Abstract: The eastern part region of Qidam basin is a Quaternary depositional and subsidence center being large and extensively distributed.The development of contemporaneously depositional structures developrnent is small in range. This region is favorable area for gas generation, migration and accumulation. The gas bearing formation is younger and shallow,thethickness is big,the structures conditions are sirnple,and the gas reservoir has. a unique andtypical feature. Tainan gas field is a prolific gas field discovered in recent years with typicalfeature and is a large one. This paper analyzes the geological and geophysical feature of gasreservoir from structure morphological feature,sedirnentary facies model,gas reservoir typeand abnormal information in gas-containing etc. demonstrates the relations between the special geological texture and unique seismic abnormal;analyzed the high production rate andabundance factors of gas fields. It is important to both optimum exploration and developmentprogram, and also gives some reference for areas with similar seismic and geological conditions.

Key words: Qidam basin, gas reservoir, edimentary structure, low speed, anomaly, analysis

摘要： 柴达木盆地东部地区是第四纪的沉积与沉降中心,内陆湖泊相的沉积厚度大、分布广泛。小幅度同沉积构造发育,是天然气生成、运移和聚集的有利地区。由于含气地层新、埋藏浅、厚度大、构造条件简单,气藏特征独特具有典型意义。柴达木盆地东部地区经过三十多年的勘探,发现了一批第四系天然气田。台南气田是近年来发现的规模较大、特征典型的高产气田。本文从构造形态、沉积柑模式、储集层类型和含气异常信息等方面分析了气藏的地质与地球物理特征,和特殊的地质结构与独特的地震异常之间的关系,以及气田高产富集的因素。

关键词: 柴达木盆地, 气藏, 沉积构造, 低速, 异常, 分析