济阳坳陷挤压构造发育特征与成因机制探讨

Based on the newest 3-Dimension seismic data and drilling data, the compressional structures of the geological history in Jiyang depressiion were identified, and its formation mechanism was also analyzed, the results showed that Jiyang depression experienced three tectonic compression periods, including late Triassic, late Cretaceous and the end of Paleogene. The compressional structures developed in late Triassic were controlled by the SSW-NNE trending horizontal compression stress which came from the Yangtze plate's subdcution and collision to North China, and the collison resulted in the formation of widespread developed NW(W) trending thrust faults and compressional folds; during late Cretaceous the deep new lithosphere induced the compression and shrinkage in shallow layers and the compression stress primarily came from the eastern of the basin, so the corresponding compressional structures were mainly developed in the northeastern of the basin with NS(NNS, NNE)-trending; the compressive mechanism at the end of Paleogene was similar to that of late Cretaceous, however, the typical compressional structures were relatively less developed, which might have something with the hard distortion of the thick strata developed by the subsidence in the strong fault depression of Paleogene, and the possible thrust fault might be located in the east part of NW-trending Chennan fault.