Paleo-fluid Pressure Restored By Ways Of Fluid Inclusions The Rmodynamics And Numerical Simulation And Its Effects OnHydrocarbon Accumulation In

The oil and gas migration and accumulation be affected by fluid dynamics,and which is a key problem discussed in basin fluid research.Many domestic and international scholars inquire lots of methods about paleo fluid pressure recovery,such as basin modelling,salinity-homogenization temperature metod,thermodynamic simulation,isochore map solution.However,complexity geological background and tectonism possibly lead to false paleo fluid pressure obtained by single method.So we renewal the paleo-pressure through a variety of methods,verifing the results in order to obtain accurate paleo fluid pressure.Hutubi-Fukang region located in southern Junggar basin,which is a superimposed basins formed in different periods,and overpressure widely developed in Ziniquan formation and Toutunhe formation.Ziniquan and Toutunhe formations were divided into iron stain argillaceous coated-anhydrite-analcime cementation-calcite cementation-quartz dissolution-feldspar increase-analcime dissolution-calcite dissolution-feldspar dissolution-Quartz secondary enlargement,compaction-clay mineral growth-secondary enlargement of quartz-calcite,zeolite cementation-feldspar dissolution.The inclusion type is single and the charging stage is complex.The Ziniquan formation can be divided into three phases and Toutunhe formation two phases.The salinity-homogenization temperature metod results show that,the paleo fluid pressure of Ziniquan formation is 37.71 MPa when yellow fluorescence oil charged,and the paleo fluid pressure is 115.78 MPa when blue fluorescence oil charged,and the paleo fluid pressure of Toutunhe formation is 127.64 MPa when blue fluorescence oil charged.The isochore map solution results show that the paleo fluid pressure of Ziniquan formation is 24.03 MPa when yellow fluorescence oil charged,and the paleo fluid pressure is 43.81 MPa when blue fluorescence oil charged,and the paleo fluid pressure of Toutunhe formation is 55.18 MPa when blue fluorescence oil charged.Analyzing of fluid pressure evolution in Changshan 1 well by basin modeling,we obtain the the paleo fluid pressure of Toutunhe formation is about 120 MPa through the tectonic stress correction when blue fluorescence oil charged.According to the comprehensive analysis and comparison of the data,it reveals that isochore map solution has obvious deviation.Therefore,we use the data of homogenization temperature salinity recovery for Fukang Hutubi area oil and gas accumulation analysis.According to the time of oil and gas charged,it is considered that the overpressure of Ziniquan formation was 4MPa in Miocene(13Ma).The overpressure rapidly increased in Pliocene(3.6Ma),it was 67 MPa of Ziniquan formation and 74 MPa of Toutunhe formation.The difference of overpressure between source rocks and Toutunhe formation,Ziniquan formation were 8MPa and 15 MPa,higher than the effective discharge pressure.So it can provide power for oil and gas migration.And we put forward that the hydrocarbon accumulation model in Hutubi-Fukang region is that oil and gas driven by overpressure migrate along the fault in Pliocene.