针对轮南地区奥陶系裂缝型储层埋藏深、构造形成期多、影响因素多、后期改造作用复杂等特点 ,采用数理统计、应力场数值模拟、岩石力学性质与构造、沉积、钻井资料相结合分析等方法 ,确定出该区裂隙形成时期及相互关系 ,并预测了各期裂缝、综合裂缝和有效裂缝的分布 .结果表明 ,轮南奥陶系裂缝主要形成于晚海西 -印支期 ,裂缝走向有SN ,NW ,NWW和EW向 4组 ,其中以NW ,NWW向为主 ;裂缝发育区主要位于桑塔木断垒带 ,其次为轮南断垒带东段、中部斜坡区的东部、LN1～LN11井区及LN8～LN12～LN18井区 Aiming at the characteristics of buried Ordovician fractured reservoirs in Lunnan area, many tectonic periods, many influencing factors and complex retrofitting effects, mathematical statistics, numerical simulation of stress field, mechanical properties and structure of rocks, sedimentary and drilling data Combined with analysis and other methods to determine the formation of cracks in the region and the relationship between the cracks and predict the distribution of cracks, synthetic fractures and effective fractures.The results show that Lunnan Ordovician fractures formed mainly in the late Hercynian - Indosinian The cracks are dominated by SN, NW, NWW and EW to 4 groups, of which the NW and NWW directions are dominant. The fractures are mainly located in the Santam fault zone, followed by the eastern section of the Lunnan fault zone, East, LN1 ~ LN11 well area and LN8 ~ LN12 ~ LN18 well area