| 柴达木盆地北缘北西(西)向断裂及其油气地质意义 |
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| 引用本文：高长海,查明.2007.柴达木盆地北缘北西(西)向断裂及其油气地质意义[J].地球学报,28(3):283-290. |
| DOI：10.3975/cagsb.2007.03.07 |
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| 基金项目:中国石油天然气股份有限公司重点科技攻关项目(编号:2004KY10031) |
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| 中文摘要:柴达木盆地的重力、地震等资料显示,柴达木盆地北缘发育众多的北西(西)向断裂构造带.平面上,这些断裂带自北向南成排成带展布,与重力异常反映的构造格局具有很好的对应关系,控制着褶皱带的走向和发育;剖面上,这些断裂表现为上、下"两层楼"式结构,分别控制着上、下第三系的沉积与演化.研究表明,北西(西)向断裂带对区内油气的聚集与成藏具有重要的控制作用:①烃源岩的展布明显受北西(西)向断裂的控制;②形成多种与断层有关的构造样式,圈闭类型以与逆断层有关的断背斜和断块型构造圈闭为主;③既可作为油气运移的通道,也可作为油气运移的遮挡物.可见,北西(西)向断裂带对本区油气的运聚成藏具有重要的地质意义. |
| 中文关键词:柴达木盆地北缘 北西(西)向断裂 构造样式 油气地质意义 |
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| The NW(W)-trending Faults on the Northern Margin of the Qaidam Basin and Their Oil-Gas Geological Significance |
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| Abstract:The gravity and seismic data obtained from the Qaidam basin show that the northern margin of the Qaidam basin has developed numerous NW(W)-trending fault belts. Laterally, these fault belts assume zonal distribution from north to south. They are associated with the tectonic framework reflected by the gravity anomaly, and control the strike and development of the fold belts. Vertically, these faults show an upper and lower "two-layer building" construction, and control the deposition and evolution of Neocene and Eogene sediments. Researches reveal that the NW(W)-trending fault belts have important controlling effects on hydrocarbon migration and accumulation within the area, as evidenced by the following phenomena: ① NW(W)-trending faults obviously control the distribution of source rocks. ② They formed multiple structural styles related to faults, with the structural traps of faulted anticlines and faulted blocks related to reverse faults being the main types of traps. ③ They serve not only as pathways for hydrocarbon migration, but also as shieldings of hydrocarbon migration. Based on the above analysis, it can be concluded that the NW(W)-trending fault belts have important geological significance in the migration and accumulation of hydrocarbon within the area. |
| keywords:northern margin of Qaidam basin NW(W) faults structural styles petroleum geological significance |
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