The diapiric structures display various types such as a turtleback-like arch, weak piercing, gas-chimney, fault (or crack) and seabed pit, originated in two huge mud-rich strata the Wenchan.

Its particularstructural location and sedimentary environment brought various structural styles,including fault blocks, flowery structure, diapiric structure, inversion structure,buried hills and These geological structures occurred respectively in differentgeological ages and locations, forming superposition structures, so that they creat-ed favourable plac.

The BF is a diapiric structure caused by basement .

The relationships between diapir structure and gas hydrate mineralization;

The features and types of a new structure fluid diapir structure are discussed in this paper,taking those in Yinggehai and Bohai Bay basins as examples.

A fluid diapir model is proposed based on the features of diapir structures and their associated abnormal temperature and pressure data in Yinggehai basin, This paper also further discusses the significance of fluid diapirs to petroleum geology.