamay oilfield

湖底扇已成为岩性油气藏勘探的重要领域。以克拉玛依油田中拐五-八区克81井东区二叠系下乌尔禾组湖底扇的识别为例,首先,建立湖底扇的地震识别模式,在深湖-半深湖亚相区域,根据地震反射波同相轴的外形反射特征及内部反射结构特征进行湖底扇的识别,再综合运用三维地震多属性分析、谱分解、层拉平等多种地震解释技术对预测的湖底扇加以佐证,并确定其平面的展布范围,从而验证了该方法的适用性。

Sublacustrine fan is a kind of deposit of gravity flow developed on slope of deep lake-bathyal subfacies area,which occurs widely in most of the continental sedimentary basins.In view of its distribution in group,it has become a major domain for petroleum exploration of lithologic reservoirs.Taking the sublacustrine fan of Lower Wuerhe formation of Permian in K-81 Well east area of Karamay oilfield as an example,this paper presents the seismic identification model for the sublacustrine in deep lake-bathyal subfacies area from the outside reflection feature and inner reflected structure of the seismic reflection event,integrated with seismic multi-attribute analysis,spectrum decomposition and layer flattening techniques for verification,and finally confirms its range in plane distribution.