A COMPARATIVE STUDY ON GAS HYDRATE ACCUMULATIONS IN SHENHU AREA AND XISHA TROUGH

There are great amount of natural gas hydrate resources in the Shenhu area and Xisha Trough, the north of South China Sea.However, there are differences in both the reservoir forming conditions and accumulation mechanism of gas hydrate between the two regions.In this paper, through the analysis and comparison of water depth, temperature, pressure, gas source, gas migration, as well as reservoir characters and other factors, we reached some conclusions as follows.①The two regions are similar in terms of water depth, temperature and pressure conditions, gas source type, gas migration conditions, hydrate reservoir type and reservoir characteristics.②Based on the analysis of the gas source, the supply and transportation system of natural gas, it is believed that the formation of gas hydrate in the Shenhu area is dominated by the "self-source and heterogeneous source leakage complex " model.③The gas hydrate in the Xisha Trough is a typical hydrate of "heterogeneous leakage type".The results of the study suggest that the time-space matching between gas source and migration channels is the key to the evaluation of hydrate exploration in this area.