火山岩体识别技术在辽东凹陷的应用

Volcanic rock identification in Liaodong Sag

辽东凹陷火山岩受控于中部基底大断裂,沿大断裂呈南北对称分布,依此建立了该区火山岩早期丘形喷发、后期层状溢流的发育模式。在此基础上,采用地震反演、波形聚类属性、时间切片等技术发现和落实了红星等4个火山岩体;综合对比分析认为,该区火山岩具有中心式多期次喷发、裂隙式喷发以及中心—裂隙式喷发等三种模式,其中红星火山岩体属于中心式多期次喷发模式。根据对火山岩的综合评价结果,提出了建议井位,在被采纳钻探的井中有两口见良好油气显示,其中一口获高产工业油气流,显示良好勘探前景。

In Liaodong Sag,the volcanic rock is controlled by the basement fault located in the middle of this area.The volcanic rock distribution appears as the North-South symmetry along the basement fault.Based on this understanding,we establish the volcanic rock development model with dome shaped eruptive rock in early stage and layered effusive rock in late stage.Using seismic inversion,waveform clustering,and time slices,4 volcanic rock bodies are discovered and confirmed.According to comparative analysis,we consider that the volcanic rock bodies in the area have three eruption models:central eruption,multiphase central eruption,fissure eruption.Hongxing volcanic rock body belongs to multiphase central eruption model.By the comprehensive evaluation,we have proposed a few well locations.Commercial oil and gas is discovered from one of the drilled wells,and good hydrocarbon show is found from another drilled well.