关键词: 柴达木盆地, 气藏, 沉积构造, 低速, 异常, 分析

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