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以精细岩心观察描述为基础,根据岩石类型、沉积构造及沉积序列等相标志,对研究区内HG组重点层段沉积相类型及特征进行了分析,在此基础上结合地震属性提取和砂体反演等地震沉积学研究手段,对研究区重点含气层段沉积相平面展布特征进行了刻画,预测了研究区有利砂体分布。研究表明研究区主要发育曲流河相和三角洲相沉积,主要砂体类型为曲流河边滩和三角洲平原分流河道砂体;纵向上自下而上水体由浅逐渐变深;在H6y时期,河道砂体沉积厚度最大,为储集砂体发育的最好时期;研究区有利储层砂体最有利区主要集中在中部和西南部,可作为下一步勘探开发的目标区。
Based on the fine core observation and description, the types and characteristics of sedimentary facies in the key intervals of the HG group in the study area are analyzed based on the rock types, sedimentary structures and sedimentary sequence facies markers. Based on this, the seismic attribute extraction and sandbody Inversion and other seismic sedimentology research tools, the study area of key gas-bearing sedimentary facies plane features of the characteristics of the plot to predict the distribution of favorable sand body in the study area. The study shows that the main development of meandering river facies and delta facies in the study area, the main sand body type is meandering stream beach and delta plain distributary channel sand body; the vertical bottom-up water body gradually deepens from shallow to shallow; in H6y period, The maximum thickness of body sediment is the best period for reservoir sand body development. The most favorable zone for favorable reservoir sandstone in the study area mainly concentrates in central and southwestern regions, which can be used as the target area for exploration and development in the next step.