涠西南凹陷流一段沉积相研究及岩性地层圈闭识别

Research on sedimentary facies on the first member of Liushagang formation in Weixinan depression and lithologic-stratigraphic traps identification

通过建立涠西南凹陷流一段层序地层格架,明确了沉积体系及沉积相在等时地层格架内的空间展布特征,指出1号断裂带下降盘北物源浊积扇沉积体系、2号断裂带长轴西物源浊积扇沉积体系、涠洲6-B构造附近滨浅湖滩坝沉积体系和南部物源浊积扇沉积体系为涠西南凹陷流一段岩性地层圈闭的有利勘探方向。综合应用地震相分析、地震属性分析及高分辨率地震反演技术进行岩性地层圈闭的有效识别,对有利目标进行了精细落实。经钻探验证,取得了较好的勘探成效,为涠西南凹陷岩性地层油气藏勘探积累了丰富的经验。

Flow through the establishment of sequence stratigraphic framework of the first member of Liushagang formation in Weixinan depression,the spatial distribution characteristics within the stratigraphic framework of sedimentary system and sedimentary facies were clear,the North provenance turbidite fan depositional system in the downthrown side of the 1 st fault zone,the West provenance turbidite fan depositional systems in the long axis of 2 No fault zone,shore shallow lake dam sedimentary system near WZ6-B and southern provenance turbidite fan depositional system were identified as favorable exploration directions of lithologic and stratigraphic traps within the first member of Liushagang formation in Weixinan depression.Integrated seismic facies analysis,seismic attribute analysis and high-resolution seismic inversion techniques,the lithologic-stratigraphic traps were effectively identified,and the favorable targets were carefully fulfilled,the exploration results were verified by drilling,good experiences were accumulated for the exploration of lithologic and stratigraphic reservoir in Weixinan depression.