Theory and Practices on Exploration Technology of Land Gas Hydrates in China

According to the problems existed in the exploration technology of the land gas hydrates, with the analysis on the development and present status of the exploration technologies at home and abroad, based on the exploration of the gas hydrates in Qinghai Muli Coalfield, the site practices and theoretical analysis method were applied to the study on the conventional logging parameters and the simple temperature measuring method.The results showed that the conventional logging para meters would be feasible to the comprehensive explanation of the freezing ground.The achievement was successully applied to the full area of Muli Coalfield.The drillin g borehole numbers of the liked gas hydrates and the layer number of the liked gas hydrates were found.The theoretical analysis found that the temperature measured with the simple temperature measuring method had an error to the actual temperature. The error correction value was 20 m obtained from the site measurement and the theoretical calculation combination.The actual depth of the gas hydrates was accurately calculated and a distribution drawing of a single borehole accumulated depth fo r the seemed gas hydrates was made.