火山岩圈闭的识别方法

Recognizing method of volcanic trap

松辽盆地深层营城组天然气气藏是火山岩圈闭气藏,识别火山岩圈闭可为天然气勘探提供钻探目标。因此,通过总结徐家围子断陷火山岩圈闭模式(火山岩岩性圈闭、火山岩岩相圈闭、火山岩岩性-断层圈闭)认识了火山岩地震响应特征,同时对火山岩储层进行了层位解释及火山岩岩体识别,并应用相干体、地震反演等技术识别出松辽盆地徐家围子断陷营城组火山岩圈闭,从而形成了火山岩圈闭识别方法。应用该方法在徐家围子断陷识别了营城组火山岩圈闭,并通过钻井证实了火山岩圈闭识别方法的可行性,而且具有Ⅰ、Ⅱ类地震相特征的火山岩岩性-断层圈闭气藏的识别成功率较高。

Deep-layer natural gas reservoir in Yingcheng Formation of Songliao Basin is volcanic trap. The recognition of this kind of trap can provide the drilling target of natural gas exploration. Therefore through summing up the volcanic trap models in Xujiaweizi faulted depression （volcanic lithological trap, volcanic facies trap, and volcanic lithological-fauh trap）, the seismic characteristics of above rock have been understood. At the same time, layer interpretation and volcanic body recognition of volcanic reservoir have been conducted. With the help of coherent body, seismic inversion and so on techniques, the volcanic trap in Yingcheng Formation of the above depression has been recognized and then a set of determining method of above rock has been established. The feasibility of this recognizing method has been proven by drilling facts afterwards and moreover the recognized success ratio of volcanic lithological-fault trap with Ⅰ and Ⅱ type seismic facies characteristics are pretty higher.