Volcanic Eruption Phases and 3-D Characterization of Volcanic Rocks in BZ34-9 Block of Huanghekou Sag,Bohai Bay Basin
Zhu Hongtao
Liu Yimeng
Wang Yongli
Zhou Xinhuai
Yang Xianghua
Abstract：A new method of seismic amplitude and variance cube thresholding display is proposed to enhance the description of the spatial and temporal distribution of volcanics and eruption phases in this paper,on the basis of the contrasting seismic reflections between volcanic channel facies (high continuity and strong seismic amplitude)and overflow facies (low continuity and weak seismic amplitude).Which has been applied and validated in the BZ34-9 block of Huanghekou Sag,Bohai Bay Basin. The study of 3D characterization of volcanics and eruption phases in BZ34-9 block leads to the follows conclusion.(1)Volcanics in the First and Second Members in the Shahejie Formation are located locally in the central part of study area,showing a cen-tral eruption style;whereas volcanics in the Dongying Formation are characterized by a widespread distribution in the southern gentle slope of study area,showing central,fissure-central eruption composite style.(2)For the First and Second Members in the Shahejie Formation,volcanic eruption in the eastern part is earlier than that of western part,while the southern one is earli-er than that of northern one.(3)For Dongying Formation,volcanic eruption of the southern part is earlier than that of north-ern part,and the phases of the southern part are also more than those of northern part.(4)Compared to the First and Second Members of the Shahejie Formation,volcanic eruption in the Dongying Formation is characterized by more active,multi-period eruption,and widespread distribution.
Keywords：volcanic rockspatial and temporal distributioneruption phasesHuanghekou sag
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 1309-1316 )