柴达木盆地三湖地区构造特征及与成藏关系分析
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摘要
通过对柴达木盆地三湖地区万余剖面千米地震剖面进行地质解释,指出三湖地区发育柴南和柴中两条走滑断层,柴中断层对三湖地区构造形成起主要控制作用。早更新世末,柴达木盆地在南北挤压作用下,柴中断层右行走滑回返逆冲,伴生了区内3条雁列式的背斜带,即断背斜带、斜坡低幅背斜带和中央低幅背斜带,从柴中断层向南,褶皱强度依次减弱。最后,依据构造、保存条件,以及主力生气区与已知气田关系,指出三湖地区第四系生物气藏主要受构造背景、区域斜坡带以及生气强度和盖层控制,认为南部中央低幅背斜带是寻找未知构造气藏的有利区。
Based on the geological interpretation of more than ten thousand seismic profiles of 1000 meters in Sanhu region of Qaidam Basin,this paper shows that two strike-slip faults developed in the basin,among which one in the south of the basin and another in the middle of the basin,while the latter one has played an important role in the formation of the structure of the region.Three en-echelon anticline belts,i.e.,the faulted anticline belt and the slope anticline belt with low amplitude as well as the central anticline belt with low amplitude developed in the region in Early Pleistocene owing to the right-lateral strike-slip and inversion thrust of the fault in the middle of the basin under E-W compression.Fold intensity gradually decreases from the belt in middle Qaidam to the south.This paper finally reveals that the Quaternary biogas reservoir is mainly controlled by structural background,regional slope belts,gas generation intensity,and cap rock,based on structural conditions,preservation conditions,and the relationship between essential gas-generating regions and known gas fields.It suggests that the central anticline belt with low amplitude in the south of the basin is favorable for discovering structure conglomerate gas reservoirs in the future.
Based on the geological interpretation of more than ten thousand seismic profiles of 1000 meters in Sanhu region of Qaidam Basin,this paper shows that two strike-slip faults developed in the basin,among which one in the south of the basin and another in the middle of the basin,while the latter one has played an important role in the formation of the structure of the region.Three en-echelon anticline belts,i.e.,the faulted anticline belt and the slope anticline belt with low amplitude as well as the central anticline belt with low amplitude developed in the region in Early Pleistocene owing to the right-lateral strike-slip and inversion thrust of the fault in the middle of the basin under E-W compression.Fold intensity gradually decreases from the belt in middle Qaidam to the south.This paper finally reveals that the Quaternary biogas reservoir is mainly controlled by structural background,regional slope belts,gas generation intensity,and cap rock,based on structural conditions,preservation conditions,and the relationship between essential gas-generating regions and known gas fields.It suggests that the central anticline belt with low amplitude in the south of the basin is favorable for discovering structure conglomerate gas reservoirs in the future.
引文
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[4]顾树松.柴达木盆地东部第四系气田形成条件及勘探实践.北京:石油工业出版社,1993
[5]顾树松.柴达木盆地第四系生物气藏的形成与模式[J].天然气工业,1996,16(5):6～9
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