主要影响角正切是开采沉陷预计的重要参数，对于地表影响范围的确定具有重要的意义。
The tangent of the main influencing Angle is an important parameter for mining subsidence prediction and surface displacement range demarcation.
通过动态监测确定了解油藏状况，为合理设计注汽、开采和焖井参数提供科学依据。监测井间汽窜和水侵等井况的发生。
Through dynamic monitoring the reservoir status is determined, which is providing scientific basis for the rational design, steam injection, extraction and soaking parameters.
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