松辽盆地莺山地区营城组火山岩喷发特征研究

Volcanic rock eruption characteristics research in Yingcheng Formation of Yingshan area of Songliao basin

莺山地区火山岩的岩石类型复杂,区域分布状况不均衡,岩性横向变化快,物性致密,火山岩油气藏勘探难度大.火山岩喷发特征研究能够揭示火山岩空间展布规律和不同岩性组合的成因联系,能够为火山岩储层勘探提供有效的指导.通过钻井、测井及三维地震等资料的综合分析,将莺山地区营城组火山岩划分为三个旋回,六个期次.在精细分期次层序约束的框架下,利用相干体技术和趋势面分析法并结合火山机构在地震上的响应特征,分期次地识别火山口及火山机构,通过分析各个期次火山机构分布及演化特征开展本区火山岩喷发特征研究,总结了本区火山岩喷发规律.研究结果表明:莺山地区营城组火山岩喷发具有阶段性和差异性,各期次喷发强度差异大,总体表现为逐渐增强的趋势,旋回内部表现为先强后弱的特征.方向由东南向西北迁移,主要形成东、中、西三个大的火山机构发育带.

Because of the volcanic rock complex type, unbalanced regional distribution, lithology lateral change fast and high physical density, volcanic rock reservoir exploration is difficult in Yingshan area. Volcanic eruption features research can reveal volcanic rocks space distribution regularity and the genetic relationship of different lithology combination, which can provide effective guidance for volcanic reservoir exploration. Through drilling, logging and 3D seismic data comprehensive analysis, the Yingcbeng Formation volcanic rock in Yingshan area is divided into three cycles, six times. In the framework of the fine time sequence constraint, the each time crater and volcanic edifice were identified by using coherence technology, trend surface analysis method and the volcanic edifice response characteristics on the seismic. Through analyzing the each time volcanic edifice distribution and evolution characteristics, volcanic eruption characteristics research was carried out, the law of volcanic eruption was summarized in this area. The research result shows that the Yingshan Formation volcanic eruption has phase and difference in Yingshan area. There is great difference in eruption intensity of each period. Overall eruption intensity gradually increases and is from strong to weak characteristics in cycle inside. The eruption strength migrates from the southeast to the northwest, mainly forming the eastern, central and west volcanic edifice development zones.