普光气田飞仙关组层序地层划分过程中,综合分析露头、地震、岩心、测井等资料,发现一些新的层序界面识别标志:野外露头上特征明显的岩性转化面及暴露侵蚀岩溶发育带;地震剖面上识别出具有弱振幅,中—低连续特征的退覆层序界面;沉积相序变化及沉积粒序特征反映出的海平面变化规律。能谱曲线上识别出Th-K占主导和U占主导的2种异常峰点,前者被认为一般代表较大规模的海侵。根据这些新标志,运用层序地层学原理,完成了层序划分工作,并以PG2井为例阐述了三级层序特征。 During the sequence stratigraphic division of Feixianguan Formation in Puguang Gas Field, a series of new identification symbols of sequence boundaries, such as outcrops, earthquakes, cores and well logging data, have been found out. The characteristics of lithological transformation surface and exposed erosion karst Development zone; the interface of the subsidence sequence with weak amplitude and medium-low continuous features is identified on the seismic section; the variation of sedimentary facies and the characteristics of sedimentary sequence reflect the sea level change. On the energy spectrum, two abnormal peaks, dominated by Th-K and dominated by U, were identified, and the former was generally considered to represent a large-scale transgression. According to these new marks, using the sequence stratigraphy principle, the work of sequence division has been completed, and the third-order sequence characteristics have been expounded by taking PG2 well as an example.