Tertiary Deep Water Genesis in Huanghua Rift Basin

This paper makes a quantitative study, in terms of the geologic setting and characteristics of aqueous system, partition of hydrogeological stage and types of hydraulic pressure system in Huanghua rift basin, of the recovery thickness of sandstone and mudstone, of the extrude output of water and of the intensity of groundwater exchange on each interested layer in its different periods by means of inversion and geostatic pressure and the established mathematical model. The results indicate that the intensities of sedimentary water exchange on each investigated layer in its different periods are less than 1. The cumulative values of the intensities are more than 1 in Es², Es¹, Ed, and less than 1 in Ng, Nm. The infiltration groundwater exchange intensity is 0.44 in Ed. Each investigated layer in its different periods is similar to each other in terms of both the location of high-pressure belt and the flow characteristics in the groundwater flow field. In addition, their major characteristics are centrifugal flow. The study of the initial and modern hydrochemistry and of their evolution shows that the groundwater in the six layers is all of the syndeposit origin in different concentrations. Comparing the modern groundwater concentration with the initial one, except for part of the water in Ek¹ layer that remarkably decrease and evolve toward the diluent and reverse metamorphic process, the concentration of groundwater in other five layers increase in different degrees and evolve toward the concentrated sallification and forward metamorphic process. Finally, they all turn into the water of the deuterogenous sedimentary origin in different concentrations.