Determination Of Permeability And Specific Surface Area Of The Pore Channels From Well Logs In Fine Grained Sandstone Available to Purchase

Permeability and specific surface area of pore channels are important parameters of sandstones in controlling production strategy of oil and gas fields particularly when secondary recovery procedures are concerned. Numerical values of permeability, k, and specific surface area, So, show broad changes in fine grained shaly and silty sandstones. Modern interpreting techniques of well logs offer good chances for continuous evaluation of k and So along the borehole axis. This gives a great help for reservoir engineering in solving practical problems, since laboratory measurements of k and So on rock samples are significantly influenced by deviations from in situ conditions, moreover laboratory measurements of So cannot be considered as being perfectly solved. Special interpreting procedures have been elaborated at the Hungarian Oil and Gas Trust for determining k and So from well logs. The basic well logging parameter in this respect is the "lithologic influence factor", C, describing the electric conductance of pore surfaces related to the same of the pore space, filled up with water. Besides irreducible water saturation, Swi, porosity, phi, and formation resistivity factor, F, are also utilized for determining k and So.