In the Dongying Depression, high abundance of parallel microfractures are found in the hydrocarbon source rocks of the upper unit of E 2-3 s 4 Member and the lower unit of E 2-3 s 3 Member.

The type, density and open width of the microfractures in Shiwu faultdown are studied systematically, in which the mechanics and factors controlling microfractures are stated.

There are microfractures in coal matrix block,which are 10-20μm wide,50-1000μm high.

Application of fluid inclusions in microfissures to study of hydrocarbon migration and accumulation: A case study of Gaoyou depression;

It shows that microfissures in residual soil are of key element to stability and deformation of pits through the engineering practice of microfissure in residual soil and the results of displacement sedimentation observation.

The mini-stress field of the mineral grain is changed under such a strain, resulting in change in structures such as shift and reorientation of grains and growth of crack in the radialdirection.

In order to study the mechanism of the difference of gravity changes in different areas,gravity changes as well as the relationship between gravity and crustal upheaval produced by small cracks of four-types in dilatancy under different stress before earthquake are investigated in this paper.

From the SEM images,the microcracks microstructural parameters,including length,azimuth angle and spacing,were obtained and statistical.

The micro fractures are firstly formed in roof above the working face.

Distribution characteristics of micro-fracture of high rank coals in northern foot of Dabie Mountains;