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对采自渤海湾盆地济阳坳陷孤南洼陷4口探井的22块古近系沙河街组碎屑储集岩标本进行了细致的磁化率-温度曲线、三轴饱和等温剩磁热退磁测试,研究不同含油级别的储集岩的热磁特征与磁性载体,结果表明:孤南洼陷沙河街组储集岩磁性矿物及其组合可以划分为3种类型:磁铁矿、针铁矿+磁黄铁矿+磁铁矿、赤铁矿+磁铁矿,岩石的磁性载体及其组合与岩石的颜色、岩性等沉积学特征密切相关,而与含油性关系不明显;在氩气环境中加热,含油标本中的磁铁矿Hopkinson峰低而宽,甚至不明显,居里温度附近曲线多呈锯齿状,冷却过程中,磁铁矿重现作用不明显,烃类有机质对碎屑储集岩中沉积成因磁铁矿的热磁行为具有一定的控制作用;烃类流体侵位,储集岩中的磁性矿物及其组合未发生明显变化,亦不存在某种演化序列或规律性,烃类流体化学重磁化不具普遍性。
Twenty-two Paleogene clastic reservoirs collected from 4 exploration wells in the Gunnan Sag of the Jiyang Depression in the Bohai Bay Basin have been subjected to detailed susceptibility-temperature curves, triaxial saturation isothermal magnetocaloric demagnetization The results show that the magnetic minerals and their assemblages in the Shahejie Formation reservoir in Gunnan Sag can be divided into three types: magnetite, goethite + Pyrrhotite + magnetite, hematite + magnetite, magnetic carrier of rock and its combination are closely related to sedimentary characteristics such as color and lithology of rock, but have little relationship with oil content. In argon In the environment, the Hopkinson peak of the magnetite in the oil-bearing samples is low and wide, or even not obvious. The curves near the Curie temperature are mostly serrated. In the cooling process, the magnetite reappears little, and the hydrocarbon organic matter acts on the debris The thermal magnetic behavior of sedimentary-formed magnetite in reservoir rocks has a certain controlling effect. There is no obvious change in the occurrence of hydrocarbon fluid emplacement, magnetic minerals and their combination in reservoir rocks, and there is no certain sequence of evolution or regularity Chemical re-magnetization of hydrocarbon fluids is not universal.