The Research On Logging Evaluation Method Of Chang7 Tight Sandstone Reservoirs In Huanjiang Area

Huanjiang area is located in the western of Ordos Basin, the main development area ofhuanjiang oilfield. Along with the increase of the construction task of producing and oilfield development in recent years, the chang7 reservoir in Huanjiang area are drilling in the oil well point continuously, showing great rolling development potential. Based on this carried out logging interpretation of chang7 density of reservoir in huanjiang area,lays a solid foundation for later potential reservoir development.The paper research the Chang7 dense sand of reservoir in Huanjiang area in the Ordos Basin,comprehensive utilize of logging data?core analysis data?, oil testing dynamic information combining with Chang7 reservoir sedimentary background and formation characteristics, analyze reservoir physical or anisotropy characteristics and its influencing factors, through four sexual relationships, establish the logging interpretation model, develop secondary interpretation processing and judge the tight oil reservoir. The definite conclusions are as follows:(1)The main sedimentary fades types of chang7 reservoir in Huanjiang area is delta front fades and turbidite fan facies, reservoir particles is small,main developing the pink and fine sandstone. The reservoir property and permeability is small,conventional logging precision and resolution is low. It’s difficult to find effective reservoir.(2)Through four sexual relationships, determine the corresponding characteristics of oil-water layer logging?precise establish shale content, porosity, permeability and saturation interpretation model, apply experience statistics, capacity analysis and so on, comprehensive analysis to determine the lower limit of reservoir physical property: porosity is 6,0%, permeability is 0.03 x 10’3fxm2.(3) According to the Chang7 dense sand of reservoir formation characteristics, accumulation pattern and oil test data, the application of reservoir parameters threshold value method to determine the dense oil reservoir electrical standards, combined with the feature of curve method, TPI index method and transverse comparison method. ABSTRACT comprehensive correlation and analysisof the methods?in order to improve the interpretation coincidence rate, and is verified by oil test results, obtained good effect in practical application.