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柴达木盆地东部天然气藏的圈闭为低幅度构造圈闭。该区含气层、表层气、地表盐沼等均可造成地震剖面上的低速效应,因而构造形态在常规地震剖面上得不到真正反映。该区第四系构造圈闭多为同沉积成因,对遥感数据增强处理识别出多个局部构造。选择已知的涩北1号气田和新发现的达南4号等目标进行地面化探、地磁测量等野外工作。结果表明达南4号与涩北1号具有较相似的地球化学异常。地磁异常揭示达南4号为一继承性局部构造。达南4号在常规地震剖面上有小幅度构造显示,并且多组同相轴有下拉特征。综合分析得出达南4号应为受长轴方向为北西西的构造控制的天然气藏。图6参6
The traps of natural gas reservoirs in the eastern Qaidam basin are low-amplitude structural traps. The gas-bearing layer, surface gas and surface salt marsh can all cause low-speed effect on the seismic profile, so the tectonic morphology can not be truly reflected in the conventional seismic profile. Quaternary traps in this area are mostly the same sedimentary genesis, and multiple local structures are identified for the enhanced processing of remote sensing data. Select the known Sebei 1 gas field and the newly discovered Danan 4 targets such as geochemical exploration, geomagnetic survey and other field work. The results show that Danan 4 and Sebei 1 have similar geochemical anomalies. Geomagnetic anomalies revealed that Darnan 4 is an inherited local structure. Danaan 4 has a small amplitude tectonic display on conventional seismic profiles, and multiple sets of events have pull-down features. The comprehensive analysis shows that Da Nan 4 should be controlled by natural gas reservoirs under the direction of long axis. Figure 6 reference 6