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以泥岩压实、埋藏史及生烃特征为主要依据，分析了鄂尔多斯盆地三迭系延长组长７油层组烃源岩油气初次运移的动力、产生深度、运移时间、运移方向及途径。结果表明，本区油气初次运移的主要动力是长７油层组广大范围发育的泥岩欠压实现象所产生的高过剩压力，烃源岩门限深度及异常压实起始深度决定了本区烃源岩初次运移的深度，油气初次运移的时期主要发生于Ｋ１２时期和Ｋ１３时期，油气直接从烃源岩垂向进入邻近储集层将是本区最为重要的运移途径之一，烃源岩侧向发生相变的地带往往也可以形成比较良好的排烃条件
Based on the compaction and burial history of mudstone and the characteristics of hydrocarbon generation, the motive force, depth, migration time, migration direction and ways of primary migration of hydrocarbon source rocks in Chang7 oil layer of Triassic Yanchang Formation in Ordos Basin are analyzed. The results show that the main source of hydrocarbon migration is the high overpressure caused by the underdepression of mudstone in a wide range of Chang 7 reservoir. The threshold depth of source rock and the initial depth of abnormal compaction determine the hydrocarbon The depth of initial migration of source rock and the period of primary migration of oil and gas mainly occur in K12 and K13 periods. Hydrocarbons directly entering the adjacent reservoirs directly from source rocks will be one of the most important migration routes in this area. Hydrocarbon sources Lateral rock phase transition zone can often form a relatively good hydrocarbon drainage conditions