Quantitative evaluation on contribution of structural compression to overpressure and analysis on origin of overpressure in Kuqa Depression;

Research on inclusions and mudstone compaction curves shows that uncompaction and structural compression are the main factors resulting in abnormal high pressure in Early Cretaceous gas reservoirs.

Discovery of compressional structure in Wuerxun-Beier Sag in Hailar Basin and its geological significance

Through the research of the compressional structure drilled in Guxi buried low hill,it is discovered that the reversed fault is characterized by the upturning of beds in Low Paleozoic of the hanging wall,wedge invasion of igneous rock along the level in Upper Paleozoic near the bottom wall fractured surface.

Previous investigators considered that the origin of the overpressure now is mainly controlled by tectonic compression, and the charging of high-pressured gas and tectonic uplifting in addition, but generally not existing influence of undercompa.

The authors think that the central paleouplift in the Ordos basin was formed under the nearly E W lateral compressive stress produced by the collision and amalgamation of the Qilian trough and the Ordos basin in early Palaeozoic time.

Also a new method on shear stress in beams is advanced and the calculation formula of shear stress and bearing stress of arbitrary variable cross section beams is derived.