abnormal place
5.With a differential accumulation analysis of the fault closeness and the difference of faulted reservoir in Beitang depression, it is suggested that(1) an inactive fault in clastic sequence may mainly restrict hydrocarbon migration; (2)undercompacted shales with overpressure can lead to strongly restricting hydrocarbon migration along faults; (3)hydrocarbon segregation associated with fault traps more probably takes place in undercompacted zone with abnormal hydropressure.
6.It represents the accident types of manually dig cast-in-place pile,introduces the corresponding management methods from the detection of foundation,design and construction,points out that should check the operation states of the equipment consciously before and in the process of construction,and should stop at once when the abnormal is generates,to prevent the happen of personal casualty.

