Abstract:There are more than 100 wells that good oil-gas shows have been found in shale formation in Jiyang depression,among which the commercial oil or the commercial oil with high production have been found in more than 10 wells in Hekou area.These fractured oil-gas reservoirs in shale generally distribute in lower formation of Es3 section,forming a belt zone.The reservoirs are mainly self-source and self-reserve.There is rich in calcium and sandy in shale formation.Aimed at the geologic feature of the region and the advantage of multi-wave exploration,eight 2-D lines of multi-wave exploration have been planned and operated,among which 4 lines are for east-west direction and other 4 lines are for north-south direction.The VP and VS velocity model for each line has been built,from which the stack sections of P-wave,converted wave and corresponding parameter sections are obtained.Oil-bearing fractured shale of targets show the basic feature that interval velocity of P-wave sharply decreases while that of converted wave is nearly unchanged.AVA inversion and inversive results of fractured parameters basical1y coincide with geologic structure of targets,especially the fractured parameters obtained from separating fast and slow S-wave correctly reflect the anisotropic information of fractured shale,predicted major developed direction of fractured shale is basically consistent with the direction of fracture or fault provided by drilling results and predicted fracture-developed degree has good oped consistent relation with well production rate.The distribution of fractured-shale-developed zone has the feature of northeast orientation,providing the basis of macro guide for defining well site in future.