松辽盆地南部孤店断层活动性分析及其控藏作用

Analysis of the activity and its role in controlling reservoir accumulation of Gudian fault of southern Songliao Basin

通过去压实校正使地层厚度恢复到沉积时期的厚度,根据地层古厚度计算孤店断层反转前不同时期的生长指数,利用反转率法衡量孤店断层反转过程中不同部位活动的强弱.在研究孤店断层活动规律的基础上,分析孤店断层活动对研究区扶余油层成藏的控制作用.研究表明,营城组沉积时期孤店断层活动性较强,至泉头组沉积时期其活动性逐渐降低,嫩江组沉积末期孤店断层发生反转.明水组沉积末期的断层反转活动对嫩江组沉积末期运移并成藏的油气有破坏作用,油气成藏取决于孤店断层的反转强度及孤店断层的侧向封闭性.活动强度小的断层末端受到的破坏程度较小、断层侧向封闭性较好,对油气的保存有积极作用,为井位部署的有利区.

Through the strata decompression correction to recover the thickness of sedimentary strata,according to the ancient strata to calculate growth index of Gudian fault in different periods before inversion,using the inversion rate method to measure the activity of Gudian fault in different parts.Based on the analysis of fault activity,we analyzed the control action of Gudian on Fuyu oil layer in the study area.Studies have shown that,during the deposition of Yingcheng,Gudian fault activity is strong.During the deposition of Quantou,its activity is decreasing.Gudian fault reversed at the late of deposition of Nenjiang.Activities broke at the late of Sedimentary Mingshui play a destructive role in oil and gas which migrated and accumulated in the late of Nenjiang.Whether the oil can be preserved depended on the activity-intensity and lateral fault sealing.The activity intensity of the end of the fault damage to a lesser extent,lateral fault sealing better,can play an active role in the preservation of oil and gas,and these are favorable areas for the welling.This study will be of aa important guiding significance for the next oil and gas development and deployment in this area.