Integrated Log Interpretation Of The Reservoirs In Post-salt Strata In S District Of Pre-caspian Bain

There are many oil-gas structures,whose distribution is complicated,in S district of PreCaspian Bain.The main cement is calcareous or argillaceous and the vertical heterogeneity of reservoirs is also strong.The electrical curves are used to reflect the information of fluid,but,in this area because of the influences of lithology and mineralization,the results are not accurate.Meanwhile,there are many structural units in this area and in each unit the lower limit value of physical property,electrical property and oil-gas bearing property is different.So the lithology and fluid tapes cannot be identified accurately by adopting the same interpretation parameters and models.In this thesis,block A and T are the main objective blocks.Through the study on logging interpretation methods of Post-salt Strata,the author establishes a new logging evaluation system which significantly improves the accuracy of logging interpretation in this area.First of all,studying the formation mechanism,sedimentary faces,hydrocarbon migration and reservoir characteristics,and analyzing the log responses,the reservoir characteristics of different layers,oil-gas-water distribution by using the core and many log data.By using the cores data of Triassic sandstone reservoirs,the characteristics of lithology,physical property,electrical property and oil-gas bearing property can be analyzed more accurately.And studying the pore structure of high capacity reservoir by using the results of relative permeability analyzes.Also,the reason of invasion is studied by using the array induction data.Through the study of four properties ' relations and the combination of core microscopic features,the influences of size of rock to the characteristics of lithology,physical property,electrical property and oil-gas bearing property are clear.This study is the foundation of lithology and fluid identification.Using the mathematic methods to establish the computation model of shale content,porosity and permeability,which based on rock electrical parameters,core data,water analysis data,geologic logging and oil test data,.The author analyzes the carbonate content's influences,rock granularity and mud content on the porosity and permeability,key parameters of the evaluation model of formation water resistivity etc saturation are determined.Selecting the sensitivity logging curves based on the characteristics of invasion of array induction logging.Then using array induction ratio method to identify the fluid tapes and using the relationship between cores analyzes and logging curves to distinguish oil,gas and water and using cross-plots of porosity-resistivity-water saturation,P1/2 normal distribution,movable oil saturation,apparent formation water resistivity and so on to analyze the characteristics of fluid.Besides,the author optimizes the design of logging series and establishes a series of suitable log interpretation evaluation methods.By using these methods to recheck the previous logging interpretation results,the accuracy is improved significantly.And these results help researchers to realize the reservoir characteristics of Post-salt Strata in S District and improve exploration and development efficiency.