南堡凹陷是在华北台地基底上,经中、新生代断块运动而发育起来的一个中新生界北断南超的箕状凹陷,其中火山岩岩性主要为玄武岩和凝灰岩。通过划分岩流单元和岩流组,并采用综合考虑爆发指数与厚度的方法进行岩相划分,确定研究区火山岩相以溢流相为主,爆发相主要集中于喷发中心附近,同时对研究区火山岩的平面、剖面分布作了研究,为下一步火山岩的储层研究提供了依据。 Nanpu sag is a mid-Cenozoic graben-cut Sagittarius depression developed on the basement of North China Platform by Mesozoic and Cenozoic fault blocks. The volcanic lithology is mainly basalt and tuff. By dividing the lithofacies and lithofacies, and using the method of taking the exponent and thickness into consideration, the lithofacies are divided. The volcanic facies in the study area is dominated by the overflow phase, and the eruption facies mainly concentrates near the eruption center. At the same time, The volcanic rock plane and section distribution have been studied, which provides the basis for the further study of volcanic reservoirs.