麦盖提斜坡东段断裂活动特征及油气意义

麦盖提斜坡断裂活动与油气运聚关系密切。结合钻井信息，解析了斜坡东段玛东冲断带和玛扎塔格等断裂活动特征，明确了断裂活动样式和形成期次，讨论了断裂活动与油气成藏的关系。研究认为，斜坡东段发育早加里东、晚加里东、晚海西期和喜马拉雅期断裂，具有多期活动的特征。玛扎塔格断裂形成于早加里东期，定型于喜马拉雅期，构造样式由滑脱背斜转为基底卷入背斜，与西侧的鸟山断裂为同一条断裂，喜马拉雅晚期与古董山断裂连为一体，南北向展布的玛南1井断裂为调节断裂；玛东冲断带形成于中加里东中期，定型于晚加里东期，构造样式为滑脱背斜，其与西南部发育的玉北1井断裂、胜和断裂同期形成，后者定型于晚海西期。勘探证实，已发现油气藏与晚海西期和喜马拉雅期定型构造圈闭有关，晚海西期定型构造含油，喜马拉雅期定型构造含气。

Fault activity characteristics in Maigaiti eastern slope and its hydrocarbon significance

Faults in the eastern Maigaiti slope have a close relationship with oil gas migration and accumulation of Cambrian and Ordovician.Based on the information from well data,we first analyze characteristics of fault activity in Madong thrust belt and Mazhatage faults.Then we discuss the relationship between faults and hydrocarbon accumulation by determining those fault activity pattern and formation stage.Our research results suggest that the study area have developed multi-period fault activities such as early Caledonian,late Cale-donian,late Hercynian,and Himalayan.Mazhatage faults were formed in early Caledonian and finalized in the Himalayan period.Their structural style turned into basement involved anticline from detachment anticline.Mazhatage fault and Niaoshan fault were in the same fault belt,and were split into two different faults in the late Himalayan period and then integrated with the Gudongshan fault.Well Manan 1 fault was regulation fracture along north and south direction located in the middle of Mazhatage fault and Niaoshan fault.Madong thrust belt whose structural style is detachment anticline was formed in middle Caledonian and finalized in late Caledonian.Shenghe fault and Well Yubei 1 fault were formed in the same period with Madong thrust belt,which finalized in the late Hercynian.The hydrocarbon discoveries confirm that oil and gas reservoirs are structural traps finalized in the late Hercynian and Himalayan period.Oil reservoirs found in Well Yubei 1 fault were formed in late Hercynian,and gas reservoirs found in Niaoshan fault and Mazhatage fault zone were formed in Himalayan period.