关键词: 致密砂岩, 储层物性, 沉积作用, 成岩作用, 辽河凹陷

Abstract:

Both the organic genesis theory and inorganic genesis theory on the formation of oil and gas have their own evidences, but any one always has some phenomena not to be satisfactorily explained. In the study of the genesis of oil and gas, the theory of water phase transition controlling hydrothermal mineralization may give a better explanation, or at least provide some new ideas. According to the theory of water phase transitions controlling the formation of oil and gas, the generation and migration of oil and gas are always mixed with water together, even the hydrocarbon is as a special hydrothermal mineral. Under a closed system in the crust, according to the upper crust hydrothermal geothermal lines, the fluid mixed hydrocarbon with water is the liquid phase. But when pressure reduction caused by the fault or fold, the fluid system will take place the separation of water and hydrocarbon, and result in the formation of oil and gas reservoirs. Bases the theory, this paper analyzed the phenomena related with hydrothermal mineralization in the formation of oil and gas. With the laws of water phase transitions in the lithosphere, this paper also explained briefly the geneses oneness of the formation of oil and gas, hydrothermal metal ore-deposit, the low velocity-high conductivity layer, the earth degassing and the earthquakes.

Key words: tight sandstone, reservoir properties, sedimentation, diagenesis, Liaohe Depression