辽河坳陷齐家变质岩潜山内幕隔层特征与控藏作用

Characteristics and Reservoir Control Effect of Interior Barriers of Qijia Metamorphic Buried Hill in Liaohe Depression

以辽河坳陷齐家潜山为例,分析了变质岩潜山内幕隔层的电性及分布特征,并对油气的控制作用进行了综合研究。研究认为,齐家潜山内幕隔层主要为煌斑岩和斜长角闪岩,其常规测井特征表现为高密度、高中子伽马、高光电吸收截面指数和低自然伽马,成像测井中显示为煌斑岩和斜长角闪岩均具有裂缝相对不发育的特点;隔层分布具有多层状特点,将潜山分割为多个压力系统;隔层下部的裂缝发育带是油气运移的重要通道;将潜山地层中的油层、水层和干层分隔为油层-干层-水层型、干层-油水层型和气层-油层型等多种油水分布模式,类似兴隆台潜山兴古7井的油-油层型分布模式成为下一步勘探的目标。

Taking the Qijia buried hill in Liaohe depression as an example,the electric property and distribution characteristics of interior barriers in the metamorphic buried hills are analyzed,and the controlling effects of the interior barriers on hydrocarbon are comprehensively studied.The results show that the lithology of the interior barriers is mainly composed of lamprophyre and plagioclase amphibolite which behave high density,high neutron gamma,high photoelectric absorption section index as well as low natural gamma ray in conventional logging;imaging logging shows relative less fissures in lamprophyre and plagioclase amphibolite;the multi-tier distributed interior barriers divides the buried hill into numerous pressure systems,serving as important part of the traps in it,which confine the migration direction of hydrocarbon and fracture-developed zone in the lower part was the significant channel for oil and gas migration.Also,the interior barriers separated oil layers,water layers and dry layers into various hydrocarbon-water distribution models such as oil-dry-water type,dry-oil and water type and gas-oil type,etc;the oil-oil layer type distribution mode similar to Xinggu-7 Well of Xinglongtai buried-hill becomes the next exploration target.