| Amu-Darya Basin is one of the significant large potential petroliferous basins in Middle Asia. Both Chardzhou and Bukhara terraces, which are located in the northeastern of Amu-Darya Basin, provide more than a half of petroleum resources volume of the basin. Rich hydrocarbon is accumulated dominantly in local anticlines and reef traps, which are closely relative with structural formation and evolution in this basin. On the basis on available geological data, fine stratigraphic correlation and seismic data interpretation, two key geological interfaces, the fault ing-depression transform interface at the end of Jurassic and the regional angular unconformity at the end of Pale ogene, are recognized and the relative deformation phases are defined according to the theory of plate tectonics. It is suggested that the important stages of Jurassic-Cretaceous faulted depression and Paleogene compressed up lifting-reformation have undergone within these terraces, which results in forming the upper, the middle and the lower synthems. The sedimentation in the faulted depression stage controlled the tectonic framework of this region and the development of the salt layers in the middle synthem advanced the succeeding tectonic patterns. Tectonic ovements during Paleogene-Neogene time brought on extensive structure deformation in this region, which constructs a series of typical structural belts such as thrust belts, strike-slip fault belts and asymmetrical composite anticline belts. |
