During Middle Triassic, the Gejiu area was in a special sedimental environment, i. e. in a restricted marginal sea basin within the continental rift system.
中三叠世，个旧矿区处于特殊的沉积环境—陆裂谷系中的局限边缘海盆。
According to tectonic zonation, the coal basin mainly restricted by secondary fault depression of NE reflex arc, meanwhile secondary EW and NE composite convergence existed.
从总的区域构造分布看，含煤盆地沉积主要受北东向反射弧的次一级断裂坳陷所制约，同时也存在着次一级的东西向与北东向复合交汇控制特征。
Till the late stage, the periodic sea-level changes resulted in the formation of the evaporite deposits in restricted shallow-water basin and mudstones and gravity-flow deposits in deep-water basins.
晚期因周期性的海平面变化导致形成局限浅水盆地、蒸发岩沉积和深水盆地泥岩和重力流沉积。
Ansai Oilfield is located on the Loess Plateau to the east of Shan-Gan-Ning Basin. Restricted by its geographical environment, the management on dosing system has always been its weak point.
安塞油田地处陕、甘、宁盆地东部黄土高原，由于地理环境限制，加药系统管理一直是薄弱环节。
Ansai Oilfield is located on the Loess Plateau to the east of Shan-Gan-Ning Basin. Restricted by its geographical environment, the management on dosing system has always been its weak point.
安塞油田地处陕、甘、宁盆地东部黄土高原，由于地理环境限制，加药系统管理一直是薄弱环节。
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