松辽盆地南部构造圈闭系列

STRUCTURAL TRAP SERIES IN SOUTH SONGLIAO BASIN

松辽盆地南部不同的演化阶段发育不同的构造圈闭系列。断陷阶段的裂陷期，受张裂运动影响，主要发育伸展构造，构造圈闭以同生披覆构造、生长背斜为主；断陷阶段的反转期，受登娄库期末挤压构造运动的影响，反转构造较为发育，构造圈闭以反转背斜为主。坳陷阶段的沉陷期，构造相对平缓，受古构造格局的控制，构造圈闭以继承性同沉积背斜、同沉积背斜为主；坳陷阶段的褶皱抬升期，受嫩江期末、明水期末构造运动的影响，主要发育挤压和走滑构造，构造圈闭以反转背斜、断块背斜以及花状构造为主。对深部领域的油气勘探来说，同生披覆构造、同沉积背斜、反转背斜，特别是多期继承发展的构造圈闭是勘探的首选目标。

Different structural trap series developed in different evolution stages of the faultdepression process in the south of Songliao Basin. During fault-depressing period,extensionalstructures mainly developed in cracking stage under the influence of extension fracturing,andtraps formed in this period are primarily syngenetic drape structures and growth anticlineslreversal structures that resulted from the compressional tectonics of Dengluku stage developed well,the structural traps formed in that time are mostly reversed anticlines. During depressing period,gentle structures occurred in subsiding stage, and the traps formed in thisstage are basically inherent syndepositional anticlines, syndepositional anticlines; compressional and strike-slip structures developed in fold-uplifting stage due to the influence of LateNenjiang-Late Mingshui tectonics and structural traps formed then are reversal anticlines,fault-block anticlines and flower shape structures. It is suggested that the syngenetic drapestructures, syndepositional anticlines, reversal anticlines, especially multi-stage inherentstructural traps are the most favourable targets for deep-seated hydrocarbon exploration.