Fine. Nanyishan Shallow Reservoir Logging Parameters Evaluated

Nanyishan shallow reservoir structure movement due to the impact of the Himalayan region and the faults are well developed, which resulted in the distribution of water and oil complicated, and by the sedimentary environment, its deposition of phase change fast and thin, and the sand extended in a small range, the lithology is multiplex. The heterogeneity is strong, the physical property is poor, the power is weak, combined with logging data types and more non-uniform scale are different, and it's difficilt to establish the standards of typical four natural relationship and effective thickness, reservoir identification is more difficult, the consistent of interpretation results rate and precision of reserve calculation are low. So it's urgently needed to explain the formation with detailed research and improve the calculation of reserves. Therefore, to these problems, the research is focusing on the following five aspects:(1) The standardization of different series logging data, calibration and reservoir layer between four natural relationship, the analysis of logging response characteristics in water layer, oil-water layer, dry layer, and to determine the lower of four natural relationship.(2) Establish the oil reservoir permeability, clay content, porosity and oil saturation parameter model in sub-group.(3) Using gray connection analysis to establish the standard of effective identification and thickness based on laboratory analysis, single production and oil test data, and the stratified log interpretation in work area.(4) Draw oil-water relationship profile based on fine logging interpretation conclusions, identify the main producing formation, which to amend and improve logging interpretation.(5) According to sub-vertical distribution of water and good lateral stability, the reservoir is divided into 10 vertical unit to calculate the reservoir storage.Through this research, establish a detailed reservoir parameters and log interpretation model, draw oil-water relationship profile, the way to well logging fine interpretation and reserve calculation in Nanyishan shallow reservoir is formed. Compare with the 315 wells' conclusions of interpretation and oil test data, the compliance rate is 85% which can improve the accuracy of calculation of reserves.The research about fine interpretation of well logging and reservoir storage calculations have greater valueable promotion in Nanyishan shallow and other similar reservoir.