Rock deformations in the zones are mainly in quasi-plastic to brittle mechanisms without typical mylonite, suggesting the formingdepth should be less than 10 km.
拆离带岩石变形机制以准塑性-脆性为主，未发育典型的糜棱岩，形成深度应小于10公里。
2
According to the ore-formingdepth and condition of physical-chemical, these deposits may be classified into three class: deep-zone type, mesozone type and epizone type.
依矿床形成深度和物理化学条件等差异，将其划分为深部带型、中部带型和浅部带型三亚类。
3
The purpose of perforation is penetrating the casing tube, cement sheath and a certain depth of the formation and forming unhindered channels for oil and gas flowing into the well casing.