Abstract:

 Based on interpretations of the 3D seismic  and well data, we have systematically elucidated the geological representations of Mesozoic and Cenozoic tectonic movements in Jiyang Sag, Bohaiwan Basin. The compressional tectonic system, the extensional tectonic system and the strike slipping tectonic system, which developed in different tectonic evolution stages, have been determined in this paper. The thrusts during Indosinian Movement consist of several arc thrusts protruding to NE or NNE direction, and negative inversion of these thrust controlled strongly the development of late Mesozoic and early Cenozoic basins. The unconformity (Tgm) indicating the main episode of Yanshan Movement has been identified clearly in seismic profiles, and the distribution pattern and the type of late Mesozoic basin in Jiyang Sag have also been determined. Combined with the analysis of regional tectonic dynamic setting, the complicated superposition structure and basinmountain conversion mechanism have been discussed. From the study of tectonic and evolution of sedimentary basin, we have revealed the Mesozoic and Cenozoic intracontinental dynamic process of eastern North China Block, which will be of benefit to the hydrocarbon exploration in the study area.

Key words:

Key words: Jiyang Sag; negative inversion structure; transform of tectonic mechanism; Mesozoic and Cenozoic basins