Study On Fluid History Of Petroleum Hydrodynamic System And Its Geological Meaning In The Tuha Basin

The Tuha basin, which evolvement of conformation is periods of time, is a extrusion petroleum basin. Complicated geological condition form models of oil-gas pool. Along with the continual elevation of prospecting, especially the increasing of cognition for basin evolvement and data getting, it is very important for enough study on petroleum migration-accumulation and fluid dynamic system.This dissertation makes use of all data which would be gained, such as tectonics, sedimentation and stratum, etc., using new theories and methods of fluid history and pool analysis for petroleum basin, petroleum hydrodynamic system, fluid chemistry, etc., considering dynamics and evolution, and systemic studies the dynamic process of petroleum creating, migration and accumulation, and analyzing the rules.At the same time, by integrative analyzing of petroleum fluid system in the Tuha basin, we research the fluid properties of the Jurassic petroleum hydrodynamic system in the Taibei depression.There are main conclusions and views as follow:1. There are three hydrodynamic systems in the Taibei depression: Shengbei, Qiudong and Xiaocaohu. And in which the Jurassic is main.2. With the basin evolution, affected by many geological factors, the ground fluid chemistry field is character of vertical zonation and planar division at the Jurassic hydrodynamic system in the Taibei depression, which is mainly controlled by hydrodynamics and the origin and evolution of ground water.3. In the Taibei depression, the dynamic property of the Jurassic stratum is typical, the inner is high, the outer is low, and is ringed. The press property is same as the potential, there are superpressure at Qiketai stratum.4. For the Taibei depression, the hydrodynamics in the Jurassic reservoir is characterized by asymmetry.5. Three local hydrodynamic units can be distinguished in the Taibei depression: (1)centrifugal flow caused by mudstone compaction at the depression area, such as the inner of Shengbei depression, Qiudong depression and Xiaocaohu depression; (2) gravity-induced centripetal flow recharged by meteoric water at the basin edge generally, for instance, the Huoyanshan area, the northern of depression; (3) discharged area by cross-formational flow, or cross-formational flow-evaporation.6. In every hydrodynamic system, the migration and distributing of petroleum is very correlated with the formation and evolution of the hydrodynamic field. For hydrodynamic force, the oil-gas would migrate at vertical and lateral, and accumulate at suit traps. At the same time, for hydrogeology gyrations, petroleum would periodicmigrate and ringed distribute.Therefore, ground fluid is at different hydrodynamic systems. Alonge with the basin evolution, the fluids are too, and present different hydrodynamic properties at different areas in basin. Its studies are very important for farther prospecting.