The relatively simple and feasible method i. e. the liquefaction test for evaluation of sludge stabilization (degradation degree) has been recommended.

Compared with other direct coal liquefaction processes, IGOR process is characterized with higher throughout of coal hydrogenation reactor, higher integration degree and higher quality of oils.

The fuzzy comprehensive evaluation model of seabed liquefaction degree was established, and the main parameters that influence liquefaction were analyzed.