三肇凹陷长10区块扶余油层油运移机制及成藏模式
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摘要
利用297口曲线、5口岩芯和三维地震等资料对三肇凹陷长10区块扶余油层断层特征及活动期次、沉积微相和油水分布规律等成藏因素分析表明:T2断层具有平面密集成带、剖面"似花状"组合特征,油源断层多为受控于基底断层继承性活动的密集带边界断层;扶余油层发育西南保康物源控制下的河控三角洲沉积体系,且垂向上发育先水退后水进的沉积演化序列,水退最大期位于扶I组7-扶II2小层。长10区块扶余油层成藏模式为三肇凹陷青一段源岩生成的油在超压作用下通过油源断层向扶余油层倒灌运移,然后在浮力作用下沿着东北向的河道砂体匹配油源断层组成的优势输导通道(断层密集带)向长10区块远距离侧向运移,又由于凹陷阶地区断层密集带说明水构造反转作用多表现为"隆中堑"特征,整体处于构造高部位,因此油主要聚集在断层密集带上。
Through the analysis fault characteristics and movement period,sedimentary microfacies,oil-water distribution rule,which derived from 5 cores,297 well loggings and 3D-seismic,the conclusion is drawn that:T2 fault has the characteristics of dense belt in plane and "flower-like" in profile,and oil-source faults are border faults of dense belts,controlled by inherited movement of basement faults;the Fuyu reservoir develops fluvial-dominated delta controlled Southwest Baokang provenance,and the sedimentary evolution in vertical is from dereliction to flooding,the largest dereliction stage locate base of FI group-head of F II group.The Fuyu reservoir accumulation model in Chang 10 block is that oil generated from source rocks of qn1 member in Sanzhao depression flowing backward to Fuyang reservoir through oil faults under the overpressure,and then migrated laterally to Chang 10 through advantage transform pathways(fault dense belt)formed by matching between northeast channel sand and oil faults under buoyancy,because of fault intensive belt suffer tectonic inversion with the late Mingshui group and more performance for the "uplift interim graben" characteristics,overall at the structural high place,and thus,oil accumulate mainly in the fault belt.
Through the analysis fault characteristics and movement period,sedimentary microfacies,oil-water distribution rule,which derived from 5 cores,297 well loggings and 3D-seismic,the conclusion is drawn that:T2 fault has the characteristics of dense belt in plane and "flower-like" in profile,and oil-source faults are border faults of dense belts,controlled by inherited movement of basement faults;the Fuyu reservoir develops fluvial-dominated delta controlled Southwest Baokang provenance,and the sedimentary evolution in vertical is from dereliction to flooding,the largest dereliction stage locate base of FI group-head of F II group.The Fuyu reservoir accumulation model in Chang 10 block is that oil generated from source rocks of qn1 member in Sanzhao depression flowing backward to Fuyang reservoir through oil faults under the overpressure,and then migrated laterally to Chang 10 through advantage transform pathways(fault dense belt)formed by matching between northeast channel sand and oil faults under buoyancy,because of fault intensive belt suffer tectonic inversion with the late Mingshui group and more performance for the "uplift interim graben" characteristics,overall at the structural high place,and thus,oil accumulate mainly in the fault belt.
引文
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2蒋有录,谭丽娟,荣启宏,等.东营凹陷博兴地区油气成藏动力学与成藏模式.地质科学,2003;38(3):413—424
3赵文智,邹才能,汪泽成,等.富油气凹陷“满凹含油”论内涵与意义.石油勘探与开发,2004;31(2):5—13
4刘宗堡,付晓飞,吕延防,等.大型凹陷向斜区油气倒灌式成藏——以松辽盆地三肇凹陷扶杨油层为例.地质论评,2009;55(5):687—692
5李延平,陈树民,宋永忠,等.大庆长垣及以东泉三、四段扶杨油层浅水湖泊-三角洲体系沉积特征.大庆石油与开发,2005;24(5):13—16
6胡望水,吕炳全,张文军,等.松辽盆地构造演化及成盆动力学探讨.地质科学,2005;40(1):16—31
7罗群.断裂控烃理论与油气勘探实践.地球科学-中国地质大学学报,2002;27(6):751—756
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