Gas Hydrate Area Of ​​mineral Resources Quantitative Evaluation Model

This paper summarizes the global gas hydrate mineralization conditions, analyzes gas hydrate mineralization environment on the active and passive continental margin, summarizes hydrate mineralization common characteristics; it selects the typical sea areas - the Gulf of Mexico, whose statistical units have been selected where some areas have gas hydrate and the others don't. We select these units as the training area to establish the forecastable model about gas hydrate regional mineral resource estimation by using multiple linear regression and quantitive theoryⅠand Fisher discrimination model used to determining the causes of gas hydrate. These models can be attempted to use in unexplored sea area, in order to estimate latent gas hydrate resources and type, delineate emphases target zone, and provide comparison and base for exploration and research in future.According to the multiple linear regression model we can predict the occurrence of gas hydrate in the entire north slope of Gulf of Mexico and come to the conclusion: the occurrence of gas hydrate in the Gulf of Mexico mostly concentrated in Texas - Louisiana slope to the Mississippi Canyon area. Sigsbee Escarpment out to sea for the boundary, basically inside the sea the junction of shelf and the slope for the other boundary. Fischer discrimination model can be used to determine whether methane in gas hydrate is biological or thermogenic causes, and its correct rate is 82.4%. Multiple regression model will be applied to predict the northern slope of the South China Sea and we find that gas hydrate exists primarily in Cenozoic basin. The Zhujiang Mouth Basin most likely has a wealth of hydrates, and most of the basin area is more than 70% of predicted probability. According to the model , the result that the area where the probability of gas hydrate occurrence is higher is consistent with the conclusion based on previous geophysical and geochemical analysis. Southwest Taiwan basin, the Dongsha Trough and Xisha Trough area mostly have gas hydrate. Its volume of resources can be most likely to be mined, and therefore, Zhujiang Mouth Basin is commend as a priority exploration area.Fischer model can be applied to determine the cause type of gas hydrate in the northern slope of South China Sea and we find that most gas hydrate is thermogenic cause. Gas hydrate in Southeast Hainan basin and Southwest Taiwan basin is almost thermogenic hydrate. Biological gas hydrate exists around Zhujiang Mouth basin, thermogenic gas hydrate concentrated in center, where Shenhu area contained biological hydrate, which is consistent with the judgment using geochemical methods by hydrate samples. At the same time, taking the two discriminant function values to show in the coordinate system, we find it is difficult to determine the cause of hydrate in some units, so it's probable that such hydrate was formed by mixture causes combining Biological cause with heat and thermogenic cause.