【摘要】 三肇凹陷扶杨油层为典型大型凹陷向斜区油气倒灌式成藏,利用300条地震剖面、825口井曲线、11口井岩芯和探评井试油资料对扶杨油层断层特征及运动期次、油气下排深度、储层沉积特征等油气成藏主控因素综合研究表明:T2断层受控于基底断层、下部火山口、斜向拉张和伸展量差异四种因素具有平面密集成带、剖面"似花状"组合特征,且油气成藏期活动的油源断层多数为断层密集带边界断层;理论计算超压驱动油气下排深度和实际油底包络面统计扶杨油层含油厚度约为200m;重矿物分析扶杨油层主要受北部拜泉—青冈和西南保康物源影响,两物源在徐家围子地区交汇后向东流出;沉积微相揭示扶杨油层发育向上逐渐退积的河控浅水三角洲沉积体系,顶部为三角洲前缘亚相,中—下部为三角洲分流平原亚相,其中扶Ⅰ7—扶Ⅱ1小层为水退最大期,是油气富集主要层位。明水组末期青山口组源岩达到生油高峰,油气在超压作用下沿开启的断层密集带边界断层幕式下排后沿两侧上升盘河道砂体做短距离侧向运移,即断层密集带两侧地垒或断阶块为油气富集区,而断层密集带内多为地堑式组合,不利于油气聚集,在成藏模式指导下刻画出47个油气富集目标区,为松辽盆地北部扶杨油层下一步的勘探与开发指明了方向。更多还原

【Abstract】 The Fuyang reservoir of the Sanzhao depression in the Songliao Basin is a typical large-depression reserved-migration accumulation.300 seismic sections,log curves of 825 wells,11 well-cores and exploratory well testing data were applied to do some composite study on the features and moving periods of faults,hydrocarbon down-migration depth,reservoir depositional characteristics and so on, the main factors controlling hydrocarbon accumulation. They are concluded that: (1) T2 faults are controlled by basement fault,lower craters,difference between the amount of oblique tension and extension,having the association characteristics of concentrated into ribbons in plane,"flower-like" combination in section. And the oil sources faults that are active at the hydrocarbon accumulation period are mainly boundary faults of concentrated ribbons. (2) Theoretical calculations of down-migration depth driven by overpressure and the statistics on the practical oil pan envelope suggest that the thickness bearing oil in the Fuyang reservoir is 200m. (3) Heavy mineral analysis that the Fuyang reservoir are mainly affected by the northern Baiquan—Qinggang source and the southwest Baokang source.And the two source meet in the region of Xujiaweizi then flow to the east. (4) Sedimentary microfacies reveal that the Fuyang reservoir grow gradually retrogradation shallow delta depositional system.The top is delta front facies,and the middle and bottom is delta distributary plain facies. The development period of FⅠ7—FⅡ1 is the largest period of region water regression,which are the main enrichment horizon. At the end of the Mingshui Group,the Qingshankou source rocks reach oil generation peak,hydrocarbon migration episodic pass down to along open boundary faults of concentrated ribbons,and crossrange migration for short distance along distributary river sand on uplifted side of the both side.That is,horst and fault horst that located with both sides of the fault concentrated ribbons are hydrocarbon concentrate region,the concentrated ribbons are always combinative graben which is not good for accumulation.At the guidance of the accumulation model,47 hydrocarbon-riched target area were depicted,which gave a clear direction in the exploration and development for the Fuyang in the Songliao basin.更多还原