【摘要】 大庆长垣南部构造两翼葡萄花油层油气资源丰富,但油水分布复杂、油气聚集成藏规律认识不清,导致两翼油气资源探明率低、探明储量动用效果差。利用测井、地震、试油和地球化学分析数据,在系统油源对比基础上,结合断裂系统划分标定油源断裂,分析断裂与砂体配置关系对油气运移、聚集的控制,建立成藏模式。研究得出,大庆长垣南部葡萄花油层油主要来自于本地下伏青一段源岩,主要排烃期为明水组沉积末期及其后,因此,坳陷期形成、反转期继续活动的断层以及断陷期形成、坳陷期和反转期继续活动的断裂为主要油源断裂,油气沿油源断裂垂向运移至葡萄花油层,受砂体规模及断层侧向封闭性限制,油气在葡萄花油层中侧向运移距离较短;油源断裂为主要控藏断裂,宏观控制葡萄花油层油水平面分布,油源断裂与砂体空间配置控制着油气聚集层位及范围;油源断裂下盘、反向断阶、单斜式地垒和顺向断阶等高位断块为两翼有利油气聚集部位。更多还原

【Abstract】 Putaohua reservoir is rich in oil and gas resources in the two wings of the South of Daqing Placanticline.The discovery rate of resources was low and proved reserves producing effect was poor in the two wings,because of complex oil/water distribution and inadequate understanding oil and gas accumulation pattern.Based on the detail oil-source correlation,through marking the oil-migrating faults with faults classification and analyzing the control of the allocation of faults and sand bodies to hydrocarbon migration and accumulation,the pattern of reservoirs forming is established in this paper.It’s considered that the oil of Putaohua reservoir mainly comes from the local hydrocarbon source rock of K1qn1,and the key period of hydrocarbon expulsion is the late sediment stage of K2m and later.Consequently,the main oil-migrating faults are composed of two types:(1)faults forming in depression period and faulting in inversion period;(2)faults forming in faulted period and faulting in depression period and inversion period.The oil vertical migration to Putaohua reservoir happened along the oil-migration faults,and the distance of oil lateral migration was short because of the restriction of sand bodies scales and fault lateral sealing.Thus,the oil-migrating faults are main control faults of the reservoir,which control the oil/water distribution at plane,and the allocation of the oil-migrating faults and sand bodies controls the horizon and range of oil accumulation.The favorable area of hydrocarbon accumulation is high fault blocks next to the oil-migrating faults,including the footwall of oil-migrating faults,inversed fault terrace,monoclinic horst,and forward fault terrace.更多还原