Three facies models are proposed to c!lassify the known variations in fan delta depomts in oil— bearing lacustrine basins．These include models for transgressive，regressive，and Gilbert-type fan deltas．Transgressive fan deltas generally Occur in the stage of transgression．They often have bet— ter developed fining-upward sequences and can be dividi'ed into three major zones：proximal fan， mj'dfan，and distal fan．Regressive fan dekas generally develop in the stage of regression．These fan dekas often have well developed coarsening-upward sequences and are divisible into three ma- jor geomorphic zones：fan delta plain，fan delta front，and prodelta．The ideal Gilbert—type fan deka consists of topset，foreset，and bottomset beds．The overall coarsening-upward sequence may always be well developed．The principal characteristic that differentiates Gilbert—type fan deltas from the other models is the presence of hrge-scale graveHy foreset beds in the：shallow subaque-ouS Zone．