赵凡,孙德强,闫存凤,张小军,孙松领 ,倪祥龙 ,程玉红
ZHAO Fan,SUN De-qing,YAN Cun-feng,ZHANG Xiao-jun,SUN Song-ling ,NI Xiang-long ,CHENG Yu-hong
摘要:
柴达木盆地是中国西北地区一个中、新生代陆相含油气盆地,具有青藏高原区域构造背景,位处两大汇聚板块的过渡地带,并与周缘造山带相伴生;发育于被动板块边缘之上,自中生代以来,其分别经历2次由弱到强的拉张和挤压作用,最终形成了一系列复杂构造样式。就形成机制而言,柴达木盆地是柴达木微板块向北俯冲碰撞及相应的南祁连山不断隆升和向南逆冲—推覆北昆仑山不断隆升共同作用的结果。通过野外区域地质调查、地震地层学以及钻井资料研究和分析,揭示出柴达木盆地自中生代以来,盆地演化经历了4个不同的盆地演化阶段,即早—中侏罗世断陷沉积盆地阶段、晚侏罗世—早白垩世伸展盆地反转和相应挠曲型盆地形成阶段、晚白垩世—始新世盆地整体缓慢平稳沉降阶段、自渐新世以来印度—欧亚大陆强烈碰撞引起的盆地挤压和抬升阶段,特别是在第4个演化阶段使柴达木地块处于明显的挤压和抬升状态,并逐渐形成盆地的现今地质结构。最后分析了盆地构造演化与油气成藏的关系,指出柴达木盆地油气勘探前景广阔。
中图分类号:
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