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鉴于松辽盆地白垩纪营城组火山活动多中心、多旋回、火山物质运动方向多变、成分复杂等特征,依据火山旋回的三个基本要素,即共生序列、内在规律的外部结构表现、同源性,着重考虑对储层研究的指导作用,采用“组内划段—段内划旋回—旋回内划期次”的方案,定义火山旋回为火山活动强度由平静到强烈再到平静而构成的喷发周期内形成的一套火山岩组合,由一系列具有同源性的火山岩构成。一个至若干个期次构成一个旋回,岩性演化具方向性:从基性→中性→酸性的连续变化或其中部分连续变化,相序上呈周期性演变。经大量盆内钻井和盆缘剖面资料研究,将营城组一段和三段分别划分出3个火山喷发旋回。
In view of the volcanic activity of the Cretaceous Yingcheng Formation in the Songliao Basin, such as polycyclic volcanic activity, multi-cycles, volcanic changes in the direction of movement and complex composition, the three basic elements of volcanic cycle, that is, the symbiotic sequence, Source, focusing on the guiding role of reservoir research, the use of “group within the group - paragraph within the cycle - within the cycle of cycles ” program, define volcanic cycle volcano activity intensity from calm to strong and then to calm A volcanic assemblage formed during the eruption cycle consists of a series of volcanic rocks with similarities. From one to several periods form a cycle, the evolution of lithology with a direction: from the basic → neutral → acidic continuous changes or part of the continuous changes in the phase sequence showed a cyclical evolution. After a large number of basin drilling and basin profile data research, Yingcheng Formation first and third sections are divided into three volcanic eruptions.