Abstract: By using theory of grey systen1,detailed evaluation of well log data fromn over 30 wrlls in Dongsalnduan reservoir, Hainan structural belt in Liaohe oilfield was made and brought into practice. And from characteristic values of the statistical analysis, their accuracy and resolution factor, this paptr providrd a stries of detailed evaluating paranelers, criteria、weight coefficients and software systems for fair reservoir rocks (Class I and I[) and pour ones (Class I) inl petrophysical property and petroliferous nature in this study ared, including c'oresponding well log paramneters dnd cal(ulation and evaluation of Class I to IN reservoirs and pay zunes. Cornpared with well lest data andl geologic informatioll fro) corresponding intervals,it is indicaled that these evaluation and interpretatiot rosuls have properly anl reliably 1flected the distributions and characlers of main hydrocarbon slrala, thus providing relevan; geologi basis for furher petroleum exploration and development in this structural belt.

Key words: Liaohe oilfield. Reservoir、 Evaluatior. Feature, Parameter, Standard