A practical method for predicting marine saturation of NGH.

Natural gas hydrate (NGH), a high-efficiency and clean unconventional energy, is an important alternative energy of fossil fuels in the future. 98% of the world's NGH is distributed in the sea area. BSR, anomalous attributes, and inversion techniques are widely used to predict the accumulation degree of NGH in the sea, but none of them can be used to directly predict NGH saturation. Therefore, we have relatively limited ability to represent the accumulation degree of NGH in the sea area. Although there are currently some methods for directly predicting the saturation of NGH, the method is based on test and no prediction result is obtained. The disadvantages of this method are the long calculation time and that the system error is not taken into account, and therefore it may lead to difficulty in practical promotion of the method. In view of the problems in the prediction of NGH saturation, a new idea of prediction has been developed in this research, with the main advantage that it can better eliminate the system error, thus to improve the prediction accuracy; this idea is then introduced to the existing three classic NGH saturation prediction methods; finally, based on the data of the Shenhu sea area of China, Wood method with the smallest prediction error is selected from the three prediction methods, which is the most applicable NGH saturation prediction method. [ABSTRACT FROM AUTHOR]