Abstract:

Stylolite, which is identified in the limestone, is widely used to determine stress direction, calculate the finite strain and estimate the original thickness of strata. In addition, stylolites are also the storage spaces and transportation channels of oil, natural gas and underground water. Stylolites commonly developed in Tieshan formation are suitable for the simulation. Using the Shadow Moiré method and GIS technique, this study analyzed several samples collected from Tieshan area for their three-dimensional digital morphology, which proved quantitative scale, slope, roughness, distribution of troughs, two-dimensional sections view, and amount of pressure solution of stylolites. Further we promoted the morphology of the stylolites. This paper concluded that stylolites in Tieshan area were produced by compaction and pressure solution in limestone. The forming of the stylolites depends on both factors, i.e., the nature of rock mechanics and the solution-release mechanism created by the local stress concentration.

Key words: stylolite, Shadow Moiré, method, three-dimensional model, formation mechanism