柴达木盆地第四系气田遥感综合勘探研究
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摘要
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
Gas fields in eastern Qaidam Basin are low amplitude structures,which are not shown well in seismic profiles because gas levels, the shallow gas and surface salt fens can result in low velocity effect on normal lines.The Quaternary gas structures were synsedimentarily developed.The enhancement methods are presented and used for interpreting several structures on landsat images.The surface geochemical exploration and magnetic sampling of the Sebei 1 gas field and the newly found Danan 4 show that the Danan 4 structure has similar geochemistry anomaly with that of Sebei 1,and soil magnetic data suggests that Danan 4 structure may be developed with basement uplifted.Seismic data illustrate that several events have pull-down effects on a cross line,and that a low amplitude structure displays on the main profile of Danan 4.The comprehensive analysis shows that Danan 4 should be a gas field controlled by low amplitude structure with NWW axis.
Gas fields in eastern Qaidam Basin are low amplitude structures,which are not shown well in seismic profiles because gas levels, the shallow gas and surface salt fens can result in low velocity effect on normal lines.The Quaternary gas structures were synsedimentarily developed.The enhancement methods are presented and used for interpreting several structures on landsat images.The surface geochemical exploration and magnetic sampling of the Sebei 1 gas field and the newly found Danan 4 show that the Danan 4 structure has similar geochemistry anomaly with that of Sebei 1,and soil magnetic data suggests that Danan 4 structure may be developed with basement uplifted.Seismic data illustrate that several events have pull-down effects on a cross line,and that a low amplitude structure displays on the main profile of Danan 4.The comprehensive analysis shows that Danan 4 should be a gas field controlled by low amplitude structure with NWW axis.
引文
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[4]王桂宏,张友焱,岳兵,等.柴达木盆地第四系气田构造遥感信息提取[J].石油勘探与开发,1998,25(4):7-9.(WANG Gui-hong,ZHANG You-yan,YUE Bing,et al.The remote sensinginterpretation of gas structures in eastern area of Qiadam basin[J].Petroleum Exploration and Development,1998,25(4):7-9.)
[5]王桂宏,张友焱,王世洪,等.柴达木盆地东部第四系局部构造形成的控制因素及分布规律[J].石油勘探与开发,2000,27(2):45-47.(WANG Gui-hong,ZHANG You-yan,WANG Shi-hong,et al.Formation and distribution of local Quaternary structures ineastern Qaidam basin[J].Petroleum Exploration andDevelopment,2000,27(2):45-47.)
[6]戚厚发,关德师,钱贻伯,等.中国生物气成藏条件[M].北京:石油工业出版社,1997.(QI Hou-fa,GUAN De-shi,QIAN Yi-bo,etal.The biogenic gas formation conditions in China[M].Beijing:Petroleum Industry Press,1997.)
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