利用地球化学、地层压力分析等手段,深入研究渤海南部莱西构造带新近系输导体系的特征、分布、时空配置关系及其有效性,进一步揭示莱西构造带油气成藏规律。分析莱西构造带新近系：断裂体系、输导层与盖层,油气输导格架3要素研究其特征与空间匹配关系并进行静态评价,发现除前人总结的馆陶组—明下段V油层组外,明下段Ⅰ—Ⅲ油层组也是新近系油气运移优势输导层。在调节断层分割与泥岩盖层分隔下,两个优势输导层重组并构成了莱西构造带新近系“千层糕”式油气输导格架。结合含氮化合物浓度、地层压力、荧光录井与砂体刻画对油气输导路径进行动态追踪与运移通道刻画,证实“T03-T02-T01泥岩盖层组”分隔新近系油气输导格架为上、下两套油气输导体系,后者输导通道以馆陶组—明下段Ⅴ油层组块状砂砾岩体为主,前者主要由明下段Ⅰ—Ⅲ油层组相互叠置连通的南北向河道型砂体构成,油气沿两个优势通道以横向输导为主,并伴有差异成藏现象。图10表3参19
Characteristics, distribution, temporal and spatial configuration, and effectiveness of hydrocarbon migration pathways have been investigated through geochemical and formation pressure analysis etc, to further reveal hydrocarbon accumulation patterns in the Neogene of the Laixi structural belt, southern Bohai Sea of China. Firstly, three factors, faults, carrier rocks (beds) and mud caprocks of the transporting framework in the Neogene were examined to find out its feature and space configuration and made static state evaluation. It is found that besides the Guantao Formation - lower Minghuazhen Formation No. V oil layers, the No. I - III oil layers in the lower Minghuazhen Formation are also the dominant oil and gas carrier beds. Cutted by the adjustment faults and sealed by mudstone capcocks, the two carrier layers are combined into a “layered cake” type hydrocarbon migration framework. Then the hydrocarbon passage pathways were tracked dynamically and described using nitrogen compounds concentration, formation pressure, fluorescence logging and sand bodies description, which shows that the “T03-T02-T01 mudstone cap layers” separate the Neogene hydrocarbon migration pathways into upper and lower units. The massive sandy conglomerate reservoirs in the Guantao Formation - lower Minghuazhen Formation No. V oil layers are the carrier bed of the lower hydrocarbon migration pathway, while the north-south trending overlapped and connected channel sandbodies in lower Minghuazhen Formation No. I - III oil layers are the carrier bed of the upper unit. Hydrocarbon migrated laterally along the two passage ways, accompanying with differential accumulation.
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