泌阳凹陷孙岗地区地震相识别

泌阳凹陷孙岗地区钻、测井资料较少，而地震资料较丰富。 为了解研究区沉积特征，利用地震相识别方法对该区内典型地震相以及地震相平面特征进行了研究。 根据地震相与沉积相的对应关系，参照瞬时频率地震属性平面图、古地貌发育情况以及少量井的单井相特征，将地震相平面展布图转化为沉积相平面展布图。 通过研究，共识别出 4 种典型地震相：楔状前积地震相、斜交前积地震相、叠瓦状前积地震相、平行-亚平行地震相。 在研究区北部，核三段Ⅰ砂组上段和下段沉积时期均大面积发育不同期次辫状河三角洲前缘沉积体；在研究区南部，上段沉积时期仅发育 1 个扇三角洲前缘朵叶，下段沉积时期发育 2 个扇三角洲前缘朵叶。

Seismic facies identification in Sungang area, Biyang Sag

In order to understand the sedimentary characteristics in Sungang area of Biyang Sag, the typical seismic facies and the planar characteristics of seismic facies of the study area were studied by using the seismic facies identification method. Based on the corresponding relation of seismic facies and sedimentary facies, instantaneous frequency planar graph, palaeogeomorphology and the single well facies of some wells, the planar graphs of seismic facies were translated into the planar graphs of sedimentary facies. By the study, four typical seismic facies in the study area were identified, including sphenoid foreset facies, oblique foreset facies, imbricate progradation facies and sub- paralleling sheet facies. In the northern study area, there are vast braideddelta front subfacies of the different period in the upper sub-member and the lower position of sand group I of He 3 member. In the southern study area, there is only one leafy sand body of fan delta front in the upper sub-member of sand group I of He 3 member, and two leafy sand bodies of fan delta front in the lower position of sand group I of He 3 member.