Structural deformation characteristics and shale gas preservation of Lower Yangtze region.

Based on the analysis of field observation, drilling data and geophysical data, this paper interpreted the structural deformation characteristics of Lower Yangtze region and its preservation potential for shale gas. The results show that the deformation characteristics of Lower Yangtze region vary in different areas. The structural style is not only different from south to north, but also from east to west. To the east of Maoshan, the structure style is mainly controlled by decollement folding, which was caused by the Indosinian-Yanshan movement. The following extension and reversion movements greatly are destroyed the previous structures. So it still has good shale gas preservation conditions for shale gas and not very hard to explore. The west Maoshan region, however, is strongly reworked by strong reverse and tension movements since the Indosian-Yanshan movement, and as a result a serious of extensional and faulted basins and volcanic basins were formed, which are very negative for the shale gas preservation and explorations. [ABSTRACT FROM AUTHOR]