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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.
The natural remnant magnetic field intensity of 220 reservoirs collected from 9 exploration wells in 9 wells of Gunnan depression in the Jiyang depression of Bohai Bay Basin was studied. The natural residuals of clastic reservoirs with different oil levels The results show that lithology is the primary geologic element controlling the natural remanence. The natural remanence of oil - bearing samples is generally lower than that of the non - oil - bearing samples. The depositional remanence is the main contributor to the natural remanence. The control effect of oil content on natural remanence was not obvious. At 95% confidence level, the natural remanence of oil-free and oil-content samples obeyed the logarithm normal distribution, and the difference was not significant. The hydrocarbon fluid Effective pores and seepage channels filled with clastic reservoirs are the main ways for oil-bearing fluids to interact with the reservoirs. Hydrocarbon fluids are secondary to the chemical alteration of clastic reservoirs, The role of authigenic magnetite associated with fluid migration and accumulation is not universal. The processing and interpretation of high-precision magnetic data on the surface of Guonan depression is negligible. The magnetic anomalies originating from the reservoirs in the Lower Tertiary are negligible.