TX 75083-3B36, U. S.A., fax 01-972-952-9435. Abstract Identification and distribution of natural fractures are important in development of oil and gas fields. On the basis of detailed observation and description of core fractures and their comparison with advanced imaging well-logging fractures, natural fractures can be distinguished from induced fractures. Due to conventional well-logging responses to the high conductivity of fractures, all kinds of fractures may be recognized. Lithology and lithologic association control on the distribution and behavior of natural fractures under concurrent structural settings, natural fracture distribution is indirectly predicted by searching for lithologic combination, which is implemented by seismic inversion under the control of welllogging quality. In addition, fracture distribution is forecasted by extracting fracture information from compressional wave data after excluding Iithologic factor.