【摘要】 对采自渤海湾盆地济阳坳陷孤南洼陷9口探井的220块下第三系储集岩标本进行了细致的天然剩磁强度测试,研究不同含油级别的碎屑储集岩天然剩磁强度响应规律,结果表明:岩性是控制天然剩磁强度的首要地质要素,含油标本的天然剩磁强度总体上略低于不含油标本,沉积剩磁是天然剩磁强度的主要贡献者,含油性对天然剩磁强度的控制作用不明显;在95%置信水平上,不含油标本和含油标本天然剩磁强度均服从对数正态分布,两者之间的差异不显著;烃类流体充注于碎屑储集岩的有效孔隙和渗流通道是含油气流体与储集岩相互作用的主要方式,烃类流体对碎屑储集岩的化学蚀变作用是次要的,与烃类流体运移聚集相关的自生磁铁矿作用并不具普遍性;孤南洼陷地面高精度磁测资料处理与解释,源自下第三系原位油气藏的磁异常信息可忽略不计.更多还原

【Abstract】 A total of 220 specimens were collected from the Cenozoic clastic reservoir rocks in Gunan sag for natural remanent magnetization(NRM)analysis and its relation to hydrocarbon saturation.The values of NRM are primarily controlled by the lithologic difference.NRM values of the oily samples are slightly lower than non-oily samples,the effect of hydrocarbon saturation upon NRM is not obvious,depositional remanent magnetization is the main contribution of NRM.It was found that the distribution of NRM for non-oily and oily samples are logarithmically normal at a significance level of p=0.05.The physically charging of hydrocarbon fluids into effective pores and permeable channels in the clastic reservoir rocks is the main interaction between hydrocarbon fluids and reservoir rocks.Chemical erosion of hydrocarbon fluids upon clastic reservoir is minor.Authigenic magnetite related to hydrocarbon fluids migration and accumulation is not widespread in the oily reservoir rocks.When the high precision ground magnetic data collected from Gunan sag is processed and interpreted,the magnetic anomaly derived from deep in-situ reservoirs can be ignored.更多还原