Study On Fluid Distribution And Rational Development Methods Of Low Permeability Reservoir In Wuerhe Baikouquan Formation

The low permeability reservoirs have characteristics with a large amount of oil resources,wide distribution and the broad development prospects.However,the low permeability reservoirs also have the features like low porosity,low permeability,complex pore structure,hard heterogeneity.As a result,reservoir fluid distribution gets complex.Therefore,researching the characteristics of reservoir fluid distribution is extremely considerable for feasible reservoir development.Taking Baikouquan formation in W5 well field of Wuerhe as an example,by collecting various relevant information of research area,and based on surveying a large number of documents about the methods about fluid distribution research,the main researches of the thesis can be summarized as follows:(1)This thesis analyzes the characteristics of reservoir,such as geographical position,reservoir structure,depositional environment,four properties characteristics,seepage characteristic,based on the reservoir geological data of the study area and confirms the Baikouquan reservoir's form.(2)After surveying and studying the methods of fluid qualitative identification and quantitative analysis of the degree of saturation,considering the data collected in the study area,audio judgement method,curve overlapping method and cross plot method are selected to identify the reservoir fluid while oil height method and the Archie method are selected to analyze the fluid saturation.(3)On the one hand,porosity-resistivity ratio of dual laterolog cross plot is constructed for the qualitative identification of reservoir fluid from qualitative analysis angle.On the other hand,from the quantitative angles,the oil height method is used to macroscopically analyze the characteristics of reservoir fluid distribution and ascertain the main layers of the study area with the features of fluid distribution.Then the Archie formula intersection chart based on the revised Archie formula is constructed for analyzing the fluid saturation.Then by analyzing the characteristic of the reservoir fluid saturation distribution and the reserve distribution,the difference between the distributions are analyzed and the affecting factors of reservoir fluid saturation distribution are analyzed subsequently.(4)By means of analyzing the current status of exploitation and the deliverability of the study area.According to the characteristics of fluid distribution and well productivity distribution,the study area is divided into four regions as east region,middle region,west region and south region and then the thesis analyzes the production effect factors.(5)On the basis of previous researches,the study area is divided into the developed area(the east region,middle region,west region)and the undeveloped area(the south region)to research rational development methods.The research rational development methods of developed area is demonstrated by ascertaining the rational method of the typical well field of different regions.As consequence,developing the developed area by dividing the area is more feasible.Finally,the well pattern is arranged with the characteristics of fluid distribution and has obtained favorable development effect.