The focus of sag evaluation is to predict hydrocarbon generation conditions in half-graben,and the matter of hydrocarbon accumulation should be mainly addressed by play assessment,with the indicators such as resources volume and abundance used with caution.

It is known that these characteristics influence greatly the ratio of flaw detection and the accuracy of flaw evaluation.

Second, it combines the loess collapse assessment with the selection of the common ways of ground treatment, and begins with assessing the loess collapse accurately to .

Cause analysis and process control on concave defect of continuous casting billet of low carbon steel;